# VGRID POWER — full content 135 kW PCS, 200 kW PV DC/DC, 250/375/500 kW hybrid cabinets and a 750 kW-class split system for solar-storage microgrids. See MW-scale parallel options. Contact: +8615813856556 --- # Scenario Solutions Scenario Solutions # Rack-mounted equipment VGRID POWER: Rack-mounted equipment, rack-mounted microgrid energy storage PCS, MPPT, STS, hybrid inverter VGRID POWER: Rack-mounted equipment, rack-mounted microgrid energy storage PCS, MPPT, STS, hybrid inverter # Wall-mounted Power Conversion System VGRID LEONA-H135K wall-mounted microgrid PCS with the LEONA-M200K 200 kW PV MPPT controller for PV-storage, PV-storage-diesel and DC-coupled designs. VGRID POWER - Wall-mounted PCS LEONA-H135K, external 200 kW MPPT LEONA-M200K # Wall-mounted Hybrid PCS The VGRID POWER wall-mounted Hybrid PCS is a highly efficient, highly reliable, high-protection wall-mounted hybrid grid converter developed for small and medium-sized microgrids. It integrates PCS, EMS, STS and ATS in one unit, supports parallel operation of more than 20 units in off-grid mode, supports hybrid operation with diesel generators, reserves PV connection ports, and supports application scenarios such as DC coupling, AC coupling, PV-storage-charging, and diesel-storage. ## LEONA-H135K 135 kW Wall-Mounted Microgrid PCS - SKU: LEONA-H135K - MOQ: 1 set - URL: https://www.vgridpower.cn/en/product/leona-h135k ### Summary LEONA-H135K is a split-architecture, IP65 wall-mounted microgrid PCS for battery systems. The brochure specifies 135 kVA rated off-grid output and describes PV, battery, grid and generator integration, with optional PV MPPT equipment. ### Key features - Split-architecture wall-mounted microgrid PCS - IP65 enclosure; 98.1% maximum efficiency - 135 kVA rated off-grid output; 148.5 kVA maximum output per brochure - Grid-forming PQ / VF / droop / VSG control modes - Supports PV-storage-diesel and AC/DC-coupled project concepts - Parallel battery configurations with project-specific engineering ### Specifications - Model: LEONA-H135K - Battery voltage range: 600–950 V - Maximum battery current: 255 A - Rated off-grid output: 135 kVA - Maximum output: 148.5 kVA - Maximum output current: 216 A - Rated AC voltage: 400/230 V - Grid voltage range: −20% to +15% - Grid frequency: 50 Hz (47–52 Hz) or 60 Hz (57–62 Hz) - Current THD: <3% at load >30% - Load unbalance: 100% - Overload capability: 1.1× continuous / 1.25× for 60 s / 1.5× for 100 ms (below 35°C) - Installation: Wall-mounted, split architecture - Maximum efficiency: 98.1% - Protection rating: IP65 - Dimensions (W×L×H): 770×970×362 mm - Weight: Approx. 85 kg (converter) - Operating temperature: −30 to 60°C; derating above 45°C - Humidity: 5–95% - Cooling: Intelligent air cooling - Maximum altitude: 4000 m; derating above 2000 m LEONA-H135K is a wall-mounted, split-architecture energy storage PCS designed for commercial and industrial microgrids. Its independently arranged equipment supports service access, while the IP65 enclosure suits demanding installation environments. The brochure lists 135 kVA rated off-grid output, up to 148.5 kVA maximum output and 98.1% maximum efficiency. Product features Direct PV interface design can reduce the need for a separate combiner box; an MPPT controller is selected separately to match the array and project. AC coupling supports integration with existing PV inverters, while DC charging equipment can be incorporated into a PV-storage-charging system. Grid-forming controls include PQ, VF, droop and VSG modes. The system can coordinate grid-connected and off-grid operation, subject to project configuration. Parallel configurations can use one-cluster/one-management or centralized battery management. In parallel operation, SOC-based power adjustment can help balance battery clusters. PV-side reverse-polarity protection, buck-boost conversion options, remote EMS monitoring, event records and OTA functions are described in the supplied brochure. Separate equipment blocks simplify fault isolation and service. The brochure gives approximate split-unit weights of 85 kg for the converter and 60 kg for the MPPT controller. Solution configurations Typical concepts in the supplied material include PV-storage-diesel-charging microgrids, PV expansion with a 600 kWp array, one-cluster/one-management parallel microgrids, AC-coupled PV-storage, diesel-storage backup, and DC-side parallel PV-storage-charging systems. The final topology, protection, transfer behavior, and equipment ratings must be verified for each project. For PV-side DC/DC input, see [LEONA-M200K 200 kW PV MPPT controller](/en/product/leona-m200k). Ask VGRID to check compatibility with the battery, PV array, generator, and site grid. DC interfaces, operating modes and project limits DC interfaces and split wall-mounted structure The wall-mounted LEONA-H135K uses separate converter and MPPT-controller units. The brochure lists IP65 protection and approximate unit weights of 85 kg (converter) and 60 kg (MPPT controller). DC terminals include BAT1 (+/−) for the battery and DC1/DC2 (+/−) reserved for the DC bus or project-selected PV/MPPT equipment. LOAD A/B/C/N is the AC load output; GEN is the grid connection, while DG is the diesel-generator connection. COM-1/COM-2 are communication interfaces. Terminal assignment and conductor sizing must follow the approved wiring diagram. Operating modes Documented control modes include PQ, VF, droop and VSG. Depending on the system design, the PCS can form an islanded AC bus, coordinate grid-connected operation, work with an AC-coupled PV inverter, or integrate a diesel generator. The brochure describes grid/generator transfer below 10 ms; confirm this value and the actual transfer arrangement against the approved configuration. Parallel designs include one-cluster/one-management and centralized battery management. Application boundaries This is a project-configured microgrid PCS, not a plug-and-play promise for every PV array, battery, generator or site grid. The MPPT controller is selected to match PV voltage/current and array design. Verify battery voltage and BMS protocol, PV operating window, generator capability, protection/selectivity, grounding, transfer logic, load step, parallel-unit limits and local code before ordering. The 600 kWp PV in the diagram is an example configuration, not a guaranteed maximum input rating. Solution diagrams from the LEONA-H135K brochure These six diagrams show example topologies. They illustrate possible system arrangements and are subject to project engineering validation. PV-storage-diesel-charging hybrid inverter solutionMPPT expansion example with a 600 kWp PV arrayAC-coupled PV-storage-diesel-charging solutionParallel microgrid with one-cluster/one-managementDC-side parallel PV-storage-charging microgridDiesel-storage backup solution ### FAQ **Q: What is LEONA-H135K?** It is a wall-mounted, split-architecture microgrid energy storage PCS. The supplied brochure lists 135 kVA rated off-grid output and IP65 protection. **Q: Can LEONA-H135K connect to PV and an existing PV inverter?** The brochure describes direct PV interface options with separately selected MPPT equipment and AC-coupled integration with existing PV inverters. Confirm the array and inverter compatibility for the project. **Q: Can it work with a diesel generator?** The brochure includes grid and generator connections and PV-storage-diesel and diesel-storage backup configurations. Generator ratings, transfer sequence and controls require project validation. **Q: Does LEONA-H135K support parallel operation?** The brochure describes one-cluster/one-management and centralized parallel configurations, including SOC-based power adjustment. Confirm the permitted unit count and battery controls for the selected design. **Q: What is the rated output: 135 kW or 135 kVA?** The supplied technical brochure states 135 kVA rated off-grid output and does not specify rated active power in kW. Confirm the kW rating against the approved datasheet before publishing a kW claim. **Q: What DC interfaces does the LEONA-H135K provide?** The brochure identifies BAT1 (+/−) for the battery, DC1/DC2 (+/−) reserved for the DC bus or project-selected PV/MPPT equipment, and separate COM-1/COM-2 communication ports. LOAD A/B/C/N is AC output; GEN is the grid input and DG is the diesel-generator input. Confirm terminal use against the approved wiring diagram. **Q: Which operating modes and microgrid applications are supported?** Documented modes include PQ, VF, droop and VSG. Example configurations include off-grid PV-storage-diesel, AC-coupled PV, grid/generator transfer, parallel battery clusters and PV-storage-charging. Final controls, transfer sequence and compatibility require project engineering. **Q: What should be checked before selecting a wall-mounted energy storage PCS?** Check the mounting surface and clearances, IP65 installation conditions, battery voltage and BMS protocol, PV/MPPT voltage-current window, generator and grid ratings, wiring/protection, grounding, load steps and permitted parallel configuration. The brochure’s 600 kWp PV scheme is an example, not a guaranteed product limit. # Wall-mounted PV inverter MPPT ## LEONA-M200K 200 kW Wall-Mounted Step-Up/Step-Down MPPT Controller - SKU: LEONA-M200K - MOQ: 1 set - URL: https://www.vgridpower.cn/en/product/leona-m200k ### Summary LEONA-M200K is a 200 kW IP65 wall-mounted step-up/step-down MPPT controller for PV arrays in DC-coupled microgrids. The V1.5 specification lists 8 MPPT trackers, 16 PV inputs, a 200–950 V MPPT range and a 0–950 V DC output range, allowing PV voltage to be managed independently of battery voltage. It is a PV DC/DC controller, not a battery PCS. ### Key features - 200 kW PV DC/DC MPPT controller, wall-mounted IP65 enclosure - Step-up/step-down conversion; PV voltage can be configured independently of battery voltage - 8 MPPT trackers and 16 PV string inputs - PV open-circuit voltage 200–1100 V; MPPT operating range 200–950 V - DC output range 0–950 V; rated 700 V, maximum current 288 A - Maximum efficiency 99.26%; parallel operation supported; EMS RS485 and battery CAN/RS485 ### Specifications - Model: LEONA-M200K - Rated PV power: 200 kW - PV open-circuit voltage: 200–1100 V - MPPT operating range: 200–950 V - Rated voltage: 700 V - Start voltage: 250 V - PV input channels: 16 - MPPT trackers: 8 - Maximum PV branch current: 18 A × 16 - MPPT current: 36 A × 8 - MPPT short-circuit current: 39.6 A × 8 - DC output voltage range: 0–950 V - DC output rated voltage: 700 V - Maximum DC output current: 288 A - Communication: EMS RS485; battery CAN or RS485 - DIDO: 2 DI / 2 DO - Maximum efficiency: 99.26% - Standby / no-load power: <15 W / <100 W - Installation / enclosure: Wall-mounted / IP65 - Corrosion class: C5-M - Dimensions / weight: 765 × 597 × 266 mm / 57 kg - Operating temperature / humidity: −30 to 60 °C; derating above 45 °C / 5–95% - Cooling / altitude: Intelligent forced air / up to 4000 m; derating above 2000 m - Protections / certification listed: Overtemperature, overcurrent, overvoltage, ground short-circuit; IEC 62477, IEC 62109, EMC LEONA-M200K: 200 kW wall-mounted PV DC/DC MPPT controller The latest English V1.5 technical specification names the unit **LEONA-M200K MPPT Controller** and defines it as an IP65 wall-mounted step-up/step-down PV DC/DC controller for DC-coupled microgrids. It converts PV input to a controlled DC output. It is not a battery PCS or a standalone hybrid inverter. How the controller connects in a DC-coupled system PV strings enter the 16 PV terminals. Eight independent MPPT trackers control the PV channels, and the DC output connects to the system DC bus / compatible storage conversion equipment. The document notes that battery voltage is independent of PV configuration and that the output adapts to the battery-side DC voltage. Confirm control communications, allowable bus range and current sharing with the PCS or system integrator before combining models. Topology diagram from the LEONA-M200K Technical Specification V1.5.MPPT and DC output specifications Rated PV power 200 kW; 16 PV input channels and 8 MPPT trackers. PV open-circuit voltage 200–1100 V; MPPT operating range 200–950 V. Rated voltage 700 V; startup voltage 250 V. Maximum branch current 18 A × 16; MPPT current 36 A × 8; MPPT short-circuit current 39.6 A × 8. DC output range 0–950 V; rated 700 V; maximum current 288 A. Maximum efficiency 99.26%; standby consumption below 15 W and no-load consumption below 100 W. Core features and protection The V1.5 document describes wide PV and output ranges, parallel operation, soft-start circuitry, wall mounting, IP65 protection and C5-M corrosion resistance. Listed protections include overtemperature, overcurrent, overvoltage and ground short-circuit protection. Thermal and altitude derating curves are included in the source specification; the stated ambient range is −30 to 60 °C with derating above 45 °C, and the stated altitude is up to 4000 m with derating above 2000 m. Interface and wiring notes **PV:** PV1–PV16 inputs; recommended 5 mm² cable as a reference. PV SWITCH1 controls PV1–PV8 and PV SWITCH2 controls PV9–PV16. **DC output / battery-side bus:** BAT+ and BAT−; factory terminals may be SC95-12 with recommended 95 mm² cable or RNB100-12 with recommended 120 mm² cable. **EMS communication:** J2 RS485. The J3 port carries EMS RS485 and battery CAN/RS485 signals, plus 12 V and ground. **Digital I/O:** J4 provides 2 DI and 2 DO signals. Address dial and communication-matching resistor switches are shown in the port table. **Commissioning and grounding:** waterproof RJ45 debug interface, reserved WIFI/4G position and PE ground terminal; the specification recommends a 10 mm² grounding conductor. Cable sizes are manufacturer recommendations for reference only. Final conductor size, protection and terminations must be selected for the installation conditions and applicable electrical code. Controller connector layout and port-definition table, page 8 of the V1.5 specification.Communications pinout, DC terminals and recommended cables, page 9 of the V1.5 specification.Use in a project LEONA-M200K is suited to PV-side conversion in DC-coupled commercial and industrial storage microgrids, especially where PV arrays are distributed and MPPT units can be installed near the array to reduce long PV cable runs. It can be evaluated with a compatible PCS and battery DC bus; an approved topology, controller count, bus voltage, PV string design, communications map and protection plan are required. See the [LEONA-B750K split-type hybrid inverter system](/en/product/sp750h54pstd-2) for the related microgrid solution examples. Documents and standards The V1.5 specification lists IEC 62477, IEC 62109 and EMC. Request the certificates applicable to the supplied model and destination market. Download the English V1.5 technical specification from this page and use its full pinout and derating curves for detailed design. ### FAQ **Q: What is LEONA-M200K?** It is a 200 kW wall-mounted step-up/step-down PV MPPT DC/DC controller for DC-coupled systems. It controls PV power into a DC bus; it is not the battery PCS. **Q: How many MPPT trackers and PV inputs does it have?** The V1.5 specification lists 8 MPPT trackers and 16 PV input channels, with up to 18 A per PV branch and 36 A per MPPT. **Q: What are the current voltage ranges?** V1.5 lists 200–1100 V PV open-circuit voltage, 200–950 V MPPT operating range, and 0–950 V DC output range. Rated voltage is 700 V and start voltage is 250 V. **Q: What are the communication and signal interfaces?** EMS uses RS485; battery communications support CAN or RS485. The controller provides 2 digital inputs and 2 digital outputs. Confirm pin assignments in the V1.5 port table. **Q: Can multiple controllers operate in parallel?** The specification states multi-unit parallel operation is supported. Confirm the permitted count, current sharing method, address settings and EMS integration for the project. # Microgrid AC all-in-one cabinet (transformer) ## LEONA-B750K 750 kW Split-Type Hybrid Inverter System - SKU: LEONA-B750K - MOQ: 1 unit - Lead time: 15–30 days - URL: https://www.vgridpower.cn/en/product/sp750h54pstd-2 ### Summary LEONA-B750K is VGRID’s 750 kW split-type hybrid inverter and energy-storage conversion system. It combines a grid-forming PCS, EMS, isolation transformer and grid/off-grid switching in an IP54 cabinet. PV MPPT controllers are separate optional units; the design supports six battery branches, six PV/MPPT interfaces, utility or generator input, and DC- or AC-coupled microgrid solutions. ### Key features - 750 kW class split-type hybrid inverter / energy-storage conversion system; brochure AC output: 750 kVA rated, 825 kVA maximum - Grid-forming PCS with PQ, VF, droop and VSG operating modes - IP54 cabinet, built-in isolation transformer, EMS and automatic grid/off-grid transfer under 20 ms per brochure - Six battery connection branches and six PV/MPPT output interfaces; PV MPPT controllers are separately selected - Direct PV wiring interface is designed to avoid a separate combiner box in the documented configuration - Brochure includes DC-coupled, 2.25 MW parallel, VSG parallel, AC-coupled and online UPS solution diagrams ### Specifications - Model: LEONA-B750K - Rated active power: 750 kW class (project-confirmed); verify against nameplate - AC off-grid rated apparent output: 750 kVA - Maximum AC output apparent power: 825 kVA - Maximum AC output current: 1194 A - Battery rated voltage range: 680–900 V - Maximum battery voltage: 950 V - Maximum battery current: 200 A × 6 branches - AC rated voltage: 400/230 V - Grid voltage range: −20% to +15% - Grid frequency: 50 Hz (47–52 Hz) / 60 Hz (57–62 Hz) - Output transfer time: <20 ms, as stated in brochure - Overload: 1.1× continuous / 1.25× 60 s / 1.5× 100 ms (<35 °C) - Maximum efficiency: 97.8% - Isolation transformer: Built in; Znyn0 - Protection / enclosure: IP54 - Dimensions / weight: 1200 × 2018 × 1227 mm / approx. 2700 kg - Operating temperature: −30 to 60 °C; derating above 45 °C - Humidity / altitude: 5–95% / up to 4000 m; derating above 2000 m LEONA-B750K: a split-type hybrid inverter system for microgrids The new product name in the latest brochure is **LEONA-B750K**. It is a split-type energy-storage conversion system for commercial and industrial microgrids. The user-confirmed product class is 750 kW. The brochure’s electrical table separately lists 750 kVA rated off-grid apparent output, 825 kVA maximum output and 1194 A maximum output current; confirm the active-power nameplate and final configuration on the project datasheet. Architecture and core equipment The cabinet combines a grid-forming PCS, EMS, isolation transformer and automatic grid/off-grid switching. The enclosure is IP54. The architecture keeps PV MPPT controller units separate, so they can be selected and located near the PV array. The brochure shows six battery branches (BAT1–BAT6) and six PV/MPPT interface groups. PV direct-wiring interfaces are intended to avoid a separate combiner box in the documented arrangement; confirm string fusing and protection against the final single-line diagram. Power path: **PV strings → separately selected MPPT controller(s) → LEONA-B750K DC interface ↔ battery branches; PCS ↔ isolation transformer ↔ AC load bus.** Utility and generator inputs connect through the system transfer arrangement shown in the project diagrams. AC-coupled PV inverters and DC charging equipment can be included when the interface and control design are approved. Operating modes and control The brochure lists PQ, VF, droop and VSG grid-forming modes. It describes active state-of-charge balancing for parallel battery clusters, boost-buck conversion so PV output voltage is not constrained by battery voltage, PV reverse-polarity protection, short-circuit protection, cloud diagnostics, event and waveform records, and remote OTA updates. The brochure states automatic grid/off-grid transfer under 20 ms; verify the test conditions and transfer device in the offered configuration. PV-side ground-fault behavior should be confirmed against the manufacturer’s detailed protection document for the project. Published electrical and environmental data Battery: 680–900 V rated range, 950 V maximum; up to 200 A × 6 branches as listed. AC off-grid output: 750 kVA rated, 825 kVA maximum, up to 1194 A; rated voltage 400/230 V. Grid range: −20% to +15%; 50 Hz (47–52 Hz) or 60 Hz (57–62 Hz). Overload: 1.1× continuous, 1.25× for 60 s, 1.5× for 100 ms below 35 °C. Maximum efficiency 97.8%; built-in Znyn0 isolation transformer; IP54. Dimensions 1200 × 2018 × 1227 mm; approximately 2700 kg; −30 to 60 °C with derating above 45 °C. Solutions shown in the LEONA-B750K brochure **DC-coupled microgrid, one cluster per controller:** PV arrays connect to separate MPPT units; six battery clusters are shown at 261 kWh each, while grid and generator feed the source-transfer arrangement. **DC-coupled storage and charging:** the diagram shows four 261 kWh battery clusters and DC chargers on the DC bus. **2.25 MW parallel microgrid:** the brochure presents three 750 kW-class cabinets in a parallel system with grid, generator, ATS and STS. **VSG parallel:** a communication-free parallel arrangement is illustrated; the claimed “unlimited” unit count requires written engineering validation. **AC-coupled and online UPS:** existing PV inverters and critical loads connect through the illustrated transfer and storage architecture. Battery energy values and one-line topology in these diagrams are examples, not a project design guarantee. Ports and installation interfaces Cabinet ports include BAT1–BAT6 battery outputs, PV1–PV6 / MPPT interfaces, GRID three-phase four-wire input, LOAD three-phase four-wire output, PE grounding bar, EMS/communications and a 220 V service outlet. The brochure identifies OT terminals for battery, grid and load and separate SC terminals for MPPT output; use the cabinet terminal drawing and supplied manual for conductor selection. ATS/STS and upstream protective-device requirements are defined at system level. LEONA-B750K cabinet layout and interface definitions from the product brochure.Documented examples: one-cluster-one-management and DC-coupled PV-storage charging.The brochure illustrates a 2.25 MW three-cabinet design and a VSG parallel arrangement. Final parallel limits require project approval.Documented AC-coupled and online UPS microgrid configurations.Downloads and engineering boundary Download the latest LEONA-B750K brochure and request the configuration-specific single-line diagram, parallel control statement, transfer test conditions, battery interface requirements and applicable certificates. Confirm battery cluster limits, controller count, PV protection, generator synchronization, ATS/STS ratings, grounding, fault levels and applicable grid rules before final design. Compare the [SP375HAG2 / SP500HAG2 hybrid cabinets](/en/product/sp375-500hag2) when integrated MPPT is preferred, or the [LEONA-M200K wall-mounted MPPT controller](/en/product/leona-m200k) for a separately deployed PV conversion stage. ### FAQ **Q: What is the new product name for the 750 kW cabinet?** The latest brochure identifies it as the LEONA-B750K split-type hybrid inverter / energy-storage conversion system. The existing product URL is retained to avoid breaking prior links. **Q: Does LEONA-B750K include PV MPPT controllers?** The design uses separate MPPT controller units that can be selected and expanded as needed. The cabinet provides six PV/MPPT interface groups; confirm controller count and array allocation in the project diagram. **Q: What are the documented AC output ratings?** The brochure lists 750 kVA rated off-grid output, 825 kVA maximum output and 1194 A maximum output current. The 750 kW class active-power designation should be checked against the final nameplate and project datasheet before procurement. **Q: Which system configurations are shown?** The brochure illustrates one-cluster-one-management DC coupling, DC-coupled PV-storage charging, a 2.25 MW parallel microgrid, VSG no-communication parallel operation, AC coupling and an online UPS microgrid. **Q: Does the brochure claim unlimited VSG parallel operation?** It labels the no-communication VSG configuration as having no stated unit limit. Treat this as a brochure-level control claim, not a project capacity guarantee; obtain written approval for the selected cabinet count, protection and operating conditions. ## SP250HAG2T 250 kW PV-Storage Hybrid Inverter Cabinet - SKU: SP250HAG2T - MOQ: 1 unit - Lead time: 15-30 days - URL: https://www.vgridpower.cn/en/product/sp250hag2t ### Summary The SP250HAG2T is a 250 kW active-power hybrid microgrid cabinet with a listed 250 kVA apparent-power rating. It integrates PCS, PV MPPT, EMS, PCM transfer equipment, AC/DC distribution and an isolation transformer for projects connecting PV, batteries, the utility grid and a diesel generator. ### Key features - 250 kW rated active power; 250 kVA published apparent-power rating - PCS, MPPT, EMS, PCM transfer, AC/DC distribution and isolation transformer in one cabinet - PV, battery, grid and diesel-generator connections - 680–900 V rated battery range; 200–850 V MPPT range - Up to 3 units in parallel for the specified model - IP54 enclosure; derating above 45 °C ### Specifications - Model: SP250HAG2T - Maximum battery voltage: 950V - Minimum battery voltage: 680V - Rated battery voltage range: 680V-900V - Maximum battery current: 200A*2 - PV power: 120KW*2 - Maximum PV voltage: 950V - Minimum PV voltage: 200V - MPPT voltage range: 200V-850V - MPPT rated voltage: 600V - Maximum input current: 200A*2 - High-voltage side voltage range: 500V-950V - Rated apparent power (grid-tied): 250kVA - Rated current (grid-tied): 362A - Rated grid voltage: 400V/230V - Grid voltage range: -20%~15% - Grid unbalance: 125% - Grid frequency range: 50Hz/47Hz~52Hz(60Hz/57Hz~62Hz) - Current harmonics: <3% (above 30% load) - Power factor: -1~1 - Rated apparent output power (off-grid): 250kVA - Maximum output power (off-grid): 275kVA - Rated output current (off-grid): 362A - Maximum output current (off-grid): 398.2A - Rated voltage (off-grid): 400V/230V - Output voltage harmonics: <2% (resistive load) - Unbalance (off-grid): 100% - Frequency range (off-grid): 50/60Hz - Output overload (current) Ie: rated output current: Ie*1.199.3% - Application scenarios: PV-storage microgrid, backup power, emergency power, diesel-storage, construction sites, oilfield extraction, field construction, etc. SP375HAG2 and SP500HAG2: 375 kW and 500 kW hybrid cabinet options The **SP375/500HAG2** family combines PV conversion, battery PCS and microgrid transfer equipment in one cabinet. The two configurations are marketed in the 375 kW and 500 kW power classes. The published on-grid apparent-power ratings are **375 kVA and 500 kVA**; verify rated active power, power factor and the final nameplate for the ordered version. What changes between the 375 and 500 models? Both models use the same integrated architecture: PCS, MPPT, EMS, PCM transfer switch and AC/DC distribution. The documented PV input is 120 kW × 3 for the 375 configuration and 120 kW × 4 for the 500 configuration. Battery current, AC current and the PV channel count differ by model; select from the matching datasheet rather than treating one cabinet as a software-only power upgrade. System topology **PV strings → cabinet MPPT → DC bus ↔ PCS ↔ AC bus → loads / grid.** Batteries connect to the DC bus. A diesel generator connects to the designed AC source interface; PCM transfer equipment handles the configured grid/off-grid source transition. The family data lists no built-in isolation transformer; a project that requires one must include an appropriately sized external transformer. Operating modes Grid-connected PV self-consumption and surplus export where enabled and permitted. Battery charging from available PV and discharge for configured load support or peak management. Off-grid operation with PCS forming/supporting the AC bus when the selected controls and system design allow it. Diesel hybrid operation, with generator dispatch and battery charging subject to EMS settings and generator limits. The product data lists active transfer at 0 ms and passive transfer below 20 ms. The actual sequence depends on control mode, upstream protection and site commissioning. Verified selection data Battery rated range: 680–900 V; maximum 950 V. PV input: 120 kW × 3 / 120 kW × 4; maximum PV voltage 950 V. Grid-tied apparent power: 375 kVA / 500 kVA; grid voltage 400/230 V, three-phase four-wire. Off-grid maximum apparent output: 412.5 kVA / 550 kVA (confirm duty and overload conditions). Maximum 3 units in parallel for the specified family configuration. Protection is listed as IP54/IP20 by configuration; confirm the ordered enclosure. Applications and limits Consider the 375 model where the project needs the integrated PV-storage functions at the lower power class; consider the 500 model for a higher load or more PV input channels. Both can suit PV-battery-diesel microgrids, construction sites, oilfields and backup power. Confirm active power at the required power factor, motor-starting demand, battery current, transformer requirements, grid code and the parallel-control version. Documents and related equipment Request the matching 375 or 500 datasheet, wiring diagram, transfer sequence and available certificates for the supplied version. Compare with [SP250HAG2T 250 kW](/en/product/sp250hag2t) for a transformer-integrated cabinet or [LEONA-B750K 750 kW PCS](/en/product/sp750h54pstd-2) for a higher-power PCS-led design. ### FAQ **Q: What is the configuration difference between SP375HAG2 and SP500HAG2?** The documented PV input differs: 120 kW × 3 for SP375HAG2 and 120 kW × 4 for SP500HAG2. The on-grid apparent-power ratings are 375 kVA and 500 kVA. Confirm active power and power factor for the exact configuration. **Q: Can the 375 kW and 500 kW cabinets connect PV, batteries and a diesel generator?** Yes. The family integrates PV MPPT and PCS, and supports battery, PV and diesel connection. Grid interface, protection and operating sequence must follow the project drawings. **Q: How many SP375/500HAG2 cabinets can be paralleled?** The product data specifies up to three units for the family. Confirm controller compatibility and the permitted combination before designing a multi-cabinet system. **Q: Does the cabinet include an isolation transformer?** The published data lists no built-in isolation transformer for this family. Add an external transformer if the site voltage or grounding design requires one. **Q: Are 375 kW / 500 kW the same as 375 kVA / 500 kVA?** No. kW is active power and kVA is apparent power. The published on-grid figures are 375/500 kVA; obtain the final active-power rating at the required power factor from the project datasheet. # Hybrid Inverter Hybrid PCS 30–60 kVA with isolated air duct design, compatible with 280/314 Ah cells, integrated on-grid/off-grid switching device ## SP30/25/15HBPS Microgrid PCS Series - SKU: SP30HBPS - MOQ: 1 pcs - URL: https://www.vgridpower.cn/en/product/sp30-25-15hbps ### Summary This rack-mounted PCS series is designed for small and medium energy-storage microgrids. It includes grid/off-grid switching, supports parallel and diesel-generator operation, and specifies transfer in under 10 ms for applicable configurations. ## SP60/50/40/30HCPS Microgrid PCS Series - SKU: SP60HCPS - MOQ: 1 pcs - URL: https://www.vgridpower.cn/en/product/sp60-50-40-30hcps ### Summary This PCS series serves small and medium energy-storage microgrids. It includes grid/off-grid switching and supports multiple units in parallel and hybrid operation with diesel generators. # Microgrid AC Cabinet MPS Integrated cabinet solution combining PCS, MPPT, EMS and isolation transformer, covering the 250–750 kVA power range # Grid-tied energy storage PCS A PCS for grid-tied operation only, suited to peak-valley arbitrage and demand management scenarios # Rack-mounted three-phase hybrid inverter Three-phase commercial and industrial PV + storage solution, with isolated air ducts and a wide-voltage, high-current DC design ## SP60/50/40/30HCG2 Series Hybrid Inverter - SKU: SP60HCG2 - MOQ: 1 set - URL: https://www.vgridpower.cn/en/product/sp60-50-40-30hcg2 ### Summary The SP60/50/40/30HCG2 series hybrid inverter features isolated air ducts and a wide-voltage, high-current DC design. It is compatible with 280/314Ah cells and has a built-in grid-tied/off-grid transfer device. It supports parallel connection of multiple units, hybrid operation with diesel generators, and fast grid-tied/off-grid switching, with a maximum efficiency of 98.2%. ### Key features - Ducted thermal isolation, wide DC voltage and high current - 150% overload capability - Built-in STS for seamless transfer - Compatible with 280/314Ah cells - Dual MPPT, diesel generator hybrid - Maximum efficiency 98.2% ### Specifications - Model: SP60HCG2 / SP50HCG2 / SP40HCG2 / SP30HCG2 - Rated Power (Grid-tied): 60kVA / 50kVA / 40kVA / 30kVA - Rated Current (Grid-tied): 87A / 72.5A / 58A / 43.5A - Grid Voltage: 400V/230V, range -20%~+15% - Grid Frequency: 50Hz (47~52Hz) or 60Hz (57~62Hz) - Rated Output (Off-grid): 60kVA / 50kVA / 40kVA / 30kVA - Max Output (Off-grid): 66kVA / 55kVA / 44kVA / 33kVA - Max Battery Voltage: 850V - Min Battery Voltage: 200V - Rated Battery Voltage Range: SP60HCG2: 420V-850V; SP50HCG2: 350V-850V; SP40HCG2: 270V-850V; SP30HCG2: 210V-850V - Max Battery Current: 150A - Max PV Power: 38.4kW+38.4kW - Max PV Voltage: 850V - PV Startup Voltage: 250V - MPPT Voltage Range: 200V-800V (when DC-side paralleled, max PV input voltage must be <730V) - Max PV Current: 64A+64A - Grid/Off-grid Transfer Time: <10ms - Max Efficiency: 98.2% - Standby/No-load Power Consumption: Standby <15W / No-load <160W - Protection Rating: IP20 (IP5X for core control section) - Dimensions: W*L*H 440*670*200mm - Weight: <50kg - Operating Temperature: -30~60℃ (derating above 45℃) - Humidity: 5~95% - Cooling Method: Intelligent Air Cooling - Altitude: 4000m (derating above 2000m) - Power Factor: -1~1 - Current Harmonics: <3% (above 30% load) - Output Overload: 1.1x continuous / 1.25x for 100s / 1.5x for 100ms (@<35℃) - Application Scenarios: Commercial & industrial energy storage + emergency backup power, small PV-storage-diesel microgrid, mobile energy storage, PV-storage charging station - Core Features: Isolated air duct, 150% overload, seamless transfer (built-in STS), diesel generator hybrid, multi-unit paralleling, three-phase independent grid connection The SP60/50/40/30HCG2 series hybrid inverter is a high-efficiency, high-reliability hybrid inverter developed for small and medium-sized energy storage microgrids. It integrates 2 PV MPPT channels and supports PV connection; the DC side features wide voltage and high current and is compatible with 280/314Ah cells; it has a built-in static transfer switch (STS) and supports parallel connection of multiple units, hybrid operation with diesel generators, and fast grid-tied/off-grid switching. It is suitable for small commercial and industrial applications, island microgrids, farms, villas, and echelon utilization of batteries. ### FAQ **Q: Do you support customization?** Yes. VGRID POWER (Shenzhen) can provide custom development and OEM/ODM services for PCS, MPPT, DCDC, STS and all-in-one cabinet products according to project requirements. Are the products certified? The products have obtained multiple domestic and international certifications including CE, TUV Rheinland, G99/EMC, JET (Japan) and ISO9001. Please contact our sales team for specific certification documents. Do you provide technical support? Yes. The company provides solution design, commissioning, after-sales service and global technical support for microgrid and energy storage projects. # DC/DC module 60–210 kW isolated-airflow DC converter, supporting bidirectional buck-boost and a wide 200–950 V input ## SP120/60HCPV & SP105HCDC Series DCDC Modules - SKU: SP120HCPV - MOQ: 1 set - URL: https://www.vgridpower.cn/en/product/sp120-60hcpv-sp105hcdc ### Summary The SP120/60HCPV and SP105HCDC series are energy storage DC converters developed for DC-coupled solutions in small and medium-sized energy storage microgrids. They feature isolated air ducts, a wide input voltage range, multiple PV inputs, and high conversion efficiency (99.3%). ### Key features - Isolated air duct design - Maximum efficiency 99.3% - Wide DC voltage range input - Multiple PV inputs - Battery heterogeneity (SOC balancing) - Supports up to 15 units in parallel ### Specifications - Model: SP60HCPV / SP120HCPV / SP105HCDC - Rated Power: 60kW / 120kW / 105kW - PV Open-Circuit Voltage: 200V-900V - MPPT Voltage Range: 200V-850V - Rated Voltage: SP60HCPV: 500V; SP120HCPV: 600V; SP105HCDC: 525V - PV Start-Up Voltage: 250V - Number of Inputs: 1 / 2 / 4 channels optional - Maximum PV Current: SP60HCPV: 120A/60A×2/30A×4; SP120HCPV: 200A/100A×2/50A×4; SP105HCDC: 200A/100A×2/50A×4 - Short-Circuit Current: SP60HCPV: 30A×4; SP120HCPV/SP105HCDC: 60A×4 - High-Voltage Side Voltage Range: 500V-950V - High-Voltage Side Rated Voltage: 680V - High-Voltage Side Maximum Current: 90A / 180A / 180A - Communication Port: EMS: RS485 / Battery: CAN or RS485 - DIDO: DI: 2 channels / DO: 2 channels - Maximum Efficiency: 99.3% - Standby/No-Load Power Consumption: Standby <15W / No-load <100W - Protection Rating: IP20 (IP5X for core control section) - Dimensions: W*L*H 440*560*183mm - Weight: 29kg - Operating Temperature: -30~60℃ (derating above 45℃) - Humidity: 5~95% - Cooling Method: Intelligent forced air cooling - Altitude: 4000m (derating above 2000m) - Protection Functions: Over-temperature protection, over-current protection, over-voltage protection, ground short-circuit protection - Core Features: Energy storage DC converter, isolated air duct, battery heterogeneity (SOC balancing), wide DC voltage range, multiple PV inputs, small input-output voltage difference, supports multi-unit parallel connection (up to 15 units) - Application Scenarios: Commercial and industrial PV-storage integration, PV-storage-diesel small microgrid, mobile energy storage, PV-storage charging station The SP60HCPV / SP120HCPV energy storage DC converters and the SP105HCDC DC-DC modules adopt an isolated air duct design, support a wide DC voltage input range, are compatible with heterogeneous batteries (SOC balancing), provide multiple protections including over-temperature, over-current, over-voltage, and short-circuit-to-ground, and support parallel operation of up to 15 units. They are suitable for DC-coupled microgrid scenarios such as commercial and industrial PV-storage integration, small PV-storage-diesel microgrids, mobile energy storage, and PV-storage charging stations. ### FAQ **Q: Do you support customization?** Yes. VGRID POWER (Shenzhen) can provide custom development and OEM/ODM services for PCS, MPPT, DCDC, STS and all-in-one cabinet products according to project requirements. Are the products certified? The products have obtained multiple domestic and international certifications including CE, TUV Rheinland, G99/EMC, JET (Japan) and ISO9001. Please contact our sales team for specific certification documents. Do you provide technical support? Yes. The company provides solution design, commissioning, after-sales service and global technical support for microgrid and energy storage projects. ## SP210HCDC DC Controller - SKU: SP210HCDC - MOQ: 1 set - URL: https://www.vgridpower.cn/en/product/sp210hcdc ### Summary The SP210HCDC DC controller is a rack-mounted DCDC controller that integrates voltage conversion, energy management and safety protection. It supports bidirectional step-up/step-down conversion, a wide input and output voltage range and parallel operation of multiple units, with a maximum efficiency of 99.2%. ### Key features - Rack-mounted installation - Bidirectional step-up/step-down conversion - Wide input/output voltage range - Maximum efficiency 99.2% - Supports parallel connection of multiple units - Battery voltage unaffected by configuration ### Specifications - Model: SP210HCDC - Rated Power: 210kW - Input-side Voltage Range: 200V-950V - Input-side Rated Voltage: 700V - Number of Input Channels: 1 channel - Input-side Maximum Current: 300A - Output-side Voltage Range: 400V-950V - Output-side Rated Voltage: 700V - Output-side Maximum Current: 300A - Communication Port: EMS: RS485 / Battery: CAN or RS485 - DIDO: DI: 4 channels / DO: 4 channels - Maximum Efficiency: 99.2% - Standby/No-load Power Consumption: Standby <15W / No-load <100W - Protection Rating: IP20 - Dimensions: W*H*D 490*560*200mm - Weight: 45kg - Operating Temperature: -30~60℃ (derate above 45℃) - Humidity: 5~95% - Cooling Method: Intelligent forced air cooling - Altitude: 4000m (derate above 2000m) - Protection Functions: Over-temperature protection, over-current protection, over-voltage protection, ground short-circuit protection - Core Features: Rack-mounted DCDC controller, supports bidirectional step-up/step-down conversion, wide input/output voltage range, supports parallel connection of multiple units, battery voltage unaffected by configuration - Application Scenarios: Commercial and industrial PV-storage integration, small PV-storage-diesel microgrid, PV-storage data center, PV-storage charging station The SP210HCDC DC controller is developed for DC-coupled solutions in small and medium-sized energy storage microgrids. The product uses rack mounting, supports bidirectional step-up/step-down conversion, offers a wide input/output voltage range, provides multiple protection functions and supports parallel operation of multiple units. The battery voltage is not affected by the PV configuration, making it suitable for DC source integration scenarios such as PV-storage flexible DC, hydrogen and wind turbines. ### FAQ **Q: Do you support customization?** Yes. VGRID POWER (Shenzhen) can provide custom development and OEM/ODM services for PCS, MPPT, DCDC, STS and all-in-one cabinet products according to project requirements. Are the products certified? The products have obtained multiple domestic and international certifications including CE, TUV Rheinland, G99/EMC, JET (Japan) and ISO9001. Please contact our sales team for specific certification documents. Do you provide technical support? Yes. The company provides solution design, commissioning, after-sales service and global technical support for microgrid and energy storage projects. # STS Cabinet STS Cabinet ## SP1350H54SW Grid/Off-Grid Transfer Cabinet - SKU: SP1350H54SW - MOQ: 1 pcs - URL: https://www.vgridpower.cn/en/product/sp1350h54sw ### Summary The SP1350H54SW cabinet integrates a hybrid solid-state grid/off-grid transfer switch, isolator and surge protection. Its electromagnetic drive and semiconductor arc-extinguishing design supports seamless transfer, power-flow management and diesel-generator coordination. ## SP2000H54SW Grid/Off-Grid Transfer Cabinet - SKU: SP2000H54SW - MOQ: 1 pcs - URL: https://www.vgridpower.cn/en/product/sp2000h54sw ### Summary The SP2000H54SW cabinet combines a hybrid solid-state grid/off-grid transfer switch, isolator and surge protection. It supports seamless transfer, power-flow management and diesel-generator coordination. # DC-DC converter DCDC/MPPT Maximum power point tracking on the PV side and buck-boost of the DC bus, supporting multiple MPPT channels and wide voltage input # Energy Management System SAEMS VGRID POWER Energy Management System SAEMS # DC module combiner cabinet DC module combiner cabinet --- # Frequently Asked Questions Below are the questions most commonly asked by overseas buyers. If you do not find your answer here, please [contact us](/zh/contact) and we will reply within one business day. Parallel operation and joint commissioning before shipment — every unit is powered up and tested before it is packed. What is the minimum order quantity? VGRID POWER supplies standardized microgrid core equipment, with a minimum order of 1 unit. What are the payment terms? We accept payment before delivery only. For customized or custom-made products, you pay a 50% deposit, with the balance settled before shipment. What is the production lead time? Standardized products are kept in stock; AC all-in-one cabinets are produced and delivered against customer orders, with a lead time of 15–45 days. The delivery date is specified in the contract order. Do you provide OEM and private-label services? Yes. For bulk orders we provide private-label services such as customer silk-screen printing, and the silk-screen cost can be deducted from the bulk order. Which certificates do you provide? ISO 9001/14001/45001 management system certifications, CE/safety/EN50549-1/10, TUV, VDE, G99, AS4777.2, etc. Grid-connection certifications for European, Australian and other countries and regions. What is the warranty period? All products carry a 24-month warranty against manufacturing defects from the date of shipment; defective goods are replaced free of charge or deducted from the next order. **3**business days for a reply **50%**deposit, balance paid before shipment **24**month warranty against manufacturing defects **ISO**9001/14001/45001 and other management system certifications Have other questions? Send us your specifications, quantities and requirements, and our engineering team will get in touch to support your business development. Finished goods awaiting shipment — actual production and packaging photos are provided before shipment. # Delivery Lead Time The following explains how we arrange lead times and payment. Finished goods staging area — standard export packaging is fumigation-free plywood crates; each unit is bagged, boxed and palletized. Lead Time **1–3_days _**Standardized modular products **3–7_days_**Lightly customized products **15–40_days_**Engineered custom all-in-one cabinets The lead time is confirmed in writing in each order confirmation. Standard products: shipment after payment is received; customized products: 50% with the order, balance settled before shipment. Not sure which option suits you better? Tell us your requirements and we will provide options for you to weigh before deciding. # Privacy Policy We only collect the information necessary to respond to inquiries and process orders, and we never sell your data. This page explains what information we collect, what it is used for, and how you can exercise your rights. Our business correspondence information is used solely to fulfill the quotations, production, and delivery you request. Information We Collect Identity**Name and Company**Used to issue order confirmations, invoices, and related documents. Contact**Email and Phone**Used to respond to inquiries, confirm delivery schedules, and provide after-sales contact. Location**Country and Shipping Address**Used to calculate freight, trade terms, and customs clearance requirements. How Data Is Used Preparing Quotations Generating an actionable quotation based on the product and quantity information you provide. Arranging Production and Shipping Used for material preparation, production scheduling, booking, and delivery tracking. After-Sales Support Handling quality feedback, replacements, and spare parts during the warranty period. Retention Period Correspondence will be retained until the warranty period for the supplied goods ends, so that warranty-related inquiries can be handled. After the warranty period expires, only transaction records required by laws and regulations will be retained. Collecting only business-essential information—this is our default principle for handling every inquiry. Cookies Functional Cookies This site uses only one functional cookie to record shopping cart contents, ensuring items are not lost when you return. No Tracking No advertising cookies are used, and no cross-site tracking cookies are used. Your Rights Request a Copy You may request a copy of the data we hold relating to you. Correction and Deletion You may request correction of inaccurate information, or deletion when there is no contractual obligation to retain it. To exercise any of the above rights, please contact us via the [contact page](/zh/contact), and we will process your request as soon as possible after verifying your identity. # Business Description # China's first wind-solar-diesel-storage demonstration project Case Study · Donghai Navigation Safety Administration China's first wind-solar-diesel-storage microgrid demonstration project: (has now operated safely and fault-free for 4 years!) Toward a low-carbon future! The Jigu Reef Lighthouse at the Yangtze River Estuary accelerates its "digital + low-carbon" transformation The Jigu Reef Lighthouse stands on a strategic point where the deep-water channel of the Yangtze River Estuary at Shanghai Port meets the north-south coastal trunk route. The outpost is built on a reef 62 m long and 42 m wide; the lighthouse is cast entirely of reinforced concrete and stands about seven stories tall. The island has not a single grain of soil and not one naturally growing plant; "Jigu Reef" (Chicken Bone Reef) takes its name from its resemblance to a chicken bone. On this reef, where no materials can be sourced locally and all resupply depends on sea conditions, the Shanghai Aids to Navigation Office of the Donghai Navigation Safety Administration retrofitted the lighthouse with an integrated "light, wind, diesel, storage" energy system, taking this lighthouse that guards the throat of the "first maritime gateway of the nation" from manned to unmanned operation. **30 kW**High-wind-resistant PV power system (resistant to Category 14 typhoons) **2×5 kW**High-wind-resistant wind turbines (resistant to Category 14 typhoons) **400 kWh**Lithium iron phosphate battery bank with battery BMS **Approx. 6,000 vessel trips**Daily vessel traffic in surrounding waters **8 → 0 people**Watchkeeping staff on 24-hour shifts → all withdrawn 1. A lighthouse with no soil The Jigu Reef Lighthouse is built entirely on a reef: it stands on a strategic point where the deep-water channel of the Yangtze River Estuary at Shanghai Port meets the north-south coastal trunk route. The outpost is built on a reef 62 m long and 42 m wide; the lighthouse is cast entirely of reinforced concrete and stands about seven stories tall. The island has not a single grain of soil and not one naturally growing plant; "Jigu Reef" takes its name from its resemblance to a chicken bone. **Jigu Reef Lighthouse**　On a reef 62 m long and 42 m wide, cast of reinforced concrete and about seven stories tall; the island has not a single grain of soil and not one naturally growing plant, and takes its name from its resemblance to a chicken bone. No soil means no local materials, no local vegetation, and it also means **everything on the island — equipment, building materials, vegetables, fresh water — depends entirely on vessel transport**. This single fact determines every aspect of operation and maintenance: the cost and risk of one island landing far exceed those of an ordinary inland site. 2. A strategic choke point, the first maritime gateway of the nation The Jigu Reef Lighthouse guards the throat of the "first maritime gateway of the nation" and carries numerous integrated navigation and aids-to-navigation facilities for the busy surrounding waters, including **visual aids to navigation, AIS, VTS, BeiDou CORS, marine meteorological collection, "ten-year fishing ban" monitoring, and CCTV video capture**. Daily vessel traffic is about 6,000 trips, giving it a highly important strategic position for maritime traffic. **Location of the Jigu Reef Lighthouse**　At the junction of the Yangtze River Estuary deep-water channel and the north-south coastal trunk route, guarding the throat of the "first maritime gateway of the nation"; surrounding waters see about 6,000 vessel trips per day. Precisely because the facilities must operate without interruption and the surrounding routes are dense, the lighthouse has extremely high power supply reliability requirements — it cannot "make do"; any power outage directly affects the normal operation of navigation, aids-to-navigation, and maritime regulatory facilities. 3. Before the retrofit: eight people at the mercy of the weather Hidden reefs surround Jigu Reef, so deep-draft supply vessels cannot safely berth at the pier; resupply can only rely on small tenders seizing a chance when the sea is calm, "watching the weather." Most of the island's fresh water comes from the sky — there is a 700-tonne cistern in a low-lying area that collects and settles rainwater for the watchkeeping staff. The tender comes once every ten days to half a month; vegetables are bought by the basketful and eaten over the same ten days to half a month. **Small tender resupplying when conditions allow**　Hidden reefs surround the island, so deep-draft supply vessels cannot safely berth; resupply can only rely on small tenders seizing a chance when the sea is calm, "watching the weather"; the tender comes once every ten days to half a month. Because of the treacherous terrain of Jigu Reef, when summer typhoons or winter cold waves arrive, strong winds drive sea waves violently against the reef, forming rip currents and throwing up hill-like waves; **in the worst sea conditions, wave crests about 40 m high can overtop the 36 m-high seven-story roof**. For eight people to stay on the island long-term in such an environment, watchkeeping itself constitutes a substantial safety risk. The island's power was supplied by 4 × 60 kVA diesel generators, and **8 watchkeeping staff on 24-hour shifts** had to be assigned to ensure the generators ran normally and stably. Before Diesel generation was the only "starting player" 4 × 60 kVA diesel generators supplied the whole island's power, and 8 watchkeeping staff worked 24-hour shifts to keep the generators running. As long as the generators could not stop, the people could not leave; and as long as the people could not leave, O&M costs and safety risks could not come down. After Green power as the mainstay, diesel as backup, unmanned operation The integrated "light, wind, diesel, storage" supply system was commissioned; diesel generation went from "starting player" to "substitute," all watchkeeping staff were withdrawn, and the diesel generators achieved unmanned operation with automatic start/stop testing. 4. The retrofit: integrating light, wind, diesel, and storage To align with the national low-carbon and environmentally friendly development model, change the harsh environment for long-term island staff, reduce the safety hazards of personnel traveling to and from the island, lower Jigu Reef O&M costs, and achieve a triple win in environmental, safety, and economic benefits for routine O&M at Jigu Reef. After a year of deliberation, preparation, construction, and commissioning, **on the eve of the 2023 New Year**, the Shanghai Aids to Navigation Office of the Donghai Navigation Safety Administration completed the "digital + low-carbon" energy system retrofit of the Jigu Reef Lighthouse, giving it a new look in the new year. This retrofit focused on "digitalization" and "low-carbon" intelligent upgrading of the energy system, turning the diesel generation system from "starting player" into "substitute," giving full play to the core role of new energy systems such as solar, wind, and storage, **withdrawing all watchkeeping staff**, and creating an integrated green clean energy supply system of "light, wind, diesel, storage." The new system uses big data to scientifically analyze and compare the power consumption and performance of the original support equipment, and performs automatic energy-saving configuration through the digital system to achieve energy saving and emission reduction, while opening unlimited possibilities for expanding "navigation safety + services" at the Jigu Reef Lighthouse. 01PV system A total of 30 kW of high-wind-resistant PV power systems was added at three locations — **the generator room roof, the platform in front of the generator room, and the lighthouse platform** — with indoor PV MPPT grid-tie controllers. **Three locations · 30 kW total · High-wind-resistant models rated for Category 14 typhoons · Indoor MPPT grid-tie controllers** 02Wind power system **2 sets** of high-wind-resistant 5 kW wind turbines were added and connected to the energy storage battery bank. **2 sets × 5 kW · High-wind-resistant models rated for Category 14 typhoons · Directly connected to the energy storage battery bank** 03Diesel power system The existing diesel generators were retrofitted to achieve **unmanned operation**, with automatic start/stop and automatic testing functions. **Retrofit of existing units · 4 × 60 kVA · Unmanned operation · Automatic start/stop and automatic testing** 04Energy storage system A **400 kWh** lithium iron phosphate battery bank was installed, along with a battery BMS, achieving intelligent electrified energy storage. **400 kWh lithium iron phosphate · With BMS · Intelligent electrified energy storage** PV: installed at three locations — the generator room roof, the platform in front of the generator room, and the lighthouse platform — 30 kW total, resistant to Category 14 typhoons Wind: 2 sets of 5 kW high-wind-resistant wind turbines connected to the energy storage battery bank Diesel: existing units achieve unmanned operation, with automatic start/stop and automatic testing functions 5. The digital back-end monitoring "report card" The new system uses a digital back end to automatically configure energy savings for the power consumption and performance of various support equipment. After the retrofit: After automatic energy-saving configuration by the digital system — all indicators fell substantially **−50%**Reduction in average daily electricity consumption compared with before **−80%**Reduction in average annual diesel consumption compared with before **74%**Reduction in average annual carbon dioxide emissions compared with before **−80%**Reduction in total annual O&M costs compared with before This truly achieves green recyclability and successfully delivers a triple win in **environmental, economic, and safety benefits**. 6. Product selection reference for similar operating conditions Scenarios such as remote island lighthouses, aids to navigation, and offshore platforms share highly consistent operating characteristics: **unmanned, modest power, extremely high reliability requirements, and very narrow maintenance windows**. The corresponding equipment requirements are equally clear — long-term maintenance-free, capable of grid-forming standalone operation, capable of hybrid operation with diesel generators, and strong environmental adaptability. The SP30H series is precisely an integrated model aimed at such operating conditions. [SP30HBG2 SP30H series PV-storage-diesel hybrid inverter all-in-one Rated power (grid-tied) 30 kVA Rated output (off-grid) 30 kVA (max. 33 kVA) Max. efficiency 97.8% Grid/off-grid transfer time The core features of this series are **isolated air duct, 150% overload, seamless transfer (built-in STS), diesel hybrid operation, multi-unit paralleling, and three-phase independent grid connection**, with protection rating IP20 (IP5X for the core control section), dimensions 440×560×183 mm, weight 35 kg, and standby power consumption below 15 W. Applicable scenarios include commercial and industrial energy storage + emergency backup power, small PV-storage-diesel microgrids, mobile energy storage, and PV-storage charging stations. The same product page also offers SP25HBG2 (25 kVA) and SP15HBG2 (15 kVA) options, allowing selection according to actual load. **Note:** The actual equipment configuration of the Jigu Reef Lighthouse described in this article is subject to the owner's published information; the models above serve only as a selection reference for similar remote island / unmanned operating conditions. 7. From one lighthouse to a model In line with the requirements of green and low-carbon transformation and development, the Shanghai Aids to Navigation Office of the Donghai Navigation Safety Administration actively leverages its innovative momentum and strengthens its capacity for green, low-carbon, and navigation safety innovation. Using the "digital + low-carbon" upgrade and retrofit of the Jigu Reef Lighthouse as a platform and opportunity, and through advanced technological innovation, it **created the first intelligent power distribution system in the sea area based on complementary "wind, solar, storage, and diesel"**, pioneering the transition of high-power remote island lighthouses in the sea area from manned to unmanned operation, and developing a virtuous-cycle green energy system through innovative means. **First in the sea area**Intelligent power distribution system with complementary wind, solar, storage, and diesel **Pioneering**Transition of high-power remote island lighthouses from manned to unmanned operation **Triple win**Environmental benefits · Economic benefits · Safety benefits **No island staffing**Reduces safety hazards of personnel traveling to and from the island The value of this model goes beyond the accounts of a single lighthouse. For a group of aging facilities — aids to navigation, lighthouses, offshore platforms, and islands — that "rely on diesel for power, people for maintenance, and the weather for resupply," it offers a path that has already been proven: **use solar, wind, and storage to bring energy consumption down, use digitalization to manage dispatch, use diesel hybrid operation to shore up reliability, and finally withdraw the people.** Frequently asked questions What powered the Jigu Reef Lighthouse before the retrofit? Before the retrofit, the whole island's power was supplied by **4 × 60 kVA diesel generators**, and **8 watchkeeping staff on 24-hour shifts** had to be assigned to ensure the generators ran normally and stably. Are island watchkeeping staff still needed after the retrofit? No. This retrofit **withdrew all watchkeeping staff**, and the diesel generator sets were simultaneously retrofitted for unmanned operation, with automatic start/stop and automatic testing functions. What exactly were the energy-saving results of this retrofit? After automatic energy-saving configuration by the digital system: **average daily electricity consumption fell by 50%, average annual diesel consumption fell by 80%, average annual carbon dioxide emissions fell by 74%, and total annual O&M costs fell by 80%** compared with before. What does "digital + low-carbon" specifically mean? "Low-carbon" means using solar, wind, and storage instead of diesel as the main energy source, downgrading the diesel generators to backup; "digital" means the new system uses big data to compare the power consumption and performance of the original support equipment, performs **automatic energy-saving configuration** through the digital system, and enables online monitoring and automatic dispatch. What if bad weather prevents resupply and power generation? The energy storage system provides a 400 kWh lithium iron phosphate battery as a buffer, and the diesel generators can start and stop automatically as backup. Under normal conditions, solar, wind, and storage are self-sufficient; the diesel generator sets are automatically brought in only when storage is insufficient or the load exceeds new energy output, so there is no longer reliance on small tenders seizing a chance when the sea is calm, "watching the weather." Can this model be replicated to other islands or offshore facilities? Yes. This project created the first intelligent power distribution system in the sea area based on complementary "wind, solar, storage, and diesel," and pioneered the transition of high-power remote island lighthouses from manned to unmanned operation. The same technical path applies to similar facilities such as aids to navigation, lighthouses, offshore platforms, and islands that "rely on diesel for power, people for maintenance, and the weather for resupply." Have a similar remote island, offshore platform, or unmanned scenario? Tell us your operating conditions — load power, available solar/wind resources, and the frequency of on-site maintenance — and we will provide a configuration plan and selection recommendations based on complementary "solar, wind, storage, and diesel." [Consult on a solution](/zh/contact) # Mine Site 2.5 MW Off-Grid Solar-Storage Microgrid # 1.5MW Microgrid for an Injection Molding Plant in Cambodia # Company Qualifications # Company Environment # Analysis of energy storage system STS, PCS, ATS, EMS, BMS **STS, PCS, ATS, EMS and BMS in an Energy Storage System** An energy storage system combines batteries, power conversion equipment, controls and protection. PCS, BMS, EMS, ATS and STS each perform a different role. Their exact connections depend on the system design. **PCS: Power Conversion System** The PCS converts DC power from the battery to AC power for loads or the grid. A bidirectional PCS also converts AC to DC to charge the battery. Depending on its design and configuration, it can operate on-grid, off-grid or in both modes. **BMS: Battery Management System** The BMS monitors battery conditions such as cell voltage, temperature and current. It reports state of charge and battery status, manages cell balancing where supported, and requests protection actions when operating limits are exceeded. The BMS and PCS must use compatible communication protocols and settings. **EMS: Energy Management System** The EMS coordinates the system according to operating priorities and available measurements. For example, it may schedule battery charging, manage peak demand or coordinate solar generation and a generator. It sends commands within the limits reported by the BMS and the capabilities of the PCS and other equipment. **ATS: Automatic Transfer Switch** An ATS selects between two AC sources, such as the grid and a generator, according to its control scheme. The switching arrangement must prevent unintended connection of sources unless the equipment and design explicitly support it. Transfer time depends on the selected device and application. **STS: Static Transfer Switch** An STS uses power semiconductor switches to transfer a load between suitable AC sources. It can provide fast transfer when the sources and equipment satisfy its design requirements. Transfer time and suitability for a particular load must be checked against the device specification; uninterrupted operation cannot be assumed for every installation. **How the components work together** In a solar and battery microgrid, solar generation can supply the loads and, when the system is configured for it, charge the battery. The BMS communicates battery limits; the EMS uses these limits and system measurements to set operating commands; the PCS controls power conversion. An ATS can select a grid or generator source, while an STS may be used where the load and power sources require a compatible fast-transfer arrangement. PV converters, switches and control functions depend on the project configuration. **ATS vs STS: which should a project use?** Selection depends on source characteristics, load sensitivity, acceptable interruption time, fault protection and cost. Review the transfer equipment's specifications and the complete electrical design with the system integrator before choosing. **Frequently asked questions** 1、What is the difference between a PCS and a BMS? The PCS converts and controls electrical power; the BMS monitors and protects the battery and communicates its operating limits. 2、Does every energy storage system need an EMS? Not every installation uses a separate EMS. Coordination may be provided by another controller, depending on the system's size, equipment and operating requirements. 3、Are ATS and STS interchangeable? They both switch AC sources, but their switching technology, source requirements and transfer characteristics differ. Selection requires a project-specific design review. VGRID Power Technology Co., Ltd. is a company dedicated to the research and development, manufacturing, sales, and service of energy storage system PCS modules and optical reserve all-in-one machinesHigh tech enterprises. The company is located in GuangMing District, Shenzhen. The core team of the company originates from Emerson and has a senior, professional, and efficient team composition. The company focuses on the research and manufacturing of energy storage inverter PCS modules and optical reserve all-in-one machines, providing customers with standard products and PCS system solutions. The company adheres to customer centricity, with professionalism and service as the core, and provides customers with trustworthy products and services. # Wall-Mounted DC-Coupled Grid-Tied and Off-Grid System With "DC coupling and integrated grid-tied/off-grid operation" as its core concept, VGRID POWER introduces a new generation of wall-mounted solar-storage-charging solutions. Built around the dual core of **LEONA-H135K** and **LEONA-M200K**, the system redefines how distributed energy is connected — fewer cables, a smaller footprint, higher protection, and more flexible topologies — bringing integrated solar-storage-charging into commercial, industrial, and residential applications. Dual-Core Products: Leona-H135K & Leona-M200K The complete system consists of two wall-mounted core devices: the Leona-H135K handles AC-side power conversion and seamless grid-tied/off-grid switching, while the Leona-M200K handles DC-side PV conversion and battery dispatch. Together they form a complete, compact, and flexibly scalable DC-coupled grid-tied and off-grid system. [Leona-H135K · LEONA-H135K Wall-Mounted Grid-Forming Energy Storage PCS Protection Rating IP65 Installation Wall-mounted Overload Capability 125% Core Configuration Built-in STS / ATS dual AC inputs View Full Specifications →](/zh/product/leona-h135k) [Leona-M200K · LEONA-M200K Wall-Mounted DC Converter DCDC/MPPT Rated Power 200 / 150 kW Max. Efficiency 99.26% MPPT Channels 16 / 12 Protection Rating IP65 View Full Specifications →](/zh/product/leona-m200k) System Architecture: DC-Coupled, Multi-Terminal Coordination The system adopts a DC bus coupling architecture. PV is connected to the DC bus nearby through MPPT units; batteries, DC chargers, loads, the grid (GRID), and generators are dispatched in a unified manner through the PCS unit of the Leona-M200K. The AC side and DC side use an AC BUS / DC BUS dual-bus design, with an independent communication network, achieving a clear separation of energy flow and information flow. **DC-coupled system topology:** PV → MPPT → DC BUS → PCS → Grid / Generator / Battery / DC Charge / Load **Direct PV Connection:** Module DC power enters the system directly, eliminating the need for a conventional combiner box and reducing one stage of conversion loss. **Direct Battery Connection:** Cells/battery clusters connect directly to the DC bus for higher charge and discharge efficiency. **DC Fast Charging:** DC chargers draw power directly, avoiding repeated AC-DC conversion and reducing energy consumption and equipment costs. **Grid-Tied/Off-Grid Switching:** Grid-tied operation when the grid is normal, and millisecond-level off-grid power supply during grid faults, ensuring uninterrupted power for critical loads. Eight Core Advantages 01 Direct PV Connection, No Combiner Box Fewer equipment tiers, lower system cost and fewer failure points. 02 MPPT Deployed Nearby Trackers are placed close to the modules, significantly shortening DC cables and reducing line losses and installation costs. 03 Lightweight Wall-Mounted Structure No large lifting equipment required; a single person can install it, greatly improving transport and deployment efficiency. 04 AC/DC Bidirectional Charging Direct Connection Flexibly build charging systems at multiple voltage levels, adapting to complex conditions such as weak grids and phase-loss grids. 05 One-Cluster-One-Management & Parallel Connection Supports refined battery cluster management and centralized parallel expansion, flexibly matching different capacities and topologies. 06 Modular Independent Design Each functional unit is an independent module; a single-point failure does not affect overall operation, significantly reducing maintenance costs. 07 Built-In Dual AC Inputs Automatic switching between grid and diesel generator AC inputs without an external ATS module. 08 IP65 High Protection Rating Dust-proof and water-proof, suitable for outdoor, island, high-humidity, high-salt-spray, and other demanding application scenarios. Typical Application Scenarios With high integration and strong environmental adaptability, the Leona series wall-mounted DC-coupled grid-tied and off-grid system has been deployed at scale in multiple scenarios: Commercial and Industrial Rooftop Solar-Storage Integration Island / Weak-Grid Off-Grid Microgrid Solar-Storage-Charging Station (Integrated Solar-Storage-Charging) Industrial Park / Data Center Backup Power Mobile / Emergency Energy Support Distributed Microgrid Get a Customized Solution Now Whether you are planning a new solar-storage plant or upgrading an existing grid-tied and off-grid system, VGRID POWER can tailor the most suitable solution for you based on the Leona-H135K and Leona-M200K. Contact us to obtain product brochures, system configurations, and quotations. [Get a Quote](/zh/contact) [Browse Products](/zh/products) # Wall-Mounted DC-Coupled Grid-Tied and Off-Grid System With "DC coupling and integrated grid-tied/off-grid operation" as its core concept, VGRID POWER introduces a new generation of wall-mounted solar-storage-charging solutions. Built around the dual core of **LEONA-H135K** and **LEONA-M200K**, the system redefines how distributed energy is connected — fewer cables, a smaller footprint, higher protection, and more flexible topologies — bringing integrated solar-storage-charging into commercial, industrial, and residential applications. Dual-Core Products: Leona-H135K & Leona-M200K The complete system consists of two wall-mounted core devices: the Leona-H135K handles AC-side power conversion and seamless grid-tied/off-grid switching, while the Leona-M200K handles DC-side PV conversion and battery dispatch. Together they form a complete, compact, and flexibly scalable DC-coupled grid-tied and off-grid system. [Leona-H135K · LEONA-H135K Wall-Mounted Grid-Forming Energy Storage PCS Protection Rating IP65 Installation Wall-mounted Overload Capability 125% Core Configuration Built-in STS / ATS dual AC inputs View Full Specifications →](/zh/product/leona-h135k) [Leona-M200K · LEONA-M200K Wall-Mounted DC Converter DCDC/MPPT Rated Power 200 / 150 kW Max. Efficiency 99.26% MPPT Channels 16 / 12 Protection Rating IP65 View Full Specifications →](/zh/product/leona-m200k) System Architecture: DC-Coupled, Multi-Terminal Coordination The system adopts a DC bus coupling architecture. PV is connected to the DC bus nearby through MPPT units; batteries, DC chargers, loads, the grid (GRID), and generators are dispatched in a unified manner through the PCS unit of the Leona-M200K. The AC side and DC side use an AC BUS / DC BUS dual-bus design, with an independent communication network, achieving a clear separation of energy flow and information flow. **DC-coupled system topology:** PV → MPPT → DC BUS → PCS → Grid / Generator / Battery / DC Charge / Load **Direct PV Connection:** Module DC power enters the system directly, eliminating the need for a conventional combiner box and reducing one stage of conversion loss. **Direct Battery Connection:** Cells/battery clusters connect directly to the DC bus for higher charge and discharge efficiency. **DC Fast Charging:** DC chargers draw power directly, avoiding repeated AC-DC conversion and reducing energy consumption and equipment costs. **Grid-Tied/Off-Grid Switching:** Grid-tied operation when the grid is normal, and millisecond-level off-grid power supply during grid faults, ensuring uninterrupted power for critical loads. Eight Core Advantages 01 Direct PV Connection, No Combiner Box Fewer equipment tiers, lower system cost and fewer failure points. 02 MPPT Deployed Nearby Trackers are placed close to the modules, significantly shortening DC cables and reducing line losses and installation costs. 03 Lightweight Wall-Mounted Structure No large lifting equipment required; a single person can install it, greatly improving transport and deployment efficiency. 04 AC/DC Bidirectional Charging Direct Connection Flexibly build charging systems at multiple voltage levels, adapting to complex conditions such as weak grids and phase-loss grids. 05 One-Cluster-One-Management & Parallel Connection Supports refined battery cluster management and centralized parallel expansion, flexibly matching different capacities and topologies. 06 Modular Independent Design Each functional unit is an independent module; a single-point failure does not affect overall operation, significantly reducing maintenance costs. 07 Built-In Dual AC Inputs Automatic switching between grid and diesel generator AC inputs without an external ATS module. 08 IP65 High Protection Rating Dust-proof and water-proof, suitable for outdoor, island, high-humidity, high-salt-spray, and other demanding application scenarios. Typical Application Scenarios With high integration and strong environmental adaptability, the Leona series wall-mounted DC-coupled grid-tied and off-grid system has been deployed at scale in multiple scenarios: Commercial and Industrial Rooftop Solar-Storage Integration Island / Weak-Grid Off-Grid Microgrid Solar-Storage-Charging Station (Integrated Solar-Storage-Charging) Industrial Park / Data Center Backup Power Mobile / Emergency Energy Support Distributed Microgrid Get a Customized Solution Now Whether you are planning a new solar-storage plant or upgrading an existing grid-tied and off-grid system, VGRID POWER can tailor the most suitable solution for you based on the Leona-H135K and Leona-M200K. Contact us to obtain product brochures, system configurations, and quotations. [Browse Products](/zh/products) # Wall-Mounted DC-Coupled Grid-Tied and Off-Grid System With "DC coupling and integrated grid-tied/off-grid operation" as its core concept, VGRID POWER introduces a new generation of wall-mounted solar-storage-charging solutions. Built around the dual core of **LEONA-H135K** and **LEONA-M200K**, the system redefines how distributed energy is connected — fewer cables, a smaller footprint, higher protection, and more flexible topologies — bringing integrated solar-storage-charging into commercial, industrial, and residential applications. Dual-Core Products: Leona-H135K & Leona-M200K The complete system consists of two wall-mounted core devices: the Leona-H135K handles AC-side power conversion and seamless grid-tied/off-grid switching, while the Leona-M200K handles DC-side PV conversion and battery dispatch. Together they form a complete, compact, and flexibly scalable DC-coupled grid-tied and off-grid system. [Leona-H135K · LEONA-H135K Wall-Mounted Grid-Forming Energy Storage PCS Protection Rating IP65 Installation Wall-mounted Overload Capability 125% Core Configuration Built-in STS / ATS dual AC inputs View Full Specifications →](/zh/product/leona-h135k) [Leona-M200K · LEONA-M200K Wall-Mounted DC Converter DCDC/MPPT Rated Power 200 / 150 kW Max. Efficiency 99.26% MPPT Channels 16 / 12 Protection Rating IP65 View Full Specifications →](/zh/product/leona-m200k) System Architecture: DC-Coupled, Multi-Terminal Coordination The system adopts a DC bus coupling architecture. PV is connected to the DC bus nearby through MPPT units; batteries, DC chargers, loads, the grid (GRID), and generators are dispatched in a unified manner through the PCS unit of the Leona-M200K. The AC side and DC side use an AC BUS / DC BUS dual-bus design, with an independent communication network, achieving a clear separation of energy flow and information flow. **DC-coupled system topology:** PV → MPPT → DC BUS → PCS → Grid / Generator / Battery / DC Charge / Load **Direct PV Connection:** Module DC power enters the system directly, eliminating the need for a conventional combiner box and reducing one stage of conversion loss. **Direct Battery Connection:** Cells/battery clusters connect directly to the DC bus for higher charge and discharge efficiency. **DC Fast Charging:** DC chargers draw power directly, avoiding repeated AC-DC conversion and reducing energy consumption and equipment costs. **Grid-Tied/Off-Grid Switching:** Grid-tied operation when the grid is normal, and millisecond-level off-grid power supply during grid faults, ensuring uninterrupted power for critical loads. Eight Core Advantages 01 Direct PV Connection, No Combiner Box Fewer equipment tiers, lower system cost and fewer failure points. 02 MPPT Deployed Nearby Trackers are placed close to the modules, significantly shortening DC cables and reducing line losses and installation costs. 03 Lightweight Wall-Mounted Structure No large lifting equipment required; a single person can install it, greatly improving transport and deployment efficiency. 04 AC/DC Bidirectional Charging Direct Connection Flexibly build charging systems at multiple voltage levels, adapting to complex conditions such as weak grids and phase-loss grids. 05 One-Cluster-One-Management & Parallel Connection Supports refined battery cluster management and centralized parallel expansion, flexibly matching different capacities and topologies. 06 Modular Independent Design Each functional unit is an independent module; a single-point failure does not affect overall operation, significantly reducing maintenance costs. 07 Built-In Dual AC Inputs Automatic switching between grid and diesel generator AC inputs without an external ATS module. 08 IP65 High Protection Rating Dust-proof and water-proof, suitable for outdoor, island, high-humidity, high-salt-spray, and other demanding application scenarios. Typical Application Scenarios With high integration and strong environmental adaptability, the Leona series wall-mounted DC-coupled grid-tied and off-grid system has been deployed at scale in multiple scenarios: Commercial and Industrial Rooftop Solar-Storage Integration Island / Weak-Grid Off-Grid Microgrid Solar-Storage-Charging Station (Integrated Solar-Storage-Charging) Industrial Park / Data Center Backup Power Mobile / Emergency Energy Support Distributed Microgrid Get a Customized Solution Now Whether you are planning a new solar-storage plant or upgrading an existing grid-tied and off-grid system, VGRID POWER can tailor the most suitable solution for you based on the Leona-H135K and Leona-M200K. Contact us to obtain product brochures, system configurations, and quotations. [Browse Products](/zh/products) # Off-grid Energy Storage Microgrid What Is an Off-grid Energy Storage Microgrid An off-grid energy storage microgrid (Off-grid BESS Microgrid) is **an autonomous power system that does not rely on the public grid and independently completes the entire generation–storage–distribution–consumption process**. It consists of distributed generation sources (PV, diesel generators, and wind power where necessary), energy storage batteries, power conversion systems (PCS), distribution units and an energy management system (EMS), and externally behaves as an independent power source with self-established voltage and frequency. Compared with the common "PV + off-grid inverter" approach, the engineering difference between the two lies not in the inverter itself, but in **power balancing capability**. In a pure PV off-grid solution, PV output is uncontrollable and the load varies at any time, with no buffer in between, so balance can only be maintained by frequent diesel generator start/stop or direct load shedding, resulting in rapid genset wear, high fuel consumption and large voltage and frequency fluctuations. With energy storage added, the storage system simultaneously takes on three engineering roles: **Power buffering** — instantaneous power imbalances are absorbed or supplemented by the battery, allowing both the diesel generator and PV to operate under relatively stable conditions without having to follow the load with sharp adjustments; **Voltage and frequency reference** — the grid-forming PCS actively establishes the voltage amplitude and frequency reference, providing grid-connection conditions for grid-following equipment such as PV and gensets; **Energy time shifting** — surplus PV energy during the day is stored and released at night or on cloudy and rainy days, minimizing diesel generator operating hours. Simply put, an off-grid microgrid solves not "whether there is power", but **whether power can be supplied stably, economically and continuously without a grid**. System Architecture and Key Equipment A complete off-grid energy storage microgrid can be divided by function into four layers, each with different engineering responsibilities. 1. Generation Layer: PV as the Main Source, Diesel as the Backstop PV is the primary power source of an off-grid system, with the lowest levelized cost of electricity, no fuel dependency and low maintenance; the diesel generator provides backup for extended rainy periods. In engineering practice, the goal is generally not "zero diesel", but rather to set genset start/stop thresholds based on SOC (state of charge) and load forecasts, so that the genset intervenes only during prolonged low-irradiance periods while also taking battery cycle life into account. Energy collection on the PV side is handled by MPPT controllers. The VGRID POWER [SP200/150HAPV series PV MPPT controllers](/zh/product/leona-m200k) feature an IP65 wall-mounted design, support 16 PV inputs (SP200)/12 inputs (SP150), and offer buck-boost conversion capability with a maximum conversion efficiency of 99.26%. The significance of multiple MPPT channels lies in **resistance to shading and string mismatch** — when the array is partially shaded by buildings, vegetation or cloud shadows, each channel tracks its own maximum power point independently, preventing one mismatched channel from dragging down the output of the entire string. 2. Storage Layer: Capacity Determines Duration, Power Determines Load The basis for calculating battery capacity is the **longest continuous period without sunlight** and the **average daily electricity consumption**, rather than a simple estimate of "PV installed capacity × coefficient". On the power side, the maximum starting surge of loads must be calculated — the starting current of motors, water pumps and compressors can reach 5 to 7 times the rated value, and if the PCS does not have sufficient margin, it will trip immediately at startup. In a DC-coupled architecture, PV, batteries and the PCS share a DC bus, and voltage matching and energy routing must be completed through DCDC modules. The VGRID POWER [SP120/60HCPV and SP105HCDC series DCDC modules](/zh/product/sp120-60hcpv-sp105hcdc) adopt an isolated air duct design, achieve a maximum efficiency of 99.3%, accept a wide DC voltage input range and multiple PV inputs, support parallel connection of up to 15 units, and offer battery heterogeneity (SOC balancing) capability — when expanding an existing battery bank or mixing cells from different batches, this capability can significantly reduce consistency risks. 3. Conversion Layer: The Power Conversion System (PCS) Is the Core of the System The PCS performs bidirectional conversion between DC and AC and establishes voltage and frequency in off-grid mode. Off-grid scenarios place the highest demands on the grid-forming capability of the PCS, because there is no large grid in the system to provide a reference, and the PCS must take over the role of a synchronous generator. VGRID POWER offers a range of grid-forming models for different power levels and installation conditions: **[LEONA-H135K series microgrid energy storage PCS](/zh/product/leona-h135k)** — IP65 high-protection wall-mounted unit with a built-in on/off-grid transfer device and ATS dual AC input module, supporting diesel genset hybrid operation and parallel connection of multiple units, with a maximum bypass current of 230 A. Its ATS dual AC input design allows two power sources — "mains (if available) + diesel generator" — to complete transfer and interlocking within the same device, simplifying the system's primary circuit. **[SP125HCPS series microgrid energy storage PCS](/zh/product/sp125hcps)** — aimed at small and medium-sized energy storage microgrids, supporting DC/AC coupling, with an optional model featuring a built-in STS (transfer time <10 ms), maximum efficiency of 98.5%, 125% overload capability and independent three-phase grid-connection control, and supporting heterogeneous battery connection. **[SP60/50/40/30HCG2 series hybrid inverters](/zh/product/sp60-50-40-30hcg2)** — with isolated air ducts and a wide DC voltage, high-current design, compatible with 280/314 Ah cells, built-in STS seamless transfer, support for dual MPPT channels, diesel genset hybrid operation and parallel connection of multiple units, 150% overload capability and maximum efficiency of 98.2%, suitable for small and medium-power distributed installations. If the on/off-grid transfer on the AC bus needs to be a separate module, the optional [STS200/400/600 series static transfer modules](/zh/product/sts200-400-600) are available: transfer time <20 ms, seamless on/off-grid transfer, integrated grid-side/load-side bidirectional detection, LocalEMS and multiple communication interfaces including RS485/CAN/4G, and compatibility with on/off-grid transfer standards of multiple countries. 4. Management Layer: The EMS Determines Actual Returns and Battery Life The EMS is responsible for dispatch strategies: whether PV supplies the load first or charges the battery first, at what SOC the genset starts, what depth of discharge to maintain, and how power is shared when multiple units operate in parallel. The strategy directly determines three core indicators: fuel consumption, battery cycle life and system availability. The EMS built into VGRID POWER all-in-one products supports strategies such as peak shaving and valley filling, reverse power prevention and diesel-PV hybrid operation, and can be connected to upper-level monitoring via communication interfaces. Three Typical Configuration Forms In engineering practice, off-grid microgrids are divided into three forms by power level and degree of integration. When selecting, first determine the form, then the capacity. Form 1: All-in-One — First Choice for Small and Medium-sized Scenarios The PCS, MPPT, EMS, on/off-grid transfer switch, and AC/DC distribution units are integrated into a single cabinet, and on site only four interfaces need to be connected: PV, battery, load and diesel generator. The advantages are reduced design workload, a small footprint and fast commissioning. VGRID POWER's flagship model is the [SP250HAG2T PV-storage on/off-grid all-in-one unit](/en/product/sp250hag2t): it integrates the PCS, MPPT, EMS, PCM on/off-grid transfer switch, AC/DC distribution units, genset control, surge protective devices and a built-in isolation transformer, and supports connection of diesel generators, PV and batteries. Its fast on/off-grid transfer time is 10 ms, its multi-channel DC-coupled charging efficiency is greater than 99.3%, it supports diesel genset hybrid operation and grid-forming operation, and can be expanded in capacity through parallel connection of multiple units. It is suitable for PV-storage-diesel microgrids and diesel-storage backup power sources for mines, among other scenarios. If the project has additional requirements for voltage level or electrical isolation, the [SP250HAG2T series (built-in isolation transformer variant)](/zh/product/sp250hag2t) can be selected, with the isolation transformer built into the cabinet, eliminating the need for separate on-site step-up/isolation equipment. Form 2: Series All-in-One — Medium and Large Power Scenarios When loads reach hundreds of kilowatts to the megawatt level, larger power units and a higher protection rating are required. The [SP375/500HAG2 series PV-storage on/off-grid all-in-one units](/zh/product/sp375-500hag2) integrate the PCS, MPPT, EMS, PCM on/off-grid transfer switch and AC/DC distribution units into one unit, with IP54 protection, charging efficiency >99.3%, fast on/off-grid transfer <20 ms, support for diesel generator/PV/battery connection, built-in EMS strategies for peak shaving and valley filling, reverse power prevention and diesel-PV hybrid operation, and support for parallel connection of multiple units. Form 3: All-in-One Cabinet — Emergency Power and Construction For scenarios requiring high-power centralized supply and rapid deployment, the [SP750H54PSTD all-in-one cabinet](/zh/product/sp750h54pstd-2) provides 750 kVA of power per cabinet, integrating the PCS, EMS, isolation transformer and AC/DC distribution units internally, with an optional external STS (transfer time ≤20 ms), support for grid, diesel generator and battery connection plus a built-in PV connection switch, IP54 high protection, and support for parallel connection of multiple cabinets. It is suitable for emergency power, diesel-storage and construction site scenarios. Capacity Design: Calculate Energy First, Then Power Capacity design for off-grid projects has two independent objectives that must be calculated separately. Step 1: Determine Battery Capacity Based on Daily Electricity Consumption Calculate the average daily electricity consumption (kWh) and the longest continuous period without sunlight (days of autonomy). The usable battery capacity must satisfy: Usable capacity ≥ average daily electricity consumption × days of autonomy ÷ system efficiency Depth of discharge (DOD) is generally kept at 80%–90%; under a lithium iron phosphate system, prolonged full charge/discharge should be avoided System efficiency must account for PCS conversion losses, DCDC losses and line losses; the engineering value is typically 85%–92% Step 2: Determine PCS Power Based on Load Characteristics Calculate the total rated load power and the maximum simultaneity factor to obtain the steady-state power demand; Separately calculate the starting current of inductive loads (motors, water pumps, compressors, air conditioners), and verify by superimposing the largest single startup surge on the remaining steady-state loads; Reserve 20%–30% power margin for future load growth and power sharing margin during parallel operation of multiple units. For example: a village in Africa consumes an average of 240 kWh per day, requires 1 day of autonomy, and the system efficiency is taken as 0.9, so the usable capacity must be ≥ 240 × 1 ÷ 0.9 ≈ 267 kWh; if daytime PV is sufficient to cover most of the load, the actual configuration can be moderately reduced in combination with the PV output curve. On the power side, if several water pump motors total 120 kW with a maximum of 45 kW for a single unit, verified at 6 times the starting current and taking the simultaneity factor into account, the PCS selection must be above 150 kW with sufficient overload capability. Typical Application Scenarios Island Microgrids Independent power supply for Southeast Asian islands, replacing high-cost diesel generation, with salt-spray protection and typhoon-resistant design requirements African Village Microgrids PV-diesel-storage hybrid microgrids providing basic electricity to areas without power, with low O&M requirements and remote monitoring capability African Mining Microgrids Mine loads are large and highly surge-prone, requiring PCS overload capability to be verified against heavy-load startup Oilfield Production Microgrids Pumping units are cyclic surge loads; coordinated PV, diesel and storage can significantly reduce diesel consumption Middle East Villa Microgrids Stable power assurance for high-end residential and commercial scenarios, accommodating high-power loads such as air conditioning Remote Farms and Pastoral Areas Productive loads such as irrigation pumps and feed processing, with long supply radii and prone to voltage drop at the far end Mobile Energy Storage Vehicles Flexible emergency and temporary power supply for repairs, construction and large events Communication Base Stations and Border Posts Small capacity, long-duration operation, with the focus on reliability, maintenance-free operation and remote alarms Key Engineering Implementation Points 1. Load Classification and Supply Assurance Boundaries An off-grid system must clearly define "which loads must be assured". They are usually divided into three levels: Level 1 covers critical loads such as lighting, communications, medical care and security; Level 2 covers productive loads; Level 3 covers interruptible loads (such as some air conditioning and non-critical processing equipment). Capacity configuration is based on Level 1 + Level 2, and Level 3 loads are actively shed by the EMS when battery SOC is low, preventing a total site power outage. 2. Grounding Configuration and Protection Settings An off-grid system has no grounding reference provided by the grid side, so the grounding configuration must be determined at the design stage. A common practice is to solidly ground or impedance-ground the neutral point on the AC side of the PCS, and to provide independent residual current protection and insulation monitoring. Surge protection must cover both the PV DC side and the AC side; all-in-one products usually have built-in surge protective devices, but on-site down conductors and grounding resistance still need to be calculated separately. 3. Parallel Operation of Multiple Units and Power Sharing When capacity exceeds that of a single unit, multiple units are connected in parallel. Three points require attention in engineering: whether the parallel-operation protocols of the models are consistent, whether the communication links are redundant, and whether the power sharing strategy is equal sharing or master-slave. Several VGRID POWER models (SP250HAG2T, SP375/500HAG2, LEONA-H135K, SP125HCPS, SP60HCG2) support parallel connection of multiple units; when expanding, models of the same series and power rating should be preferred to avoid circulating currents and dispatch complexity caused by mixed-model parallel operation. 4. Environmental Adaptability and Protection Rating Outdoor deployment requires selecting the protection rating according to site conditions: IP65 is suitable for wall-mounted installation positions requiring rain and dust protection (LEONA-H135K, SP200/150HAPV); IP54 is suitable for all-in-one cabinets (SP375/500HAG2, SP250HAG2T). In high-temperature, high-humidity and high-salt-spray areas, isolated air duct designs should also be considered (SP60HCG2 and SP120/60HCPV both use isolated air ducts) to slow the aging of electronic components. 5. Commissioning and Acceptance Commissioning in the following order is recommended: first verify voltage and frequency output with a single unit under a dummy load, then connect PV to verify MPPT tracking and power limiting logic, then connect the battery to verify charge/discharge switching and SOC calibration, and finally connect the diesel generator to verify hybrid start/stop and on/off-grid transfer. Acceptance should focus on measured transfer time, steady-state voltage deviation, frequency fluctuation range, harmonic distortion rate and genset startup success rate. Frequently Asked Questions Q: Does an off-grid system always need a diesel generator? Not necessarily, but keeping one is recommended. If local sunlight conditions are stable and the days-of-autonomy requirement is not high, a pure PV-storage configuration can be feasible in some projects; once prolonged rainy weather occurs, a pure PV-storage system can only respond by increasing battery capacity or shedding load, and the marginal cost of increasing battery capacity is often higher than that of installing a small diesel generator. The common engineering practice is "PV-storage as the main source, diesel as the auxiliary", with the genset capacity selected according to the steady-state power of Level 1 loads, without needing to be sized for the site's peak demand. Q: Is a larger battery capacity always safer? No. Oversized capacity raises the initial investment on the one hand, and on the other hand the battery operating in a low SOC range or under shallow cycling for long periods can actually worsen consistency differences within the battery bank. Capacity should be calculated precisely based on days of autonomy and daily electricity consumption, with a reasonable SOC operating window reserved. Q: What is the point of on/off-grid transfer in an off-grid system? Many so-called "off-grid" projects are actually "weak grid" or "intermittent supply" scenarios — mains power during the day and outages at night, or fixed outages of several hours each week. Such projects must use on/off-grid models, with the PCS performing bidirectional transfer; pure off-grid models cannot feed back into the grid, nor can they automatically switch back when the grid is restored. Q: Will PV output fluctuations cause unstable voltage and frequency? This is precisely the core value of the energy storage system. The grid-forming PCS establishes the voltage and frequency reference, the battery provides instantaneous power support, PV fluctuations are absorbed by the storage system, and the load side does not perceive them. If grid-following equipment is used without energy storage, PV fluctuations will be transmitted directly to the load. Q: Can the equipment be operated and maintained remotely? Yes. VGRID POWER products generally support RS485/CAN/4G communication interfaces and can upload operating data to a monitoring platform, enabling remote viewing of SOC, charge/discharge power, alarm status and fault records. For projects with inconvenient transportation such as islands and mining areas, remote O&M capability is key to reducing lifecycle costs. Project Photos Contact Us For island, village, mining, oilfield, farm or emergency power supply scenarios, VGRID POWER can provide a complete off-grid energy storage microgrid solution from capacity calculation, solution design and equipment selection to commissioning and delivery. You are welcome to contact us for solution design and quotations. # Grid-connected commercial and industrial energy storage Grid-tied C&I Energy Storage · Peak-Valley Arbitrage and Demand Management Grid-Tied C&I Energy Storage: Turning Peak-Valley Price Spreads and Demand Charges into Measurable Returns **Grid-tied C&I energy storage is a storage system connected on the commercial and industrial distribution side. It does not change the electricity consumption itself, but changes the "time" and "rate" of consumption.** VGRID POWER's solution consists of three parts: the power conversion system (PCS), the battery system and the energy management system (EMS). Its typical value comes from four things: peak-valley price spread arbitrage, demand charge management, local PV self-consumption, and demand response and ancillary services. The success of such projects often lies not in the equipment itself, but in **whether the capacity configuration matches the revenue structure** — many projects fail because they are quoted by capacity alone without accounting for usable energy, or because demand control is treated as scheduled charging and discharging. **99.26%**Maximum efficiency of PV MPPT controller **-1~1**Adjustable power factor range **<3%**Current harmonics (load >30%) **125%**Grid-tied unbalance tolerance Where the Returns Come From The revenue structure determines the capacity configuration. First work out the four revenue streams clearly, then work backwards to how much power and how much energy are needed. ① Peak-Valley Price Spread Arbitrage C&I electricity tariffs generally have a peak-valley price spread. Energy storage charges during valley periods and discharges during peak periods, converting the "price difference" into cash flow from the "energy difference". The ceiling for price spread arbitrage is determined by the **length of the charge and discharge windows**: the shorter the window, the fewer cycles the same capacity can perform each day, and the annual revenue is naturally limited. Suitable for: provinces and time periods with a clear two-tier price spread Key variables: peak period duration, valley period duration, depth of charge and discharge VGRID POWER's all-in-one cabinet has built-in peak shaving and valley filling and self-consumption strategies ② Demand Charge Management C&I electricity tariffs usually include a "maximum demand" billing item, charged on the **peak** of the 15-minute average power. A single occasional startup surge can push up the basic electricity charge for the entire month. Energy storage can discharge to cover the load spike before it arrives, flattening the demand peak. The leverage of this revenue stream is very high — shaving off a 100 kW peak produces an immediate saving on the annual basic electricity charge. Suitable for: factories with large load fluctuations and high-power surge equipment Key variables: demand billing method (15-minute / 30-minute window) Key variables: the shape of the load curve, not the average power ③ Local PV Self-Consumption After commercial and industrial rooftop PV is installed, midday output often exceeds the load. If the surplus power is fed to the grid, the price is low and it may be limited by the connection capacity. Energy storage shifts this power to the evening peak or the next day, achieving **self-consumption**. VGRID POWER's all-in-one cabinet has a built-in anti-backflow strategy to avoid reverse power flow. Suitable for: enterprises with large rooftop PV capacity and loads concentrated during the day Key variables: the degree of time mismatch between the PV output curve and the load curve EMS functions: self-consumption, surplus power to grid, anti-backflow ④ Demand Response and Ancillary Services In markets where conditions permit, energy storage can also participate in demand response or frequency regulation ancillary services, forming an additional revenue channel. This revenue stream depends on local market rules and **should be explicitly stated in the contract as not being part of the base revenue**, and should only be counted when it can be confirmed. Suitable for: regions with clear demand response compensation standards Key variables: market access conditions and compensation unit price Recommendation: treat as incremental revenue, not included in the base payback period System Composition: Three Components PCS Power Conversion System: The Bidirectional Power Hub for Grid-Tied and Off-Grid The PCS handles the bidirectional conversion between DC and AC, determining whether the system can connect to the grid, provide backup power, and respond to voltage fluctuations. VGRID POWER's C&I models have an adjustable power factor between -1 and 1, supporting reactive power compensation; current harmonics are kept below 3% when the load exceeds 30%. [SP125HCPS series microgrid energy storage PCS](/zh/product/sp125hcps) is rated at 125 kVA with a maximum efficiency of 98.5%, and is available in a version with a built-in STS (switching time <10 ms); [SP60/50/40/30HCG2 series hybrid inverters](/zh/product/sp60-50-40-30hcg2) cover 30–60 kVA, are compatible with 280/314 Ah cells, and offer 150% overload capability, suitable for small and medium-power distributed installations. Battery Battery System: Balancing Energy and Lifespan Battery capacity determines the dispatchable energy, while the C-rate and thermal management determine the output power. C&I scenarios typically operate at a C-rate of 2C or below, and lithium iron phosphate systems best match in terms of cycle life and safety. What needs attention is **battery consistency and the SOC window**: although long-term shallow charging and discharging is friendly to lifespan, if poorly managed it will aggravate differences within the pack. The all-in-one cabinet's built-in SOC balancing strategy is designed precisely for this. EMS Energy Management System: The Stage Where Returns Are Realized The EMS determines the charge and discharge sequence, and is the key to turning revenue from paper into cash. Functions typically include peak shaving and valley filling, demand control, PV self-consumption, anti-backflow, SOC balancing and cloud platform access. VGRID POWER's all-in-one cabinet has the above strategies built in, and can upload operating data to the platform via RS485/CAN/4G interfaces, facilitating unified monitoring of multiple systems in a park. **DC-side accessories**: In DC-coupled solutions, the [SP210HCDC DC controller](/zh/product/sp210hcdc) and the [SP120/60HCPV, SP105HCDC DCDC modules](/zh/product/sp120-60hcpv-sp105hcdc) handle the voltage integration of PV and batteries, with maximum efficiencies of 99.2% and 99.3% respectively, and support parallel connection of multiple units. **PV-side accessories**: The [SP200/150HAPV PV MPPT controller](/zh/product/leona-m200k) is IP65 wall-mounted, with an MPPT voltage range of 200 V–900 V. Multiple MPPT channels can separately track strings with different orientations or different degrees of shading. **Switching modules**: If independent grid-tied/off-grid switching or backup power is required, the [STS200/400/600 static transfer modules](/zh/product/sts200-400-600) provide <20 ms switching, compatible with the grid-tied/off-grid switching standards of multiple countries. VGRID POWER Grid-Tied Energy Storage Product Portfolio Covers 30 kVA to 750 kVA, with wall-mounted, all-in-one or all-in-one cabinet options according to site conditions. [SP60/50/40/30HCG2 Hybrid inverter (small and medium-power C&I) Rated power (grid-tied) 60/50/40/30kVA Maximum efficiency 98,2% Overload capability 150% Grid voltage range -20%~+15% Current harmonics (load>30%) 30%） View full specifications →](/zh/product/sp60-50-40-30hcg2) [SP125HCPS Microgrid energy storage PCS (optional built-in STS) Rated power (grid-tied) 125kVA Maximum efficiency 98,5% Switching time 99,3% Parallel units 3 Protection rating IP54/IP20 View full specifications →](/zh/product/sp375-500hag2) [SP200/150HAPV PV MPPT controller (DC-side accessory) Rated power 200kW / 150kW MPPT voltage range 200V-900V Maximum efficiency 99,26% Protection rating IP65 Installation method Pared View full specifications →](/zh/product/leona-m200k) [SP210HCDC Rack-mounted DC controller (DCDC) Rated power 210kW Input-side voltage range 200V-950V Maximum input current 300A Maximum efficiency 99,2% Parallel connection of multiple units Admitido View full specifications →](/zh/product/sp210hcdc) How to Calculate Capacity Configuration Three steps: first determine the power window, then determine the energy revenue, and finally verify and correct. Step 1: Power Capacity — Determined by the Charge and Discharge Windows Record the start and end times of the peak and valley periods on a typical day, and calculate the available charge and discharge window durations The grid-tied power is usually taken as the maximum charge and discharge amount that can be completed within the window, with a 10%–20% margin Also account for the transformer capacity: the charging current during the same period also occupies the distribution transformer load Step 2: Energy Capacity — Determined by Price Spread Revenue and Return on Investment Estimate annual revenue as "cycle depth × daily cycles × days × price spread" Then work backwards from the target payback period to the allowable initial investment, and divide by the system unit price to get the required capacity Demand management revenue should be calculated separately and not simply added to arbitrage revenue Step 3: Verification and Correction After completing the first two steps, go back and check three things: whether the **transformer** still has margin to handle the charging current; whether **fire protection and site conditions** are satisfied (there are clear requirements for battery compartment spacing, ventilation and fire suppression configuration); and whether the **revenue model** uses only static parameters. C&I electricity tariffs often have tiered rates and adjustments to peak and valley periods, so the revenue calculation should leave a margin for deviation. Annual arbitrage revenue (CNY) ≈ capacity (kWh) × daily cycles × days × cycle depth × (peak price − valley price) Annual demand revenue (CNY) ≈ shaved demand peak (kW) × basic electricity price (CNY/kW·month) × 12 Payback period (years) ≈ initial investment ÷ (annual arbitrage revenue + annual demand revenue + other revenue) Example: 100 kWh, 1 cycle per day, 90% depth, peak-valley spread of 0.9 CNY/kWh, annual demand revenue of 20,000 CNY → annual revenue ≈ 100×1×365×0.9×0.9 + 20000 ≈ 49,600 CNY Core Pain Points: Rural Distribution Area Voltage and PV Consumption At the end of the distribution network, distribution area transformers commonly suffer from the problem of "high voltage at noon, and voltage exceeding limits due to reverse PV feed-in from end users". With the growth of rural distributed PV installations, some low-voltage distribution areas show obvious voltage problems: when PV output is high at noon, the end-of-line voltage may exceed the +7% upper limit specified in GB/T 12325; and in the evening when the load drops and the energy storage has not yet discharged, the voltage sinks rapidly again. Causes Why Voltage Problems Occur in Distribution Areas Low-voltage lines have relatively high impedance. The voltage drop caused by power flowing through the line, superimposed on the reverse power flow, amplifies the voltage deviation at the end of the line. This is difficult to solve economically with pure AC voltage regulation means. Storage What Role Energy Storage Plays Energy storage absorbs surplus power when PV output is high at noon and releases it during the evening load peak, which is equivalent to shifting "uncontrollable PV output" to "the time when electricity is used". This solves two problems at once: PV consumption and voltage limit violations. Products VGRID POWER's Corresponding Models [SP60/50/40/30HCG2 hybrid inverters](/zh/product/sp60-50-40-30hcg2) are wall-mounted, with 150% overload capability and compatibility with 280/314 Ah cells, suitable for small-capacity, high-frequency dispatch conditions at the distribution area level; [LEONA-H135K series microgrid energy storage PCS](/zh/product/leona-h135k) has IP65 protection and a maximum bypass current of 230 A, with built-in ATS dual AC inputs, suitable for outdoor distribution area locations with high humidity and strict protection requirements. Typical Application Scenarios Peak-Valley Arbitrage Energy Storage Standalone energy storage configuration, using the two-tier price spread to complete daily cycles, suitable for provinces with a clear peak-valley price spread. Factory Energy Storage Microgrid For manufacturing enterprises with large load fluctuations, peak shaving through demand management significantly reduces the basic electricity charge. C&I PV + Storage Integrated rooftop PV + energy storage configuration, increasing the self-consumption ratio and reducing surplus power feed-in and capacity constraints. PV Arbitrage with Storage Providing storage solutions for existing PV plants or plant investors, alleviating consumption pressure. Distribution Area Energy Storage Voltage management and PV consumption in rural low-voltage distribution areas, mainly using wall-mounted small-capacity models. Commercial Buildings and Parks Unified dispatch in multi-user park scenarios, enabling combined optimization of peak shaving and valley filling and demand control. Data Centers and Production Line Backup Power Balancing arbitrage and backup power, with one system covering both economic operation and guaranteed supply for critical loads. Charging Station Supporting Energy Storage Alleviating the impact of charging loads on the distribution transformer, reducing distribution capacity costs while shaving peaks and filling valleys. Design Points and Common Misconceptions ① Quoting by Capacity Alone Without Accounting for Usable Energy Nominal capacity does not equal usable energy. The actual usable value is affected by the SOC operating window, depth of discharge and temperature. The contract should clearly define the definition of usable energy and the test conditions, otherwise the payback period calculation will be systematically optimistic. ② Ignoring the Occupancy of the Transformer by Charging The charging current and the production load current run through the same line and the same transformer. Although the load is low during valley periods, the transformer still has capacity constraints. When accounting, the charging current should be superimposed on the other loads during that period. ③ Treating Demand Control as Scheduled Charging and Discharging Demand control is **closed-loop control that follows load peaks**, not action according to a fixed timetable. If the load peak time drifts while the charge and discharge schedule is fixed, the actual peak still exists. The EMS needs real-time load tracking capability. ④ Ignoring Fire Protection and Site Conditions There are clear regulatory requirements for the spacing of battery compartments, ventilation conditions and fire suppression system configuration. Retrofitting old factory buildings often gets stuck on site conditions rather than equipment selection, and this item should be verified at the early design stage. ⑤ Calculating Only the Static Payback Period C&I electricity tariffs fluctuate due to policy adjustments and changes in peak and valley periods; batteries have capacity degradation; equipment has a degradation curve. It is recommended to calculate based on conservative electricity prices and conservative cycle counts, and to provide a 3–5 year cash flow scenario. Project Photos C&I energy storage station PCS cabinets in parallel arrangement Battery compartment and fire protection configuration Rooftop PV with storage Park energy storage station Grid-tied switching and protection Distribution room connection Frequently Asked Questions Can grid-tied energy storage supply power during a grid outage? It depends on the equipment configuration. A pure grid-tied PCS will shut down immediately after a power loss (required by anti-islanding protection) and cannot continue to supply power. To have backup power capability, a model that supports grid-tied/off-grid switching must be selected — VGRID POWER's SP125HCPS is available in a version with a built-in STS (switching <10 ms), and the SP250HAG2T / SP375/500HAG2 active switching can reach 0 ms. If only critical loads need to be backed up, an independent STS200/400/600 switching module can also be optionally configured. Can energy storage replace transformer capacity expansion? Under specific conditions it can alleviate the issue, but it usually cannot fully replace it. Transformer capacity expansion solves the problem of the capacity ceiling, while energy storage solves the problem of the load curve shape. For short-duration surge loads or superimposed peak usage scenarios, capacity expansion is still needed; but for loads that "peak during the day and sit idle at night", the capacity release brought by energy storage replacing peak shaving may avoid a capacity expansion investment. The specifics need to be verified in combination with the load curve and the short-circuit capacity of the connection point. Can one unit do both arbitrage and backup power at the same time? Yes, but the priority needs to be clearly defined. A model that supports grid-tied/off-grid operation performs arbitrage under normal conditions and automatically switches to off-grid mode to supply critical loads during a power outage. In engineering practice, an SOC lower limit is usually set (for example, 30%), below which it does not participate in discharge dispatch, in order to preserve backup power capability. This lower limit value needs to be clearly defined in the contract and during commissioning, otherwise the backup time will be shorter than expected. How long is the typical investment payback period? It depends on the peak-valley price spread, the basic electricity price, local subsidy policies and the initial investment unit price. When calculating, it is recommended to use conservative conditions: use the current price spread rather than the expected price spread, account for annual battery capacity degradation, and include subsidies only according to verifiable policies. VGRID POWER provides revenue calculations based on actual load curves, and will list the assumptions together with the quotation, making it easier for both parties to align expectations. Want to know how much your project can save on electricity bills? Provide your company's electricity consumption curve for the past 12 months and peak-valley period information, and VGRID POWER can complete the capacity configuration, revenue calculation and equipment selection accordingly, and provide an actionable grid-tied energy storage solution. [Get a Revenue Calculation and Solution](/zh/contact) # Distributed microgrid solutions Distributed Microgrid Solutions · Multi-Node Autonomy and Coordination Distributed Microgrids: Organizing Dispersed PV, Storage and Loads into One Dispatchable Whole The biggest difference between a distributed microgrid and a single-point microgrid is **more nodes, fragmented ownership and a longer dispatch chain**. A single industrial park may have a dozen distributed PV-plus-storage units owned by different parties, each with a different interconnection capacity, and when voltage fluctuates or one unit fails, someone has to coordinate the whole system. VGRID POWER's distributed solution turns each node into a micro source that can run independently, with a station-level EMS orchestrating them as a whole: **fault isolation, layered power, local consumption, off-grid self-healing**. **99.3%**DC-coupled charging efficiency **0ms**All-in-one active transfer **99.26%**PV MPPT peak efficiency **3 units**Parallel capability per model How Distributed Microgrids Differ from Single-Point Microgrids A single-point microgrid is usually built around one large-capacity storage unit, with a limited supply radius; a distributed microgrid organizes multiple dispersed resources into a mesh structure that can support one another. Understanding this difference is the prerequisite for equipment selection and dispatch design. Single point Built around one large-capacity unit One equipment room, one PCS, one battery bank; the supply radius is limited by cable length and voltage drop. Suitable for a single plant or a single park, but once that unit is taken offline for maintenance, the whole system stops. A fault affects the entire system; capacity expansion requires a shutdown and retrofit. Distributed Multiple nodes supporting one another Each node is a micro source that can run independently, coordinated through the station-level EMS. When one node fails, the others continue supplying power and carry its load; the supply radius is determined by the network topology rather than by a single unit. Faults are isolated within the node; capacity expansion proceeds incrementally by paralleling units or adding nodes. Ownership Multiple owners, multiple contracts The park's PV may belong to Company A, the storage to Company B, and the charging piles to the property manager. A distributed microgrid must account for metering, settlement and control authority separation at the design stage, rather than patching them in after commissioning. A common approach: energy and money are settled per contract, control commands are issued uniformly by the EMS, and physical isolation is achieved through switches and protection. System Layers: From Nodes to Station-Level Dispatch The dispatch logic of a distributed microgrid must be layered; otherwise you get the confusion of station level and node level competing for power. The four layers below are the recommended division. Layer 4 Station-level dispatch layer Determines how much power the site exchanges with the grid and how it is allocated among nodes. Constraints come from the interconnection capacity and the power purchase agreement. The station-level EMS is the only layer authorized to issue power commands; node level must not change the interconnection point power flow on its own. Layer 3 Node control layer Within each node, determines how PV, battery and local loads work together, responds to station-level commands and executes peak shaving, power limiting and voltage balancing locally. Transfer logic and protection logic are completed at this layer, so the transfer response time is essentially determined by the detection and switching action of the equipment inside the node. Layer 2 Equipment layer The control cycles of the PCS, DC controller, MPPT, battery and STS are typically in the millisecond to hundred-millisecond range. The job of this layer is to translate the minute-level commands from above into real-time power and current curves, and to report operating status and alarms faithfully. Layer 1 Measurement and protection layer Meters, sampling and protection relays form the factual basis. The data at this layer determines the quality of dispatch decisions and the speed of fault location. In a multi-node system, it is recommended that each node have its own power quality recorder rather than sharing one across the whole site. VGRID POWER Distributed Microgrid Products Select by node scale. PV input goes through MPPT or a DC controller, storage is connected via an all-in-one unit or DC module, switching between nodes is handled by the STS, and when capacity is insufficient, multiple units are paralleled. [SP375/500HAG2 Series PV-Storage All-in-One Rated power (grid-tied) 375/500kVA PV input 120kW × 3/4 Charging efficiency >99.3% Active transfer 0ms Protection rating IP54 / IP20 View full technical specifications →](/zh/product/sp375-500hag2) [SP250HAG2T-2 PV-Storage All-in-One Rated power (grid-tied) 250kVA Max output (off-grid) 275kW Max battery current 200A × 2 PV power 60kW × 2 Protection rating IP54 / IP20 View full technical specifications →](/en/product/sp250hag2t) [SP210HCDC DC Controller Rated power 210kW Input voltage range 600-1000V Max input current 220A Peak efficiency 99.2% Parallel operation 6 units View full technical specifications →](/zh/product/sp210hcdc) [SP200/150HAPV PV MPPT Controller Rated power 200/150kW MPPT voltage range 200-900V Peak efficiency 99.26% Protection rating IP65 Installation Wall View full technical specifications →](/zh/product/leona-m200k) [STS200/400/600 Static Transfer Module Rated capacity 200/400/600kW Max AC current 330/660/1000A Transfer time 99.3% Parallel operation Supported View full technical specifications →](/zh/product/sp120-60hcpv-sp105hcdc) The table above shows typical configurations. Actual selection requires the site single-line diagram, load curves and measured data at the interconnection point; VGRID POWER can produce a complete selection report based on these. Four Key Autonomous Capabilities These capabilities are not add-on features; they are what distinguishes a distributed microgrid from "a bunch of networked equipment." To judge whether a solution truly has distributed capability, check whether these four hold up independently. 01 Fault isolation When a single node fails, that node's protection device trips to isolate it, and the station-level EMS redistributes power among the remaining nodes so supply is not interrupted. This requires each node's protection settings to be coordinated independently; they cannot share a single set. 02 Layered power Critical loads are supported locally by storage first, secondary loads are shed during peak hours, and PV is fully self-consumed first, with only the surplus exported. This order must be defined explicitly; an implicit default will shed the wrong loads at the critical moment. 03 Local consumption DC coupling lets PV and batteries exchange directly on the DC side, reducing one power conversion stage; station-level dispatch lets each node's surplus energy first supply nodes on the same network segment that are short on power, rather than sending it all back to the grid. The returns of a multi-node system come mainly from this. 04 Off-grid self-healing After a grid outage, the station-level EMS drives each node's transfer device to switch to off-grid operation upon detecting the loss of power, storage establishes the voltage and frequency reference, and loads are then restored in a preset priority order. The restoration sequence depends directly on whether each node has off-grid output capability, which must be confirmed at the design stage. Dispatch, Metering and Communication Eighty percent of the O&M experience in a multi-node system depends on how well this layer is done. It does not change the hardware selection, but it determines whether on-site staff face clear data or a pile of alarms every day. Scope of responsibility of the station-level EMS The station-level EMS handles interconnection point power flow control, power allocation among nodes, execution of peak-shaving strategies and generation of external settlement data. Equipment-level MPPT tracking and current loop control belong to the node layer; the station level should not and need not duplicate them. If this boundary is not drawn clearly, the system will be unstable because two sets of logic compete for control. Metering and settlement In multi-owner scenarios, it is recommended to meter independently at each node's interconnection point, with the station level only aggregating rather than calculating on behalf of others. This way, even if the parties' contract terms differ, settlement data can still be traced back to a specific node. Communication architecture Nodes and the station level communicate via RS485 or Ethernet, reporting upward level by level; the station level connects externally to the monitoring platform via 4G or wired links. VGRID POWER equipment generally supports RS485/CAN and 4G, so on-site networking is not a bottleneck. Note that communication only carries monitoring and strategy delivery; **it cannot serve as a protection channel**—protection must be performed independently by hardware protection devices. Authority management for off-grid and grid-tied modes Off-grid transfer affects personnel safety, so authority must be tightly controlled. Transfer commands should only accept hard contacts from the station-level EMS or authenticated communications, and a local panel should be provided as an emergency bypass. Avoid letting commands from any source trigger a transfer. Typical Application Scenarios Multi-node microgrid in an industrial park A park has PV and storage owned by multiple parties and needs to prioritize self-consumption under a limited interconnection capacity. The approach is to divide nodes by transformer zone, let each node run independently, and have the station-level EMS handle surplus power exchange. A common practice in parks is to split rooftop PV, storage and charging piles into three to five nodes rather than routing everything into one equipment room. Rooftop PV plus storage for commercial and industrial users The rooftop PV output curve and the load curve do not match in time; output peaks at noon while some daytime periods also have high consumption. Adding storage shifts the midday surplus to the evening peak. The node is usually located below the roof, with capacity configured according to the number of inverters, and communication via RS485 to the park aggregation point. Charging stations coordinated with PV and storage Charging loads are concentrated in specific periods, and connecting them directly tends to raise the transformer peak. Connecting the charging piles behind the PV-storage node lets the station-level EMS allocate PV and battery output according to charging demand, prioritizing charging during valley hours to reduce demand charges while preventing charging surges from affecting other loads. Plant microgrid with multiple complementary energy sources PV, storage, diesel generators and adjustable loads (such as refrigeration, air compression and hydrogen production pre-treatment) coexist. The key in such scenarios is not stacking equipment but determining who supplies power under what conditions. The diesel generator starts only when battery SOC falls below a threshold or the load exceeds the PCS capability, and stays on standby the rest of the time. Data center backup power For scenarios sensitive to transfer time, the node must have genuine off-grid output capability, not a combination of a grid-tied unit plus an STS. Design should size the battery according to the actual IT load in use rather than installed capacity, and confirm the scope of supply to be maintained during upstream grid maintenance. Rural distribution area PV-storage pilot During the day, PV export raises the voltage at the end of the feeder; in the evening, load drops and PV output drops in step, making voltage limit violations likely. Such pilots typically use small-capacity wall-mounted models distributed downstream of the distribution transformer, relying on node-level voltage control to limit export rather than on large equipment in an equipment room. Overall zero-carbon park solution When a park applies for zero-carbon or green power certification, the metering basis must match the certification rules. The difficulty in such projects is usually not the equipment but the data: the self-consumption ratio in green power trading, the ownership of surplus power fed to the grid, and green certificate coverage must be determined at the node division stage, otherwise they cannot be traced later. Distributed expansion of existing equipment rooms An existing equipment room and interconnection capacity are in place, and the goal is to add PV and storage without applying for new capacity. The approach is to distribute the new equipment to locations near load centers, using the existing interconnection capacity as a unified constraint. This requires the existing equipment's EMS to support receiving external power commands; otherwise the new nodes can only operate independently. Design and Implementation Points ① Divide nodes first, then select equipment Node division is based on transformer zones, ownership boundaries and interconnection point locations, not equipment models. First settle "who is where, connected to what, and whose account it goes on," and only then does equipment selection have constraints. Doing it the other way around often results in buying the right equipment but being unable to connect it to the grid. ② Calculate each node's capacity independently Sufficient total station capacity does not mean every node has enough. A node's capacity depends on the PV output, load curve and available interconnection capacity within that node, and the three must match. A common mistake is sizing the battery to the whole site's peak load, leaving batteries at remote nodes idle for long periods. ③ Define the off-grid supply scope clearly You must list item by item the equipment that must remain powered during an outage and confirm each item's starting current. The storage must handle the starting surges of these loads on its own; total rated power cannot be used as a substitute. VGRID POWER models generally support 1.1× continuous / 1.25× short-time overload (SP60HCG2 up to 150%), but high-power motors still need separate calculation. ④ Set protection settings node by node Fault current levels differ across nodes in a multi-node system, so applying one set of settings site-wide will inevitably cause problems. Overcurrent, instantaneous and ground protection settings and time delays must be calculated separately according to each node's equivalent impedance and coordinated with upstream and downstream grading. Grid-tied and off-grid protection criteria differ and must be set separately. ⑤ Keep only one reference source when paralleling multiple units When multiple grid-forming units are paralleled, one must be designated as the master to establish the voltage and frequency reference, with the others following as slaves. Two units establishing a reference simultaneously will cause frequency fighting and circulating currents. VGRID POWER SP250HAG2T and SP375/500HAG2 both support paralleling of 3 units; configuration must specify master assignment and transfer logic. ⑥ Choose the right environmental and protection ratings Outdoor or semi-outdoor: wall-mounted models use IP65 (LEONA-H135K), all-in-one cabinets use IP54 (SP250HAG2T, SP375/500HAG2). In high-temperature areas, note derating—products operating above 45℃ derate output according to a curve, and high altitude (above 2000m) also requires derating. If these two are overlooked, problems are most likely to appear during summer peak demand. Project Photos PV-storage all-in-one units installed in a plant Distributed nodes and pad-mounted transformer Rooftop PV array Storage cabinets and fire protection facilities Station-level monitoring room Interconnection point switchgear and protection Park charging facilities Multi-node communication cabling Frequently Asked Questions How do I choose between a distributed microgrid and a single-point microgrid? Look at two conditions: **whether the nodes are dispersed and under different ownership**, and **whether the interconnection capacity is tight**. If the resources are concentrated near one equipment room and ownership is single, a single-point solution is simpler and more economical; if the resources are dispersed across multiple locations with different owners, or the interconnection capacity is already near its limit, the case for a distributed solution emerges. There are also hybrid forms—a single main point with local nodes. How much PV and storage can one node carry? It depends on the combination of equipment within the node. VGRID POWER's product line covers 30kVA to 750kVA, from a single wall-mounted hybrid inverter with one battery bank up to a 375/500kVA all-in-one unit with multiple PV inputs. How much can actually be connected is mainly limited by three things: **the number of PV input channels and the power per channel are limited by the inverter**, **battery current is limited jointly by the PCS and the cable cross-section**, and **the interconnection capacity**. The first two depend on the model specifications; the third requires on-site measurement. What happens if communication between nodes is lost? Each node should be able to maintain operation independently; this is a basic requirement of a distributed solution. When communication is lost, the node continues operating according to the last power command received, with the local controller as a fallback, rather than tripping and shutting down. Note that **the consequences of losing communication in off-grid mode differ from grid-tied mode**: when grid-tied, a node can obtain a frequency reference from the grid, whereas off-grid it relies entirely on itself, so the local control logic of an off-grid system must be able to perform voltage and frequency regulation independently. Is a distributed solution a higher investment than a single-point one? Equipment costs are usually higher—more points and smaller capacities mean more units and more communication and protection configuration. But total cost of ownership may be lower: distributed local supply reduces cable length and line losses, a smaller fault impact area means less loss from outages, and expansion proceeds on demand rather than all at once. Whether it is economical depends on the site's expansion frequency and the magnitude of outage losses; it is advisable to compare total cost of ownership over a 10-year period rather than looking only at the initial quote. Can a single-point system be converted to a distributed one later? Yes, but the cost is usually higher than designing for distributed operation from the start. Conversion means adding interconnection points and protection configuration, redoing communication and metering, and possibly replacing existing EMS equipment that lacks distributed interfaces. The real problem is this: if node-level metering and communication were not implemented initially, the historical data for each node cannot be reconstructed during a later retrofit, making multi-owner settlement difficult. So the key is not whether it can be converted, but whether interfaces and metering points were reserved at the outset. How long does a project take from contract signing to commissioning? The main time is not in equipment supply but in design and approvals. A typical schedule: site survey and data collection 2 to 3 weeks, solution design and selection confirmation 2 to 3 weeks, equipment delivery 4 to 8 weeks (all-in-one units and wall-mounted units differ considerably), installation and commissioning 1 to 3 weeks, grid connection acceptance and filing 2 to 6 weeks, depending on the local power supply department's procedures. If storage grid connection testing or fire safety review is involved, additional time is required. Is your park suitable for a distributed microgrid? Provide the interconnection point locations, a list of connected distributed resources and load curves, and VGRID POWER can complete node division and preliminary capacity calculations, and offer a comparison of distributed and single-point options. [Get a Distributed Microgrid Solution](/zh/contact) # Grid-Connected / Off-Grid & Weak-Grid Microgrid On/Off-Grid · Weak Grid · Grid-Forming On/Off-Grid and Weak-Grid Microgrids: Stable Power Where the Grid Is Unreliable **An on/off-grid microgrid operates in both grid-connected and off-grid modes, while a weak-grid microgrid is designed specifically for end-of-line supply scenarios with low short-circuit capacity and large voltage fluctuations.** The technical core of such systems comes down to one term: **grid-forming**. Grid-following equipment acts like a "follower" and must rely on an external voltage and frequency reference to operate; a weak grid is precisely where that reference is missing. On such lines, ordinary grid-following PCS units experience voltage sags, frequency deviation, or even fail to connect to the grid. VGRID POWER's solution uses grid-forming PCS to actively establish a voltage and frequency reference, combined with seamless on/off-grid switching, to achieve "grid power when available, stored energy when not." **0ms**Active on/off-grid switching of the all-in-one unit **<20ms**Passive switching / STS module switching time **125%**Grid-connected unbalance tolerance **-20%~+15%**Grid voltage adaptation range Grid-Following vs. Grid-Forming: The Essential Difference This is the first dividing line in equipment selection for weak-grid scenarios, and the root cause of many cases where "equipment is installed but cannot drive the load." Grid-Following Principle: measures the voltage and frequency phase of the external grid and outputs current synchronized to it. Equivalent to a "current source." Precondition: **a sufficiently strong external grid must exist as a reference.** When short-circuit capacity is insufficient or a remote fault causes voltage collapse, grid-following equipment loses its synchronization reference. Typical behavior: when end-of-line voltage sags, current commands cannot be executed, grid-connection faults are reported, frequency deviates, and the unit may repeatedly disconnect from the grid. Grid-Forming / VSG Principle: actively establishes a voltage amplitude and frequency reference and outputs voltage and phase. Equivalent to a "voltage source" and the true main power source in the system. Key capability: operates independently without an external reference; the voltage waveform is generated by its own algorithm, giving it strong disturbance rejection. Engineering value: enables PV, diesel generators, and other grid-following equipment to "attach" and run stably, and can also form an island on its own. One-line test **If the end-of-line voltage still sags at noon on a clear day with PV at full output, grid-forming is mandatory.** The criterion is simple: measure the short-circuit capacity at the point of common coupling and the end-of-line voltage on site. If either falls below nominal capacity or the voltage deviation exceeds limits, the line falls into the weak-grid category. Engineering Implementation of On/Off-Grid Switching There are two switching paths: integrated inside the equipment, or deployed as a standalone module. The two differ noticeably in retrofit cost and switching time. 01 Path One: PCS-Integrated Switching (All-in-One Solution) The [SP250HAG2T PV-storage on/off-grid all-in-one unit](/en/product/sp250hag2t) integrates a PCM on/off-grid transfer switch, with 0ms active switching time and <10ms passive switching time. On site, only the grid and load circuits need to be connected; the system automatically performs detection and switching without a separate transfer device. This is the least troublesome approach for new projects. 02 Path Two: Standalone STS Module (Retrofit Solution) When adding on/off-grid capability to an existing system, a [STS200/400/600 static transfer module](/zh/product/sts200-400-600) is typically installed on the AC bus: rated 200/400/600kW, maximum AC current 330/660/1000A, switching time <20ms, with integrated bidirectional detection on the grid side and load side, LocalEMS, and RS485/CAN/4G communication. The drawback is an additional energy conversion loss and equipment cost. What switching time means The engineering meaning of switching time depends on the nature of the load. Lighting, IT, and control circuits can tolerate interruptions in the hundreds of milliseconds; precision machining, medical equipment, and semiconductor production lines may directly produce scrap or shut down on a transient interruption. Selection should be based on **the most sensitive load category**, not on average demand. VGRID POWER On/Off-Grid / Weak-Grid Product Portfolio The mainstay is grid-forming all-in-one units, supplemented by wall-mounted models and standalone transfer modules, covering 30kVA to 500kVA. [SP250HAG2T PV-Storage On/Off-Grid All-in-One Unit (Grid-Forming) Rated power (grid-connected) 250kVA Max output (off-grid) 275kVA Active switching time 0ms Passive switching time Technical Challenges in Weak-Grid Scenarios Four typical symptoms of a weak grid, interrelated but each requiring separate treatment. Challenge One Low Short-Circuit Capacity, Voltage Prone to Fluctuation Short-circuit capacity determines how "stiff" the grid is. The smaller the capacity, the greater the voltage deviation caused by an equivalent power disturbance. After high-power PV or storage is connected to an end-of-line circuit, the voltage may fall outside the ±7% range permitted by GB/T 12325; once the voltage at the point of common coupling collapses, an ordinary grid-following PCS will directly report a grid-connection fault. Challenge Two Voltage Unbalance and Harmonics On rural grids and end-of-line circuits with a high proportion of single-phase loads, voltage unbalance may far exceed standards. VGRID POWER models tolerate 125% unbalance when grid-connected and 100% on the off-grid side, with output voltage harmonics below 2% under resistive loads—this determines whether the equipment can avoid nuisance tripping on overcurrent protection under unbalanced loads. Challenge Three Frequency Fluctuation and Insufficient Inertia With large numbers of synchronous generators retired, system equivalent inertia drops and frequency becomes more sensitive to power imbalance. Grid-forming PCS actively responds to frequency changes through its own control loop, equivalent to supplying virtual inertia to the system—this is why it keeps voltage and frequency more stable in a weak grid. Challenge Four End-of-Line Voltage Sag The farther from the point of common coupling, the more line voltage drop accumulates. A typical field method: measure the voltage difference between the point of common coupling and the end of the line during full-load periods. If the deviation exceeds 7%, the line should be designed as a weak grid, and PCS selection should shift from grid-following to grid-forming. All all-in-one units have built-in grid-forming operation and an on/off-grid transfer switch; the SP250HAG2T additionally has a built-in isolation transformer, suitable for projects requiring electrical isolation. Typical Application Scenarios VSG Grid-Forming PV-Storage In areas where high PV output raises end-of-line voltage, grid-forming PCS absorbs power in reverse, stabilizing voltage while achieving PV consumption. Distribution Transformer Area Storage Voltage management for rural low-voltage distribution areas. Wall-mounted models deploy quickly and occupy little space, suitable for distributed placement. PV-Storage-Diesel AC/DC Coupled Microgrid PV, batteries, and PCS share a DC bus; DC-coupled charging efficiency exceeds 99.3%, eliminating one energy conversion stage. Factories in Weak-Grid Areas Voltage sags cause frequent equipment restarts or power quality non-compliance; supply quality must be solved before energy savings are considered. Islands and Remote Areas End-of-grid or intermittent supply scenarios requiring grid-connected operation when utility power is available and automatic takeover of critical loads during outages. Critical Load Backup For production lines and medical facilities sensitive to switching time, select the switching time specification based on the most sensitive load. Emergency Power and Diesel-Storage During grid outages, storage takes over while the diesel generator starts in sync as long-duration backup; the two split duties based on SOC. PV Arbitrage with Storage For renewable projects with voltage limit constraints at the point of common coupling, configuring grid-forming storage can satisfy both grid-code compliance and consumption requirements. Design and Implementation Points ① Clarify the Locations of the Point of Common Coupling and the Transfer Point Their locations directly determine the transient during switching. If the transfer point is far from the critical load, the voltage dip at the moment of switching will reach the load first. In engineering practice, the transfer point should be as close to the load side as possible, or a transition capacitor should be added ahead of the critical load. ② Determine the SOC Operating Window The SOC window of an on/off-grid system is much narrower than that of a pure grid-connected system: it must reserve a dispatchable range for peak shaving and valley filling while retaining energy for backup during outages. In practice, the discharge lower limit is usually set at 30%–40%, depending on the trade-off between backup duration requirements and battery cycle life. ③ Verify Load Starting Inrush At the moment of switching to off-grid, the battery must bear the starting inrush of the entire load alone. VGRID POWER models generally support **1.1× continuous / 1.25× short-time** overload (SP60HCG2 up to 150%), but the starting current of the largest single motor—6 to 7 times rated—must still be calculated separately; total rated power cannot be substituted for this. ④ Protection and Anti-Islanding The protection logic of an on/off-grid system is more complex than pure grid-connected: it requires anti-islanding protection (to prevent unintentional islands) while also ensuring that intentional islands (after switching) can be properly established. The two require different criteria and time delays and must be configured separately in design; a single set of settings cannot be shared. ⑤ Communication and Coordination for Multi-Unit Parallel Operation When multiple grid-forming PCS units operate in parallel, the master frequency source must be unique. In practice, one unit is designated as the master to establish the voltage and frequency reference, with the others following as slaves; if two units establish references simultaneously, frequency contention and circulating currents will occur. The SP250HAG2T and SP375/500HAG2 both support 3-unit parallel operation. ⑥ Environment and Protection Rating Weak-grid projects are mostly outdoors or semi-outdoors: wall-mounted models use IP65 (LEONA-H135K), and all-in-one cabinets use IP54 (SP250HAG2T, SP375/500HAG2). In high-temperature areas, note derating above 45℃; at high altitudes above 2000m, derating is also required. Project Gallery Integrated PV-storage-diesel microgrid Containerized energy storage cabin PCS cabinets in parallel arrangement On/off-grid transfer cabinet Battery cabin and fire protection configuration PV array and storage array Mine site microgrid Grid-connection switching and protection AC distribution and protection Frequently Asked Questions Will on/off-grid switching cause equipment shutdown? No. Grid-forming PCS keeps running throughout the switching process—this is the fundamental difference from "stop first, restart later" solutions. VGRID POWER all-in-one units have 0ms active switching time and <10ms passive switching time, with uninterrupted load during switching. What actually shuts down is pure grid-following equipment, because it cannot maintain output after losing the grid reference. Why must grid-forming equipment be used in weak-grid areas? Because a weak grid precisely lacks what grid-following equipment depends on to operate—an external voltage and frequency reference. On lines with low short-circuit capacity, the voltage at the point of common coupling may drop to the point where grid-following equipment loses lock. The only thing that can actively establish voltage in this case is grid-forming PCS. This also explains why some projects "connect to the grid fine but cannot drive the load": it is not that the equipment power is insufficient, but that it cannot operate under a weak reference. If ordinary grid-connected storage is already installed, can it be upgraded to on/off-grid? It depends on whether the existing equipment supports off-grid operation. Most ordinary grid-connected PCS units do not have off-grid output capability and cannot gain this function through a software upgrade; the equipment must be replaced. A feasible compromise is to install a standalone STS module on the AC bus and connect storage capable of off-grid operation, but this usually still requires adding a storage system. Therefore, clarifying whether on/off-grid capability is needed at the start of a project is far more economical than retrofitting later. Does grid-forming equipment incur additional losses in grid-connected mode? Grid-forming and grid-following designs have similar power conversion stages and comparable efficiency levels. The real loss difference comes from topology rather than control method: all-in-one units integrate MPPT and distribution inside the cabinet, reducing additional AC buswork; AC-coupled solutions add an extra conversion stage. Whether it is worthwhile should be judged by switching capability requirements rather than loss differences. How is switching time verified? Field measurement: install a power recorder (or use an oscilloscope) on the critical load, manually disconnect the point of common coupling, and record the duration of load voltage interruption. VGRID POWER products have factory specifications of 0ms active and <10ms passive; actual values are affected by switch mechanical action and detection logic. Acceptance should be based on measured values and recorded in the acceptance report. How is diesel hybrid operation implemented? In essence, it keeps the diesel generator operating only in its high-efficiency range. When battery SOC falls below a threshold, or the load exceeds PCS output capability, the diesel generator starts and supplies power in parallel with the PCS; when SOC is sufficient and the load is small, the diesel generator shuts down and the battery carries everything. The EMS decides in real time who supplies power based on SOC and load. VGRID POWER all-in-one units have built-in diesel-electric hybrid strategies and support automatic diesel generator start/stop. Is your line a weak grid? Provide the location of the point of common coupling, line length, and measured voltage data, and VGRID POWER can complete a weak-grid assessment and provide selection recommendations and transfer solutions for grid-following versus grid-forming. [Get a Weak-Grid Assessment and Selection](/zh/contact) # About Us [Company Profile](#s-profile)[Milestones](#s-history)[Manufacturing & Quality](#s-quality)[Global Markets & Customization](#s-global)[Business Information](#s-business)[News](#s-news)[Contact Us](#s-contact) Company Profile VGRID POWER is a manufacturer of core microgrid equipment, founded in Shenzhen in 2019. We focus on power conversion and on-grid/off-grid transfer in PV-storage-diesel microgrids, providing system integrators and project owners with complete solutions from core equipment to full-cabinet systems, and supporting OEM/ODM export partnerships. Our core team comes from the power electronics and PV energy storage industries. We invest continuously in R&D across three key areas — conversion, transfer and DC transformation — with products covering typical scenarios such as commercial and industrial energy storage, data center backup power, integrated PV-storage-diesel power stations and overseas grid-connection retrofits. SP series energy storage converters — covering the 30–135 kVA power range, with integrated on-grid/off-grid transfer and DC-coupled solutions. What We Do Our product lines are built around the three core elements of a microgrid — conversion, transfer and DC transformation: Energy storage conversion system PCS 30–135 kVA on-grid/off-grid transfer Energy management EMS Multi-unit paralleling and power dispatch Microgrid AC cabinet MPS 250–750 kVA full-cabinet solution **Energy storage conversion system (PCS / hybrid inverter)**: the power conversion core of commercial and industrial energy storage and microgrids, covering 30–135 kVA, with support for on-grid/off-grid transfer and DC-coupled solutions. **Transfer switch STS / PCM**: millisecond-level transfer between two power sources (transfer time <20 ms), ensuring continuous power supply for critical loads such as data centers and production lines. **Microgrid AC cabinet MPS / PV-storage on-grid/off-grid all-in-one unit**: a full-cabinet solution integrating PCS, MPPT, EMS and an isolation transformer, covering the 250–750 kVA power range. **DC converter DCDC / MPPT**: maximum power point tracking on the PV side and step-up/step-down of the DC bus, with support for multiple MPPT channels and wide voltage input. Milestones The following are key milestones in R&D, manufacturing and globalization since VGRID POWER was founded in 2019: 2019VGRID POWER was founded in Shenzhen, focusing on core equipment for power conversion and on-grid/off-grid transfer in PV-storage-diesel microgrids. ISO · CECertified to ISO 9001, ISO 14001 and ISO 52001 management systems; products hold CE certification, have passed TÜV Rheinland testing, and comply with standards including IEC 62109 and EN 50549-1. Global reachEquipment serves markets including China, Europe, Australia, Southeast Asia, Africa and South America, with support for OEM/ODM export partnerships and full-cabinet customization. Equipment serves markets including China, Europe, Australia, Southeast Asia, Africa and South America — with support for OEM/ODM export partnerships and full-cabinet customization. Manufacturing & Quality Multi-unit paralleling and on-load testing — on-grid/off-grid transfer and protection verification are completed unit by unit before shipment. The company headquarters and manufacturing base are located in Guangming District, Shenzhen, with approximately 2,800 m² of production and office space and a current team of 59 people. Product design follows power electronics and grid-connection standards: the company is certified to ISO 9001, ISO 14001 and ISO 52001 management systems, products hold CE certification, have passed TÜV Rheinland testing, and meet the requirements of standards including IEC 62109 and EN 50549-1. **2,800 m²**Production and office space **59 people**R&D and manufacturing team **2019**Founded in Shenzhen **<20 ms**On-grid/off-grid transfer time Global Markets & Customization Services VGRID POWER equipment already serves markets including China, Europe, Australia, Southeast Asia, Africa and South America. In addition to standard products, we support OEM/ODM partnerships and full-cabinet customization, providing end-to-end support from model selection and configuration through system design to volume delivery. **OEM / ODM**: customized development and contract manufacturing to customer brand and specification requirements. **Full-cabinet customization**: PV-storage on-grid/off-grid all-in-one units can be configured for power, interfaces and protection rating according to project requirements. **Technical support**: model selection advice and solution responses within 48 hours (business days 09:00–18:00, GMT+8). Overseas integrated PV-storage-diesel projects — end-to-end support from model selection and configuration to volume delivery. Business Information The following notes and policies help you quickly understand matters related to cooperation, ordering and after-sales service. Click through to the corresponding pages for full details. [FAQ Answers to common questions on ordering, delivery, warranty and more →](/zh/page/faq)[Shipping & Payment Logistics methods, lead times and payment terms →](/zh/page/shipping-payment)[Privacy Policy How personal information is collected and used →](/zh/page/privacy-policy) News Keep up with the latest developments, product progress and industry insights from VGRID POWER. [All News A roundup of company news and industry observations →](/zh/category/news)[Company News Product, project and team updates →](/zh/category/company-news)[Industry Insight Analysis of microgrid and energy storage trends →](/zh/category/industry-insight) Contact Us Shenzhen VGRID POWER Technology Co., Ltd. 10th Floor, East Gate, Building 3, Huidongsheng Industrial Park, Yutang Street, Guangming District, Shenzhen For product selection, solution evaluation or partnership discussions, please [contact us](/zh/contact). The Shenzhen VGRID POWER Technology Co., Ltd. team — you are welcome to visit and talk with us. [Contact Us Address, phone and email →](/zh/contact)[Careers View open positions and how to apply →](/zh/category/careers) --- # How to Scale a Microgrid to 1 MW, 1.5 MW or 2 MW with Parallel PCS Cabinets A practical guide to MW-scale PCS expansion: system blocks, parallel limits and the project data needed before cabinet count can be confirmed. A 1 MW, 1.5 MW or 2 MW target describes the required system output; it does not by itself determine the number of cabinets. A defensible design starts with the load profile, the selected cabinet’s continuous active-power rating, power factor, operating mode and required redundancy. Build the system around AC and DC buses A typical storage path is **battery DC bus ↔ bidirectional PCS cabinets ↔ AC bus → loads**. The utility grid and diesel generator connect to the AC system through project-rated switchgear and protection. PV may connect through a hybrid cabinet’s integrated MPPT, a separate PV inverter, or a separately engineered DC/DC stage. These alternatives are not interchangeable; the single-line diagram must show the selected path. VGRID’s LEONA-B750K is a split-type, grid-forming hybrid inverter and energy-storage conversion system in the 750 kW class. It integrates PCS, EMS, an isolation transformer and automatic grid/off-grid switching; PV MPPT controllers are selected separately. The brochure lists 750 kVA rated off-grid apparent output and 825 kVA maximum output. It illustrates three cabinets in a 2.25 MW parallel design, but final cabinet count, active output and protection must be confirmed for the project. SP250HAG2T is a 250 kW class hybrid cabinet with integrated PV MPPT and a specified maximum of three parallel units. For SP375HAG2 and SP500HAG2, confirm active and apparent ratings in the configuration-specific datasheet. What determines the cabinet count? Use the continuous active-power rating available at the required power factor and site conditions, then account for peak demand, motor starts, ambient-temperature derating, battery current, maintenance strategy and any N+1 requirement. Apparent-power and current limits can bind before the headline kW figure. The final design must also verify that firmware, parallel controller, communications, transformer impedance and protection settings are compatible across cabinets. Example capacity targets For a 1 MW target, assess whether the selected cabinet combination can continuously deliver at least 1 MW at the project power factor, including derating and reserve. Repeat the same check for 1.5 MW and 2 MW; do not assume that a simple arithmetic sum is the usable site output. If a 750 kW cabinet is selected, two cabinets have a nominal arithmetic sum of 1.5 MW active power, but the approved system output still depends on parallel limits, load profile, protection, battery capability and project confirmation. Design information to provide before quotation Hourly and peak load profile, largest motor, starting method and critical-load list. Required continuous active power, power factor, overload duration and redundancy. Battery chemistry, usable energy, DC voltage range, charge/discharge current and autonomy. PV capacity, string voltage/current and whether AC or DC coupling is preferred. Grid voltage, fault level, import/export rules and islanding requirements. Generator rating, voltage, frequency, minimum loading and synchronization requirements. Transformer, grounding, short-circuit, protection, transfer-time and local-code requirements. Ambient temperature, altitude, enclosure and service-access conditions. When to choose a hybrid cabinet or a PCS cabinet Choose an integrated hybrid cabinet when its built-in PV conversion, transfer equipment and controls match the project. Choose a PCS-centred architecture when PV conversion is external or the project needs a larger, separately engineered AC system. Request the model-specific datasheet, interface drawing, parallel-control statement and certificates available for the offered configuration. Compare [SP250HAG2T](/en/product/sp250hag2t), [SP375/500HAG2](/en/product/sp375-500hag2) and [LEONA-B750K](/en/product/sp750h54pstd-2). ### FAQ **Q: How many PCS cabinets are needed for a 1 MW, 1.5 MW or 2 MW system?** The count depends on the verified continuous active-power rating of the selected cabinet, power factor, redundancy target and control compatibility. Do not calculate cabinet count from a model name alone; use the final datasheet and single-line design. **Q: Can LEONA-B750K cabinets be paralleled?** Multi-cabinet parallel operation is supported. The maximum count and total system rating must be confirmed for the selected controller, protection scheme and project. **Q: Can PV, batteries, grid and diesel generators share one microgrid?** They can be coordinated in an engineered system. PV conversion, battery DC voltage, generator interface, transfer equipment, protection and EMS dispatch logic must be specified together. # Cambodia 1.5 MW Industrial Park Solar-Storage Microgrid Twelve 125 kW PCS units in parallel, plus MPPT and 600 kW grid-forming switches, deliver uninterrupted power for injection molding loads in Cambodia. Located in Cambodia, this project serves an industrial park with injection molding lines. A wall-mounted DC-coupled grid-tied/off-grid system uses 12×125 kW PCS units to output 1.5 MW AC, together with 6×120 kW MPPT units and 3×600 kW grid-forming switches, enabling seamless energy dispatch among PV, battery, grid and diesel generator. Project Background The local grid in Cambodia is unstable, and injection molding machines are highly sensitive to power interruptions. Outages cause line stoppages, mold damage and product scrap. The customer needed a PV+storage+backup microgrid that operates grid-tied under normal conditions and switches to off-grid mode in milliseconds when the grid fails. System Configuration 12 × 125 kW PCS units (1.5 MW AC parallel output) 6 × 120 kW MPPT units (PV connected close to the DC bus) 3 × 600 kW grid-forming/off-grid transfer switches One cluster one management DC-coupled architecture Project Solution System topology: PV connects to the DC bus through MPPT; battery is directly linked to the DC bus; PCS inverts power for the load. Grid and diesel generator connect via transfer switches. 整套系统采用中腾数能构网型 PCS 与 MPPT 直流耦合技术，具备毫秒级并离网切换、一簇一管理、SOC 主动均衡与高防护等级等能力，可根据现场条件灵活扩展功率与容量。 Site Photos On-site photo: equipment room in the Cambodian industrial park, with PCS, switchgear and battery clusters installed compactly. Operation Results Automatic off-grid switchover in Twelve PCS units output 1.5 MW with current harmonics Direct PV connection eliminates one combiner stage, raising overall efficiency by ~2% One-cluster-one-management plus active SOC balancing keeps multiple battery racks balanced Get a similar solution If you have a similar microgrid or energy storage project, contact VGRID for a tailored solution and quote. [More cases](/en/cases) # Zambia 200 kW / 430 kWh Mining Camp Solar-Diesel-BESS Microgrid Two standard solar-diesel-BESS all-in-one units in parallel integrate PCS, MPPT and transfer switches to power a Zambian mining camp with significantly lower diesel use. Located at a Zambian mining camp, this project deploys two standard solar-diesel-BESS all-in-one units in parallel. Each unit integrates one PCS, one MPPT and one PCM grid-tied/off-grid transfer switch, jointly powering the camp and realizing PV-storage-diesel complementary operation. Project Background The camp is far from the main grid and previously relied on diesel generators, with high fuel logistics costs, noise and emissions. The customer wanted PV and storage to cut diesel consumption while maintaining power during outages. The site also has a large share of single-phase loads, challenging the PCS loading capability. System Configuration 2 × 125 kW PCS units 2 × 120 kW MPPT units 2 × 170 kW grid-tied/off-grid transfer switches Two solar-diesel-BESS all-in-one units in parallel Project Solution System topology: two all-in-one units run in parallel. PV charges or directly supplies via MPPT; battery inverts through PCS; diesel generator serves as backup AC source. 整套系统采用中腾数能构网型 PCS 与 MPPT 直流耦合技术，具备毫秒级并离网切换、一簇一管理、SOC 主动均衡与高防护等级等能力，可根据现场条件灵活扩展功率与容量。 Site Photos Site photos: Zambian mining camp with outdoor installation of the solar-diesel-BESS units and switchgear. Operation Results Fast off-grid switchover during grid outages keeps the camp powered Diesel generator auto-starts when SOC falls below setpoint to supply loads and recharge battery Built-in active SOC balancing equalizes two battery paths Optimized control algorithms improve single-phase load capacity and site stability Get a similar solution If you have a similar microgrid or energy storage project, contact VGRID for a tailored solution and quote. [More cases](/en/cases) # 2.5 MW Off-Grid Solar-Storage Microgrid for Overseas Mine Twenty 125 kW PCS units in parallel deliver 2.5 MW for a large overseas mine, coordinated by a PCC controller with diesel backup for high-reliability off-grid power. Serving a large overseas mine, this project uses twenty 125 kW PCS units in parallel to build a 2.5 MW microgrid. A single PCC controller coordinates the system, driving contactors to switch between grid-tied and off-grid modes while integrating diesel generators as backup power to keep critical mine loads running. Project Background Large mines are often far from the grid and need stable megawatt-level power for crushers, mills and dewatering pumps. Traditional diesel-only solutions have huge fuel consumption, while PV-only solutions cannot guarantee night-time or cloudy-day supply. The customer wanted a PV+storage+diesel grid-forming microgrid to replace the traditional approach with clean, stable and scalable off-grid power. System Configuration 20 × 125 kW PCS units (2.5 MW parallel output) 1 × PCC power coordination controller Diesel generators as backup AC source Contactors + grid-tied/off-grid transfer switches Project Solution System topology: 20 PCS units form the grid in parallel. The PCC controller dispatches PCS between grid-tied and off-grid modes based on grid/diesel availability; PCS runs grid-tied when diesel is online and forms the off-grid grid when diesel is offline. 整套系统采用中腾数能构网型 PCS 与 MPPT 直流耦合技术，具备毫秒级并离网切换、一簇一管理、SOC 主动均衡与高防护等级等能力，可根据现场条件灵活扩展功率与容量。 Site Photos Site photos: mine electrical building and outdoor containerized storage/PCS installation. Operation Results Twenty PCS units output 2.5 MW to meet high-power mine loads PCS runs grid-tied when diesel is online and auto-switches to grid-forming off-grid when diesel stops PCC unifies switchover and power sharing with <20 ms transfer Any single device failure or withdrawal does not affect overall system operation Get a similar solution If you have a similar microgrid or energy storage project, contact VGRID for a tailored solution and quote. [More cases](/en/cases) # Maldives Island 6.3 MW Grid-Forming Microgrid Eighteen 350 kW grid-forming PCS units are paralleled without inter-unit communication to create six 1.05 MW units, powering a Maldivian island resort with high reliability. Located at a Maldivian island resort, this project uses eighteen 350 kW grid-forming PCS units to build a 6.3 MW island microgrid. Three PCS units form one 1.05 MW unit, and six such units connect their AC outputs in parallel to form the grid without inter-unit communication. Diesel generators connect directly and can start/stop at any time while the PCS maintains voltage and frequency support. Project Background Island resorts are far from mainland grids and traditionally rely on diesel generators with high fuel logistics costs and environmental impact. The customer wanted a PV+storage grid-forming microgrid to drastically cut diesel consumption while guaranteeing that any single device failure would not affect overall power supply, meeting the strict quality and reliability demands of a luxury resort. System Configuration 18 × 350 kW grid-forming PCS units 3 PCS units per 1.05 MW unit, 6 units total Six units paralleled at the AC output without communication Diesel generator directly connected, start/stop on demand 6 × 50 kW PV inverters on the AC bus Project Solution System topology: 18 PCS units form six grid-forming groups paralleled on the AC bus. PV inverters and diesel generators connect to the AC bus; PCS units autonomously maintain voltage and frequency, so any unit can drop without affecting the system. 整套系统采用中腾数能构网型 PCS 与 MPPT 直流耦合技术，具备毫秒级并离网切换、一簇一管理、SOC 主动均衡与高防护等级等能力，可根据现场条件灵活扩展功率与容量。 Site Photos Site photos: Maldivian island resort with the storage/PCS building and rooftop PV arrays. Operation Results Eighteen grid-forming PCS units output 6.3 MW for the whole island Stable parallel operation without inter-unit communication simplifies deployment and maintenance Diesel generator can start or stop at any time; PCS maintains system operation without mode switching Any single device failure or withdrawal does not affect normal system operation Get a similar solution If you have a similar microgrid or energy storage project, contact VGRID for a tailored solution and quote. [More cases](/en/cases) # Power Electronics R&D Engineer (PCS) Responsible for the power stage and topology design of the power conversion system (PCS), participating in the full process from prototype to mass production. Responsible for the power stage and topology design of the power conversion system (PCS), participating in the full process from prototype to mass production. # European-standard PCS to US-standard voltage: N conductor return path design pitfalls under single-phase loads Drawing on a Mexican solar-plus-storage project case, this analyzes the missing N conductor return path caused by single-phase loads when a European-standard 400 V PCS is stepped to US-standard voltage via a transformer, along with corrective approaches. Introduction: A Misread Technical Issue A solar-plus-storage project in Mexico offers a case worth reviewing: a system using a European-standard 400 V PCS (Power Conversion System) stepped through a transformer to a US-standard voltage regime showed abnormal phase voltage sampling on the PCS side during operation, and was at one point misdiagnosed as a "product quality problem." Investigation showed the root cause was not the PCS itself, but that the system design stage had not adequately accounted for the dependence of single-phase loads on the N conductor (neutral) return path. This article works from electrical principles to lay out the cause, symptoms and corrective path for reference by system integrators. Background: Voltage Regime Differences in Mexico Mexico belongs to the North American market system, where common voltage regimes are 120/240 V single-phase and 480 V three-phase; many imported PCS units, however, are designed to the European 230/400 V three-phase four-wire system. Integrators typically add a transformer at the PCS output to perform the voltage conversion, but easily overlook one key point: the continuity of the N conductor return path directly determines whether single-phase loads can operate normally and whether the PCS can obtain an accurate voltage reference. In-Depth Analysis of the Problem 1. Root Cause In this case, single-phase equipment such as meters and air conditioners was installed in the system cabinet, and these devices draw phase voltage between the phase conductor and the N conductor. The design flaw was that the N conductor on the PCS side did not form a complete return path, so when single-phase loads were energized, the PCS could not detect complete phase voltage sampling. 2. Specific Symptoms PCS phase voltage sampling values were unstable, with severe imbalance between phase voltages; Some precision single-phase equipment reset frequently or operated abnormally; The system triggered overvoltage/undervoltage protection and disconnected from the grid frequently. 3. Technical Principle In a three-phase four-wire system, the N conductor carries the return current of single-phase loads. The current path of a single-phase load is: phase conductor → load → N conductor. If the N conductor return path on the PCS side is incomplete, this leads to: Interruption of the current path, so single-phase loads cannot operate normally; Loss of an accurate voltage reference point for the PCS sampling circuit; Drift of the system ground potential, affecting the overall voltage reference. From the standpoint of symmetrical components, a single-phase load introduces a zero-sequence component into the system, and the zero-sequence current requires a path through the N conductor. When the N conductor is missing or has high impedance, the zero-sequence current is forced to return through the PE conductor or the earth, the neutral point potential shifts accordingly, and phase voltage sampling is naturally distorted. This mechanism is consistent with the IEC 60364 requirement to separate the earthing and protective conductor functions in a TN system, and is also relevant to the EN 50549 requirements for voltage monitoring of grid-connected converters. Solutions and Preventive Measures 1. Correct System Design **Continuous N conductor throughout**: from the PCS output to the transformer and on to the load distribution panel, the N conductor should remain continuous, avoiding open circuits or high-impedance connections. **Transformer selection and wiring**: choose a dedicated transformer suited to European-to-US standard conversion, confirm the winding connection arrangement (such as Δ-Y) and provide a complete N conductor tap point. 2. On-Site Troubleshooting and Correction **Continuity testing**: check the continuity of the N conductor from the PCS to the transformer section, ensuring resistance is less than 0.5 Ω. **Earthing system check**: confirm that the correct TN-S earthing method is used, with the N conductor and PE conductor connected only once, at the transformer neutral point. **Voltage monitoring**: measure the PCS-end voltages of each phase (phase-to-phase and phase-to-N) under different load operating states and record the data to analyze abnormal patterns. 3. System Integration Recommendations **Design stage**: complete the single-line diagram design with the N conductor path clearly marked; calculate the N conductor current according to the maximum unbalanced load to ensure the conductor size is sufficient. **Installation stage**: use conductors of the same material for the N conductor as for the phase conductors, and never connect a switch or circuit breaker in series in the N conductor. **Commissioning stage**: perform voltage stability tests when simulating single-phase load switching, covering operating conditions such as seamless grid-connected/off-grid transfer. Summary and Takeaways The problem in this case was not a product quality issue, but a system integration design flaw. Through scientific analysis and technical correction, an abnormal N conductor return path can be fully resolved. In regions such as Mexico that require voltage regime conversion, integrators should pay attention to the completeness and standardization of system design, avoiding unnecessary after-sales costs and brand damage caused by design oversight. The prerequisite for stable operation of a European-standard 400 V PCS in US-standard voltage regions is the correct coordination of three things: the N conductor return path, the earthing method and the transformer wiring; specific parameters need to be verified against on-site conditions. ### FAQ **Q: When a European-standard 400 V PCS is connected through a transformer to convert to a US-standard voltage, why does abnormal phase voltage sampling occur?** Single-phase loads introduce a zero-sequence component into the system, and the zero-sequence current requires the N conductor to provide a return path. If the N conductor loop on the PCS side is incomplete, the zero-sequence current is forced to return through the PE conductor or earth, the neutral point potential shifts, and the PCS sampling circuit loses an accurate voltage reference, manifesting as unstable phase voltage and phase-to-phase imbalance. How can one determine whether an N conductor loop is missing in the system? The continuity of the N conductor from the PCS to the transformer section can be measured in sections to confirm that the resistance is less than 0.5 Ω; at the same time, record the phase-to-phase and phase-to-N voltages under different single-phase load conditions and observe whether there is a shift that varies with load. The grounding arrangement should be confirmed as TN-S, with the N conductor and PE conductor connected at a single point only at the transformer neutral. What effect does the transformer winding connection have on the N conductor loop? A Δ-Y transformer can provide a neutral point lead-out, making it easier to establish a complete N conductor loop; if a connection method without a neutral point lead-out is used, single-phase loads will be unable to obtain phase voltage. During selection, the winding connection group and neutral point lead-out conditions must be confirmed, and the specifics need to be verified in conjunction with the on-site load distribution. Can a switch or circuit breaker be installed in the N conductor? A switch or circuit breaker should not be connected in series in the N conductor. Once the N conductor is disconnected, the single-phase load circuit is interrupted, and the neutral point potential may also float, endangering equipment and personal safety. Relevant requirements can refer to IEC 60364 provisions on neutral conductor protection and isolation. After corrective work, how can one verify that the system has returned to normal? It is recommended to conduct simulated single-phase load switching tests covering seamless grid-connected and off-grid switching conditions, and to monitor the voltage of each phase and the neutral point potential shift at the PCS end; the test items and acceptance criteria should be verified in conjunction with the on-site short-circuit capacity, transformer capacity, and local grid-connection requirements. # Full Charge Departure · Riding the Waves in Qingyuan — VGRID POWER 2026 Annual Team Building Event Concludes Successfully To strengthen team cohesion and enrich employees' cultural life, from August 28 to 29, 2026, Shenzhen VGRID POWER Technology Co., Ltd. (VGRID Power) organized all employees on a two-day, one-night team building trip to Qingyuan, Guangdong, under the theme "Full Charge Departure · Riding the Waves in Qingyuan." Away from their busy posts, everyone stepped into the mountains and waters, releasing stress and deepening connections in nature, and returning with renewed energy To strengthen team cohesion and enrich employees' cultural life, from August 28 to 29, 2026, Shenzhen VGRID POWER Technology Co., Ltd. (VGRID Power) organized all employees on a two-day, one-night trip to Qingyuan, Guangdong, under the theme"Full Charge Departure · Riding the Waves in Qingyuan". Away from their busy posts, everyone stepped into the mountains and waters, releasing stress and deepening connections in nature, and returning with renewed energy to meet the challenges ahead. Challenging Ourselves, Energizing Our Youth On the first day, the team headed to Gulong Gorge Scenic Area, where employees could choose between two activities: rafting or the Yuntian Glass Bridge. The rafting group rode rubber boats through the 6.1 km gorge waterway, cutting through the waves and experiencing the thrills of a "water roller coaster" across a 378 m drop; the Yuntian Glass Bridge group stepped onto the suspended glass platform and glass bridge, looking down at the magnificent gorge scenery from a height of over a hundred meters, challenging themselves and pushing their limits. Each activity had its own appeal, and everyone released stress amid screams and laughter, fully enjoying the coolness and vitality of summer. [Photo: Group photo of all employees / Gulong Gorge Scenic Area] As night fell, the event moved into a warm and lively segment: a barbecue and bonfire party. Around the blazing bonfire, everyone sat together, with the aroma of grilled food in the air and songs drifting along, while interactive games pushed the atmosphere to a climax. Employees set aside the rigor and busyness of work, showing a relaxed and lively side, and the distance between them quietly narrowed amid laughter and conversation. Among Mountains and Waters, Building Strength The next day, the team headed to Bijia Mountain Ecological Tourism Area. Cascading waterfalls plunge down amid drifting mist, and plank paths wind through the forested hills. Everyone strolled along, taking in the fresh and magnificent scenery of nature, relaxing body and mind and exchanging thoughts among the mountains and waters. [Photo: Group photo at Bijia Mountain] The afternoon cruise on the Beijiang River was equally memorable. Sailing along the river, with green mountains on both banks like a painting and the river breeze on their faces, everyone felt refreshed and relaxed. Colleagues either leaned on the railings gazing into the distance or sat together chatting freely, deepening understanding and friendship in the leisurely hours. Uniting Strength, Moving Toward the Future Together The two-day, one-night team building trip concluded successfully amid laughter and joy. It was not only a journey to relax body and mind, but also a spiritual recharge that brought the team's strength together. This event fully demonstrated the positive, united and collaborative spirit of VGRID POWER employees, and also let everyone feel the company's care and warmth beyond work. In the future, the VGRID Power team will devote itself to work with greater enthusiasm and higher morale, uniting strength and moving forward hand in hand, jointly driving the company's continued innovation and development in the energy storage field and contributing to the global green energy cause. —————————————————————————————— About VGRID POWER Shenzhen VGRID POWER Technology Co., Ltd. (VGRID Power) is a high-tech enterprise focused on energy storage technology innovation and global energy digitalization solutions, dedicated to providing safe, efficient and intelligent full-scenario energy storage products and services for commercial and industrial as well as power plant-level customers. Website: www.vgridpower.com Keywords: VGRID POWER, VGRID Power, team building event, corporate culture, team building # Mobile Energy Storage Vehicle Solution An all-purpose mobile energy fortress that flexibly supports backup power, emergency response and temporary loads, plug and play. Solution Overview Vehicle-mounted integrated energy storage and power conversion equipment delivers rapidly deployable mobile power to support backup power, emergency response and temporary loads. Key Points An all-purpose mobile energy fortress, plug and play Vehicle-mounted PCS supports both grid-connected and off-grid operation No civil works required; multiple vehicles can be paralleled for capacity expansion Supports backup power, emergency response and temporary loads Application Scenarios and Challenges Large events, emergency repairs and disaster areas lack flexible power sources; fixed power stations are slow to build and difficult to relocate. VGRID System Composition **Power Conversion System (PCS)**: Vehicle-mounted bidirectional conversion, supporting both grid-connected and off-grid operation. **Static Transfer Switch (STS)**: Grid-connected/off-grid switching for rapid load connection. **Battery Energy Storage System (BESS)**: Automotive-grade batteries, highly safe and transportable. **Energy Management System (EMS)**: Vehicle-mounted monitoring and scheduling with remote visibility. **Microgrid AC Cabinet (MPS)**: Integrated into the vehicle-mounted all-in-one cabinet, plug and play. Core Value Rapid deployment, plug and play Multiple scenarios: backup power, emergency response and temporary use Replaces diesel emergency vehicles, cleaner Multiple vehicles can be paralleled for capacity expansion Typical Applications Suitable for backup power at major events, grid emergency repairs, power supply in disaster areas and temporary construction sites. Delivery and Support VGRID POWER (VGRID) provides integrated delivery covering on-site assessment, system design, core equipment manufacturing (PCS/STS/BESS/MPS), commissioning and remote O&M. Please contact us for customized solutions and quotations. ### FAQ **Q: Can a mobile energy storage vehicle connect to the grid and feed power in?** Yes. The onboard PCS can connect to the grid to provide short-term support for the distribution area, and can also operate off-grid to supply power on site. **Q: Is transport and deployment convenient?** Integrated vehicle-mounted cabinet, plug-and-play on arrival, no civil works required, and multiple vehicles can be paralleled for capacity expansion. **Q: How long can it supply power on a single full charge?** Depending on capacity and load, it typically supports temporary loads for several hours to several days. **Q: Can it drive motor-type equipment?** Yes, the PCS supports inductive load starting and seamless switching between grid-connected and off-grid modes. # Solar-Storage-Diesel AC/DC Coupled Microgrid Solution An industrial and commercial AC/DC hybrid microgrid combining PV, diesel generators, energy storage and the grid, balancing economics and resilience. Solution Overview Designed for industrial and commercial parks that already have grid access but face significant fluctuations, this solution uses an AC/DC coupled architecture to flexibly integrate PV, diesel generators, energy storage and the main grid. Key Points PV and batteries connect directly on the DC side, reducing conversion stages and improving efficiency Easy multi-port expansion Delivers both economics and resilience Phased retrofit without disrupting the existing distribution system Applicable Scenarios and Challenges A single grid-connected supply is affected by electricity prices and curtailment; a purely off-grid setup is costly. The goal is to balance economics with uninterrupted power resilience. VGRID System Composition **Power Conversion System (PCS)**: the core of AC/DC coupling, coordinating multiple sources in a unified manner. **Static Transfer Switch (STS)**: seamless grid-connected/off-grid switching to protect critical loads. **Battery Energy Storage System (BESS)**: multi-timescale support, enabling both arbitrage and backup power. **Energy Management System (EMS)**: optimization based on electricity prices, load and carbon targets. **Microgrid AC Cabinet (MPS)**: an AC/DC coupling cabinet with integrated multi-port capability. Core Value Delivers both economics and resilience Multi-energy complementarity, maximizing green power Uninterrupted power for critical loads Can be built in phases according to the park's needs Typical Applications Suitable for industrial parks, bonded zones and industrial and commercial clusters requiring highly reliable power supply. Delivery and Support VGRID POWER (VGRID) provides integrated delivery from site assessment, system design and core equipment manufacturing (PCS/STS/BESS/MPS) to commissioning and remote O&M. Please contact us for customized solutions and quotations. ### FAQ **Q: What is the difference between AC/DC coupling and pure AC coupling?** AC/DC coupling connects PV and batteries directly on the DC side, reducing conversion stages, improving efficiency, and facilitating multi-port expansion. **Q: Is retrofitting an existing campus complicated?** MPS/PCS supports grid-connection point access nearby, enabling phased construction without affecting the existing power distribution. **Q: What campus size is AC/DC coupling suitable for?** It suits commercial and industrial campuses from several hundred kW to several MW. **Q: What is the role of diesel in a coupled system?** It serves as backup and peak shaving, with the EMS optimizing its minimum run time. # Hydropower and Diesel Generator VSG Grid-Forming Solution VSG grid-forming solar-plus-storage solution, delivering grid-formable, reliable green power supply for remote areas. Solution Overview In weak-grid or islanded areas, grid-forming (VSG) PCS units enable solar-plus-storage to provide voltage and frequency support to the system just like synchronous machines. Key Points VSG grid-forming: PCS emulates a synchronous machine Active voltage and frequency support in weak grids Higher renewable hosting capacity, fewer disconnections Black-start capable, enhanced resilience Applicable Scenarios and Challenges Remote areas relying solely on hydropower or diesel generation have low system inertia and unstable voltage and frequency; once renewables are connected, oscillation and disconnection become likely. VGRID System Composition **Power Conversion System (PCS)**: VSG grid-forming PCS, emulating synchronous machine inertia and actively supporting voltage and frequency. **Static Transfer Switch (STS)**: Seamless grid-connected/islanded switching, black-start support. **Battery Energy Storage System (BESS)**: Provides inertia and primary frequency regulation, smoothing fluctuations. **Energy Management System (EMS)**: Coordinates hydropower/diesel/solar/storage output to maintain system stability. **Microgrid AC Cabinet (MPS)**: Grid-forming-class AC cabinet with integrated protection and synchronization. Core Value Improves system inertia and stability Renewable-friendly integration, fewer disconnections Reduces diesel generator start/stop cycles and fuel consumption Black-start capable, enhanced resilience Typical Applications Suitable for grid-forming power supply in mountainous small hydropower stations, border weak-grid areas and off-grid communities. Delivery and Support VGRID POWER (VGRID) provides integrated delivery covering site assessment, system design, core equipment manufacturing (PCS/STS/BESS/MPS), commissioning and remote O&M. Contact us for customized solutions and quotations. ### FAQ **Q: What is VSG grid-forming?** Virtual synchronous machine technology enables the energy storage converter to emulate generator inertia and damping, actively supporting the grid rather than merely following it. **Q: Why do weak grid areas need grid-forming?** Weak grids have low inertia, and grid-following equipment is prone to instability; grid-forming equipment can establish voltage and frequency on its own, improving renewable energy hosting capacity. **Q: How much does VSG cost compared with a conventional PCS?** VSG is a control strategy upgrade with similar hardware, offering high cost-effectiveness. **Q: Can old hydro or diesel generator sets be reused?** Yes, VSG can be easily paralleled and coordinated with existing hydro turbines and diesel engines. # Middle East Villa Energy Storage Solution Delivering stable, reliable power protection for luxury residential and commercial villa scenarios, addressing grid fluctuations and outages. Solution Overview For villas and high-end residences in the Middle East's high-temperature, high-solar-irradiance regions, we provide a stable, reliable residential solar-plus-storage solution. Key Points Stable power supply for villas/commercial residences in high temperatures High-temperature-adapted cells + thermal management/fire protection design STS seamless switching, air conditioning without interruption Addressing outages and electricity price fluctuations Applicable Scenarios and Challenges High temperatures drive high air-conditioning loads; grid fluctuations and occasional outages affect comfort and safety; diesel backup is costly and offers a poor experience. VGRID System Composition **Power Conversion System (PCS)**: High-efficiency bidirectional conversion, supporting PV and battery coordination. **Static Transfer Switch (STS)**: Seamless switching between grid and microgrid, ensuring uninterrupted power for the entire home. **Battery Energy Storage System (BESS)**: High-temperature-adapted cells, long lifespan, safe. **Energy Management System (EMS)**: Scheduling based on usage habits, prioritizing green power and backup power. **Microgrid AC Cabinet (MPS)**: Residential-grade AC cabinet, blending into the building's appearance. Core Value Seamless switching during outages, uninterrupted power for the entire home Stable operation in high-temperature environments Reduced diesel and electricity costs Enhanced residential comfort and asset value Typical Applications Suitable for villas, estates, and commercial residential communities in Gulf countries. Delivery and Support VGRID POWER (VGRID) provides integrated delivery from on-site assessment, system design, core equipment manufacturing (PCS/STS/BESS/MPS) to commissioning and remote O&M. Contact us for customized solutions and quotations. ### FAQ **Q: Is the battery safe in high-temperature environments?** High-temperature-adapted cells with thermal management and fire protection design are used; the MPS features over-temperature protection and isolation. **Q: Can it run the central air conditioning during a power outage?** Yes. The PCS capacity is sized to the whole-home load, and the STS switches seamlessly, so the air conditioning is not interrupted. **Q: What capacity is typically installed for villa energy storage?** It is sized according to the all-day load and backup duration, commonly in the tens of kWh range. **Q: How does it work with solar PV?** The PCS prioritizes consumption of rooftop PV, stores surplus energy, and switches seamlessly to off-grid during an outage. # Energy Storage Solutions for Small and Medium-Sized Factories Build factory-level PV-storage microgrids and demand management with core solutions such as SP250HAG2T / SP500HCG2. Solution Overview For small and medium-sized manufacturing enterprises, we provide standardized, phaseable PV-storage microgrid and demand management solutions for small and medium-sized factories. Key Points Factory-level PV-storage microgrid and demand management Flexible configuration of the SP series by capacity Demand management reduces basic electricity charges Phaseable, rolling investment based on returns Applicable Scenarios and Challenges High electricity costs as a proportion of total costs and large demand fluctuations; grid fluctuations can easily cause equipment downtime and defective products; limited budgets require rapid returns. VGRID System Composition **Power Conversion System (PCS)**: Models such as SP250HAG2T / SP500HCG2 support power conversion for small and medium-capacity factories. **Static Transfer Switch (STS)**: Protection and switching at the grid connection point. **Battery Energy Storage System (BESS)**: Peak shaving and valley filling, plus short-term backup power. **Energy Management System (EMS)**: Demand forecasting and strategy optimization to reduce basic electricity charges. **Microgrid AC Cabinet (MPS)**: Factory-level AC cabinet with integrated metering. Core Value Reduction in both energy charges and demand charges More stable power supply, reducing downtime and defective products Standardized solution with fast delivery and clear returns Phaseable capacity expansion in line with production capacity Typical Applications Suitable for small and medium-sized manufacturing factories such as injection molding, hardware, food, and textiles. Delivery and Support VGRID POWER (VGRID) provides integrated delivery from on-site assessment, system design, and core equipment manufacturing (PCS/STS/BESS/MPS) to commissioning and remote O&M. You are welcome to contact us for customized solutions and quotations. ### FAQ **Q: How can small and medium-sized factories with limited budgets get started?** A phased approach can be adopted: start with demand management, then expand with PV and energy storage, and invest on a rolling basis according to returns. **Q: Can standard models meet customization needs?** The SP series covers common small and medium capacities, and MPS/EMS can be configured according to process requirements and transformer capacity. **Q: Roughly how much load can one system cover?** Configured according to transformer capacity, commonly at the several-hundred-kW level, covering the peak and off-peak periods of the main production line. **Q: Which loads can the KMU protect during a power outage?** The EMS prioritizes critical process and security loads, while non-critical loads can be shed. # PV Local Consumption Storage Solution Smooths transformer impact and curtails PV clipping during peak generation, improving self-consumption rate and revenue. Solution Overview For commercial and industrial rooftops and parks with existing or new distributed PV, paired storage improves PV self-consumption and reduces curtailment. Key Points PV+storage improves self-consumption rate and revenue Smooths PV fluctuations, protects transformers Reduces curtailment and power factor penalties Demand management and peak shaving Applicable Scenarios and Challenges During peak PV generation, local consumption is insufficient; reverse feed causes transformer impact, output limitation and power factor penalties; at night without PV, grid purchase is still required. VGRID System Composition **Power Conversion System (PCS)**: Enables coordinated conversion between PV and battery, smoothing output. **Static Transfer Switch (STS)**: Protection switching at the grid connection point. **Battery Energy Storage System (BESS)**: Stores solar energy at midday, discharges in the evening, boosting self-consumption. **Energy Management System (EMS)**: Optimizes charging and discharging based on PV output and load forecasts. **Microgrid AC Cabinet (MPS)**: Rooftop/park-level AC cabinet. Core Value Higher self-consumption rate, lower electricity bills Reduced curtailment and reverse feed impact Lower power factor and capacity charges Improved PV project revenue Typical Applications Suitable for distributed PV with storage at factory rooftops, logistics parks and commercial complexes. Delivery and Support VGRID POWER provides integrated delivery from site assessment, system design, core equipment manufacturing (PCS/STS/BESS/MPS) to commissioning and remote O&M. Contact us for customized solutions and quotations. ### FAQ **Q: Where does the main revenue from PV-plus-storage come from?** It comes from improving the self-consumption rate (buying less peak-price electricity), reducing curtailment and power factor penalties, and demand management. **Q: What if the roof load capacity is insufficient?** Ground-mounted cabinets or a modular layout can be used, and the PCS/MPS supports phased connection. **Q: How large is the storage typically sized for PV-plus-storage?** It is sized according to installed capacity and the self-consumption gap, commonly at 10–30% of installed capacity. **Q: Can it be stacked with peak-valley arbitrage?** Yes, the same system handles both self-consumption improvement and peak-valley arbitrage, with unified EMS scheduling. # Embedded Software Engineer (EMS / Control) Responsible for embedded software development and on-site commissioning of microgrid EMS and PCS controllers. Responsibilities Develop embedded control software (C/C++) for PCS / STS / EMS Implement grid-connected/off-grid switching, VSG and multi-unit parallel logic Support on-site commissioning for overseas projects Requirements Familiar with RTOS, CAN/Modbus and power electronics control Experience in energy storage or industrial control is preferred Good cross-team communication skills # Peak-Valley Arbitrage Energy Storage Solution Empowered by core PCS for commercial and industrial peak-valley arbitrage: charge during valley hours, discharge during peak hours, significantly cutting electricity costs. Solution Overview For commercial and industrial users under time-of-use tariffs, energy storage enables peak-valley arbitrage through "charge low, discharge high," reducing overall electricity costs. Key Points Peak-valley arbitrage: charge during valley hours, discharge during peak hours High cycle efficiency PCS Long-life cells supporting two charge-discharge cycles per day Reduction of energy charges and demand charges Applicable Scenarios and Challenges High peak tariffs and high demand levels mean electricity costs account for a large share of operating costs; there is substantial room for optimizing demand charges and power factor adjustment charges. VGRID System Composition **Power Conversion System (PCS)**: High-efficiency bidirectional conversion, ensuring high cycle efficiency and grid-friendly operation. **Static Transfer Switch (STS)**: Protection and switching at the grid connection point, with safe isolation. **Battery Energy Storage System (BESS)**: Long-life cells supporting two charge-discharge cycles per day. **Energy Management System (EMS)**: Develops charge-discharge strategies based on tariff curves and demand forecasts. **Microgrid AC Cabinet (MPS)**: Factory-grade AC cabinet integrating metering and fire protection interfaces. Core Value Significant reduction in energy charges Demand management lowering demand charges Participation in demand response for additional revenue Clear and measurable investment payback period Typical Applications Suitable for commercial and industrial users with large load fluctuations, such as manufacturing, industrial parks, cold chain, and data centers. Delivery and Support VGRID POWER (VGRID) provides integrated delivery from site assessment, system design, and core equipment manufacturing (PCS/STS/BESS/MPS) to commissioning and remote O&M. Contact us for customized solutions and quotations. ### FAQ **Q: What mainly determines peak-valley arbitrage revenue?** The peak-valley price spread, round-trip efficiency and the local tariff mechanism; the larger the spread and the more charge-discharge cycles, the higher the revenue. **Q: Is the energy storage system lifespan sufficient?** Long-life cells are used together with EMS optimization of depth of discharge to ensure many years of economical cycling. **Q: How many charge-discharge cycles per day?** Typically two charges and two discharges, determined by the price spread and the EMS strategy. **Q: Is new distribution equipment required?** Usually it is connected to the grid-connection point nearby, with an integrated MPS/PCS, so modification work is minimal. # Distribution Area Energy Storage Voltage Governance Solution Eliminate high/low voltage at rural line ends and three-phase imbalance, improve voltage compliance rate, and accelerate local PV consumption. Solution Overview To address voltage limit violations, three-phase imbalance and low voltage at the ends of rural and suburban distribution areas, grid-connected energy storage is used for active voltage governance. Key Points Energy storage governs line-end voltage and three-phase imbalance Second-level active and reactive power support, no new lines required PV can be fully connected to the grid after governance Improves the voltage compliance rate of the distribution area Applicable Scenarios and Challenges Long line ends and dispersed loads, with high/low voltage and three-phase imbalance, cause equipment shutdown, PV curtailment and damage to household appliances. VGRID System Composition **Power Conversion System (PCS)**: As a grid-connected converter, it rapidly absorbs/delivers reactive and active power to regulate node voltage. **Static Transfer Switch (STS)**: Provides protection and switching at the grid-connection point, isolating the system during maintenance. **Battery Energy Storage System (BESS)**: Provides active power support and short-term power buffering to smooth fluctuations. **Energy Management System (EMS)**: Controls charging and discharging according to voltage thresholds and three-phase imbalance rate strategies. **Microgrid AC Cabinet (MPS)**: Distribution-area-level AC cabinet integrating metering and protection. Core Value Significant improvement in voltage compliance rate Improved three-phase imbalance, reducing line losses and equipment damage Releases distribution transformer and line capacity, accelerating PV integration No large-scale line renovation required, fast deployment Typical Applications Suitable for rural distribution areas, suburban line ends and areas with concentrated distributed PV integration. Delivery and Support VGRID POWER (VGRID) provides integrated delivery from site assessment, system design and manufacturing of core equipment (PCS/STS/BESS/MPS) to commissioning and remote O&M. Please contact us for customized solutions and quotations. ### FAQ **Q: How does energy storage voltage management differ from traditional voltage regulation?** Energy storage can provide both active and reactive power support with second-level response, without building new lines or replacing transformers with larger ones. **Q: Will it affect the existing PV grid connection?** On the contrary, once voltage is managed and within limits, PV can connect to the grid at full capacity and curtailment is reduced. **Q: Where is distribution-area energy storage typically installed?** Near the distribution transformer on the side where end-of-line voltage exceeds limits, where local support is fastest. **Q: What about the investment and returns?** Lower cost than building new lines or replacing transformers, with payback from reduced line losses and higher PV revenue. # Hotel PV-Diesel-Storage Microgrid Solution Stable, economical and green power supply for island and remote hotels, enhancing the guest experience. Solution Overview PV-storage-diesel microgrids for island resorts, eco-hotels and remote camps, balancing reliable power supply, cost and green branding. Key Points Integrated PV, storage and diesel for stable power supply to island/remote hotels STS ensures seamless, uninterrupted power to guest rooms BESS and low-noise design reduce diesel noise and emissions Payback period of about 3–5 years for island hotels with high electricity prices Application Scenarios and Challenges Island hotels rely on diesel, with high electricity prices, noise and emissions affecting the guest experience; peak tourist season loads are high, and power supply reliability directly affects reputation. VGRID System Composition **Power Conversion System (PCS)**: flexibly dispatches PV/diesel/storage to support air conditioning, lighting and kitchen appliance loads. **Static Transfer Switch (STS)**: switches between the grid/diesel generator and the microgrid, ensuring uninterrupted power to guest rooms. **Battery Energy Storage System (BESS)**: performs peak shaving and valley filling, smooths the evening peak and reduces diesel generator operating hours. **Energy Management System (EMS)**: dispatches based on occupancy rates and weather forecasts to maximize green power. **Microgrid AC Cabinet (MPS)**: low-noise AC cabinet suited to hotel environments. Core Value Reduces diesel and electricity costs Quiet and green, enhancing the guest experience and brand image Uninterrupted power for critical loads, avoiding negative reviews Visualized management for easier hotel operations Typical Applications Suitable for island resorts, eco-camps and remote scenic-area hotels. Delivery and Support VGRID POWER (VGRID) provides integrated delivery from site assessment, system design and core equipment manufacturing (PCS/STS/BESS/MPS) to commissioning and remote O&M. Contact us for customized solutions and quotations. ### FAQ **Q: Will a hotel microgrid affect the guest experience?** No. STS seamless switching keeps guest rooms powered without interruption, while the BESS and low-noise design reduce diesel noise and emissions. **Q: What is the approximate payback period?** For high-electricity-price island hotels, payback is typically 3–5 years, depending on diesel prices and solar irradiance. **Q: How does a hotel microgrid work with the municipal grid?** In grid-connected operation it prioritizes solar power; during an outage the STS automatically switches to off-grid mode, with no noticeable impact on guests. **Q: Do existing diesel generators need to be removed?** No. They can be retained as backup, and the EMS starts them only when solar and storage are insufficient. # Commercial & Industrial PV + Storage (Off-Grid) Solution For commercial and industrial sites where grid connection is difficult or off-grid backup power is required, an integrated PV and storage system safeguards critical loads. Solution Overview For commercial and industrial customers facing difficult grid connection, an unstable grid, or a mandatory off-grid power supply, we provide an integrated PV and storage microgrid to safeguard production and critical loads. Key Points Integrated PV and storage, suited to difficult grid connection or backup power scenarios STS ensures seamless, uninterrupted power for critical loads Can serve as primary supply or backup, flexibly configured PCS power quality meets the needs of variable frequency drives and PLCs Application Scenarios and Challenges In some regions, capacity expansion is restricted and grid connection takes a long time; alternatively, grid fluctuations or power rationing disrupt continuous production, and critical processes cannot tolerate power interruption. VGRID System Composition **Power Conversion System (PCS)**: Provides unified conversion between PV, battery and loads, and supports off-grid operation. **Static Transfer Switch (STS)**: Switches seamlessly between the main grid and the microgrid, protecting automated production lines. **Battery Energy Storage System (BESS)**: Stores PV energy to secure supply and smooth production load fluctuations. **Energy Management System (EMS)**: Dispatches according to the production plan, prioritising green power and reducing demand charges. **Microgrid AC Cabinet (MPS)**: Factory-level AC cabinet with integrated metering and protection. Core Value Escape grid connection constraints and start production quickly Uninterrupted power for critical loads, ensuring continuous production Self-consumption of green power, reducing electricity costs Modular deployment, scalable with production capacity Typical Applications Suitable for new industrial parks, border factories, data centres and production lines with high requirements for power supply reliability. Delivery and Support VGRID POWER (VGRID) provides integrated delivery covering site assessment, system design, manufacture of core equipment (PCS/STS/BESS/MPS), commissioning and remote O&M. Contact us for a customised solution and quotation. ### FAQ **Q: Can an off-grid solar-plus-storage system fully replace the utility grid?** For sites where grid connection is difficult or power supply must be guaranteed, it can serve as the main supply; typically a diesel generator is configured or a grid connection interface is retained as an extreme fallback. **Q: Is it compatible with production line automation equipment?** The STS provides seamless switching, and the power quality delivered by the PCS meets the requirements of variable frequency drives and PLCs. **Q: What size off-grid solar-plus-storage system is typically used for commercial and industrial applications?** It is configured modularly based on critical load power and backup duration, ranging from several hundred kW to the MW level. **Q: How does the system switch between grid-connected and off-grid modes?** The STS switches automatically within milliseconds, with no perceptible impact on loads; the EMS coordinates the entire process. # Oilfield Production Microgrid Solution A solar-diesel-storage microgrid for gobi oilfields, reducing diesel consumption and carbon emissions at remote well sites while improving power supply resilience. Solution Overview For remote oilfield well sites in gobi and desert regions, a microgrid is built with PV, energy storage and diesel generation to reduce energy consumption per ton of oil produced and carbon emissions. Key Points Solar-diesel-storage for gobi oilfields, reducing diesel fuel consumption and carbon emissions Explosion-proof AC cabinet design, meeting oil and gas zone requirements BESS absorbs pumping unit regenerative energy and smooths impact loads Improves power supply resilience for remote oil production Applicable Scenarios and Challenges Well sites are scattered and grid power is unavailable, making diesel transport and on-site staffing costly; continuous oil production demands extremely high power supply continuity. VGRID System Composition **Power Conversion System (PCS)**: Compatible with cyclic impact loads such as pumping units (nodding donkeys), ensuring stable power conversion. **Static Transfer Switch (STS)**: Switches between diesel generation and the microgrid to prevent power loss during pumping unit start/stop. **Battery Energy Storage System (BESS)**: Absorbs pumping unit regenerative energy and smooths cyclic loads, reducing diesel generation output. **Energy Management System (EMS)**: Dispatches according to well site conditions, maximizing PV self-consumption and reducing idle losses. **Microgrid AC Cabinet (MPS)**: Explosion-proof AC cabinet, meeting safety requirements for oil and gas zones. Core Value Lower diesel consumption and transport costs Improved pumping continuity, reducing losses from well shutdowns Lower well site carbon emissions, supporting energy companies' dual carbon goals Unmanned/minimally staffed operation with remote O&M Typical Applications Suitable for off-grid or weak-grid power supply at desert oilfields, marginal well sites and gathering and transportation stations. Delivery and Support VGRID POWER (VGRID) provides integrated delivery from site assessment, system design and core equipment manufacturing (PCS/STS/BESS/MPS) to commissioning and remote O&M. Contact us for customized solutions and quotations. ### FAQ **Q: How is equipment safety ensured in oilfield areas?** The AC cabinet uses an explosion-proof design, and the system provides arc and leakage current protection, meeting explosion-proof standards for oil and gas areas. **Q: Will the cyclic load of the pumping unit damage the battery?** The PCS and BESS work together to absorb regenerative energy and smooth out surges, while the EMS optimizes charging and discharging to extend battery life. **Q: How much diesel can an oilfield microgrid save?** With optimization based on irradiance and load, typical diesel savings are 30–60%, improving with better solar resources. **Q: Are the devices durable in dusty and high-temperature environments?** Core equipment has a high IP rating and resists dust and thermal drift, while remote EMS reduces on-site inspections. # Microgrid Solution for Remote Farms Empower remote farms with solar-plus-storage systems for a reliable, green supply of power for irrigation, processing and daily life. Solution Overview For remote farms, ranches and agricultural parks that are difficult to reach with the grid, we provide an integrated solar-plus-storage microgrid to secure power for irrigation, processing and daily life. Key Points Integrated solar and storage to secure irrigation, processing and daily-life power PCS drives inductive loads such as water pumps, while the BESS covers peak demand STS provides seamless switching when the grid arrives In the dry season, the EMS automatically starts the diesel generator as backup Applicable Scenarios and Challenges Irrigation and cold storage depend heavily on diesel or fuel generators, which are costly and noisy; extending the grid requires large investment and offers slow returns. VGRID System Composition **Power Conversion System (PCS)**: supports direct PV supply and battery charging/discharging, and drives water pumps and processing equipment. **Static Transfer Switch (STS)**: switches between the main grid/diesel generator and the microgrid to keep the cold chain powered. **Battery Energy Storage System (BESS)**: stores solar energy during the day and discharges it during peak water use to smooth irrigation loads. **Energy Management System (EMS)**: schedules according to farming seasons and sunlight, prioritizing green power and reducing fuel costs. **Microgrid AC Cabinet (MPS)**: a corrosion-resistant AC cabinet suited to the humid and fertilizer-laden farm environment. Core Value Lower energy costs for irrigation and processing More stable cold chain and drinking water supply Less diesel generator maintenance and noise Scalable with the size of the farming operation Typical Applications Suitable for plain farms, mountain tea plantations, livestock ranches and primary agricultural processing sites. Delivery and Support VGRID POWER (VGRID) provides integrated delivery from site assessment and system design to core equipment manufacturing (PCS/STS/BESS/MPS), commissioning and remote O&M. Contact us for a customized solution and quotation. ### FAQ **Q: Can a farm microgrid drive high-power water pumps?** Yes. The PCS supports the startup of inductive loads such as water pumps, the BESS provides the startup surge, and the STS switches seamlessly when the grid is available. **Q: How can irrigation be kept running on cloudy and rainy days?** The EMS prioritizes battery dispatch and, when necessary, automatically starts and stops the diesel generator as a backup to safeguard critical irrigation windows. **Q: What size of area is a farm microgrid suitable for?** It is configured modularly according to irrigation power and daily load, from a single well to an entire greenhouse complex. **Q: Is battery life greatly affected by seasons?** The EMS optimizes depth of discharge and temperature management, and together with long-life cells, ensures stable operation for many years. # Africa Mining Microgrid Solution An off-grid microgrid combining wind, PV, diesel generation and energy storage for continuous mine production and reduced diesel dependence. Solution Overview To address the lack of grid access in remote mining areas in Africa, an off-grid AC-coupled microgrid is built with wind turbines, PV, diesel generators and energy storage to ensure continuous operation of mining and processing. Key Points Wind/PV/diesel/storage multi-energy complementarity, designed specifically for off-grid mine sites Multiple PCS units in parallel support high-power loads such as crushing and hoisting BESS smooths start/stop surges and provides black start capability Significantly reduces diesel costs and carbon emissions Application Scenarios and Challenges Mine sites are far from the grid, diesel must be transported over long distances at high cost with unstable supply, and production stoppages cause huge losses; carbon emissions and ESG pressure are also rising. VGRID System Composition **Power Conversion System (PCS)**: Multiple units in parallel support large-capacity loads and enable unified conversion and dispatch of wind/PV/diesel/storage. **Static Transfer Switch (STS)**: Fast switching between diesel generators and the microgrid to avoid start/stop surges from large equipment. **Battery Energy Storage System (BESS)**: Provides high-power frequency regulation and peak support, smoothing surge loads such as mine truck charging. **Energy Management System (EMS)**: Dispatch based on production schedules and economics, prioritizing wind and PV consumption and starting/stopping diesel generators as appropriate. **Microgrid AC Cabinet (MPS)**: Mining-grade protection and AC distribution, suited to dusty, vibrating and high-temperature environments. Core Value Reduces diesel consumption by 30–50% and cuts long-distance transport costs Improves power supply continuity and reduces production stoppage losses Meets mining ESG and carbon reduction requirements Can be expanded as production capacity grows Typical Applications Suitable for off-grid power supply and capacity expansion at gold, copper and aggregate mine sites. Delivery and Support VGRID POWER (VGRID) provides integrated delivery from site assessment, system design and core equipment manufacturing (PCS/STS/BESS/MPS) to commissioning and remote O&M. Contact us for customized solutions and quotations. ### FAQ **Q: Can a mining microgrid support large crushing and hoisting equipment?** Yes. The PCS supports multi-unit parallel connection and high-power output, the BESS provides peak shaving and frequency regulation, and the STS isolates start-stop surges. **Q: How can the risk of power outages at a mine site be controlled?** The EMS monitors in real time, the diesel generator serves as backup power, and BESS black start ensures critical loads are restored first. **Q: How should wind and solar be proportioned at a mining site?** Optimize according to resource and load profiles. The EMS prioritizes consumption of wind and solar, and diesel is started only under extreme conditions or when resources are insufficient. **Q: The mining environment is harsh. How reliable is the equipment?** The core cabinets have a high protection rating and tolerate dust and temperature variations, and the modular design allows quick on-site replacement. # Microgrid Solution for African Villages The PV-diesel-storage hybrid microgrid provides stable, economical and green power for villages without electricity, supporting basic education and healthcare services. Solution Overview For villages in Sub-Saharan Africa and similar regions that have no electricity or extremely weak supply, we build PV-diesel-storage hybrid microgrids so that villagers can access stable, economical and green power. Key Points PV/diesel/storage hybrid, designed specifically for villages without electricity EMS remote monitoring, with automatic start/stop of diesel generators as backup Stable power supply for village schools, clinics and households Lower cost and cleaner than diesel-only supply Application Scenarios and Challenges Villages have long been without electricity or rely only on small diesel generators for intermittent supply, making it difficult to guarantee power for education, healthcare, lighting and processing, while electricity costs remain high. VGRID System Composition **Power Conversion System (PCS)**: supports parallel operation of PV and diesel generators, with flexible charge/discharge control to adapt to village load fluctuations. **Static Transfer Switch (STS)**: seamless switching when the main grid occasionally reaches the area or when diesel generators start and stop, ensuring power for village public loads. **Battery Energy Storage System (BESS)**: stores solar energy during the day and supplies power at night, smoothing day-night and weather fluctuations. **Energy Management System (EMS)**: dispatches according to village daily routines and load curves, extending battery life and reducing diesel consumption. **Microgrid AC Cabinet (MPS)**: an integrated AC cabinet with dust-proof and insect-proof design, suited to African field environments. Core Value Ends the history of no electricity, supporting schools, clinics and farmers' production More economical and cleaner than diesel-only generators Remote monitoring and O&M, reducing on-site manpower Phased expansion according to village scale Typical Applications Suitable for centralized power supply in Sub-Saharan African villages, border settlements and agricultural cooperatives. Delivery and Support VGRID POWER (VGRID) provides integrated delivery from site assessment, system design and core equipment manufacturing (PCS/STS/BESS/MPS) to commissioning and remote O&M. Please contact us for customized solutions and quotations. ### FAQ **Q: Is O&M for a village microgrid difficult?** The system is remotely monitored by the EMS, with fault pre-warning; core equipment is modular, so on-site replacement only requires a basic electrician. **Q: How is billing handled for a village without a grid?** A communal metering point or household prepaid meters can be configured, selling electricity under a village operator model, flexibly suited to off-grid communities. **Q: What if solar generation is insufficient or there are consecutive rainy days?** The EMS automatically dispatches the diesel generator as backup, while energy storage smooths fluctuations, ensuring basic daily electricity supply is not interrupted. **Q: What is the approximate investment for a single village, and how does payback work?** Configured modularly according to household count and load, it can significantly reduce costs compared with long-term fuel expenditure on diesel alone, with payback improving as diesel prices rise. # Island Microgrid Solution Build a 24-hour stable green power supply with PV, storage and diesel, replacing high-cost diesel gensets, covering remote islands in Southeast Asia and Africa. Solution Overview For remote islands in Southeast Asia, Africa and the Pacific, a PV-storage-diesel microgrid is built with photovoltaic, diesel/gas generation and energy storage to replace high-cost, high-emission diesel gensets and provide 24-hour stable green power. Key Points Diesel replacement rate can reach 60–80%, significantly reducing fuel and O&M costs Static transfer switch (STS) enables <10 ms grid-connected/off-grid transfer Integrated core equipment: PCS / STS / BESS / EMS / MPS Provides 24/7 off-grid stable green power, supporting black start and frequency regulation Application Scenarios and Challenges Island grids are isolated, fuel transport costs are high, diesel genset O&M is difficult and emissions are high; load fluctuates noticeably during peak tourist seasons, placing high demands on power supply reliability. VGRID System Composition **Power Conversion System (PCS)**: as the AC/DC coupling core, it enables PV MPPT, battery charging and discharging, and seamless parallel operation with diesel gensets. **Static Transfer Switch (STS)**: millisecond-level transfer between the utility/diesel genset and the microgrid, ensuring uninterrupted power for critical loads such as hotels, communications and medical facilities. **Battery Energy Storage System (BESS)**: smooths PV fluctuations, performs peak shaving and valley filling, and provides off-grid black start and frequency regulation support. **Energy Management System (EMS)**: dispatches PV/diesel/storage based on load and irradiance forecasts to maximize the green power ratio and minimize fuel consumption. **Microgrid AC Cabinet (MPS)**: integrates combiner, protection and AC distribution, simplifying on-site assembly and O&M on islands. Core Value Diesel replacement rate can reach 60–80%, significantly reducing fuel and O&M costs Higher green power ratio, meeting the requirements of island eco-tourism and carbon reduction Seamless transfer ensures critical loads such as tourism, communications and medical facilities Modular deployment, enabling smooth capacity expansion as island demand grows Typical Applications Deployed on multiple remote islands in Southeast Asia and Africa, covering power supply for villages, resorts and communication base stations. Delivery and Support VGRID POWER (VGRID) provides integrated delivery from site assessment, system design and core equipment manufacturing (PCS/STS/BESS/MPS) to commissioning and remote O&M. Please contact us for customized solutions and quotations. ### FAQ **Q: Can an island microgrid completely eliminate diesel generators?** On high-irradiance islands with sufficient solar and energy storage capacity, diesel use can be significantly reduced, but most projects retain diesel or gas as backup for extreme weather, with a typical diesel replacement rate of 60–80%. **Q: How is uninterrupted power for critical loads ensured in off-grid conditions?** Millisecond-level grid-connected/off-grid switching is achieved via a static transfer switch (STS), with the BESS providing black start and frequency regulation support. **Q: What capacity does VGRID POWER typically build for island microgrids?** Modular configurations range from a few hundred kW for villages or base stations to several MW for resort islands, determined by load and resource assessment. **Q: How long does deployment of an island project usually take?** Standard modular solutions assemble quickly on site and typically enter operation within weeks to months, while remote EMS reduces the need for long-term on-site O&M. # 2026 Global Microgrid Market Outlook: Demand for Power Conversion Systems Keeps Rising Commercial and Industrial Energy Storage and Off-Grid Microgrids Advance Together, Making Standardized Delivery of PCS and STS the Key Factor. As electricity price volatility and demand for supply reliability increase, global microgrid installations will continue to grow in 2026. Commercial and industrial energy storage and off-grid projects in remote areas are the two main growth curves. Implications for the Supply Chain Standardized PCS and STS that can be delivered quickly have become key factors in EPC selection. Whoever can offer shorter lead times and a more complete certification package is more likely to win overseas orders. Commercial and industrial energy storage: peak-valley arbitrage and demand management Off-grid microgrids: PV-storage-diesel hybrid systems and weak-grid support Standardized cabinets and pre-certification are becoming delivery trends # How to Compare PCS Ratings: kW vs kVA, ATS vs STS and Parallel Limits A buyer’s checklist for reading PCS datasheets, separating active from apparent power and checking transfer and expansion claims. A PCS datasheet is useful only when the ratings are compared on the same basis. Check the AC output, battery limits, transfer equipment and expansion statement together rather than selecting from a headline power value. kW and kVA answer different questions **kW is active power**, the rate at which useful real energy is delivered. **kVA is apparent power**, which also reflects current and voltage. At a specified power factor, kW = kVA × PF. For example, 750 kVA at PF 0.9 corresponds to 675 kW; this arithmetic example is not a rating for a particular VGRID model. Read the rated power factor, continuous output, overload curve and current limit on the actual datasheet. An ATS typically transfers between sources using electromechanical switching. An STS uses solid-state devices and is commonly selected where a faster transfer is needed. Verify synchronization, neutral switching, bypass, fault rating, control logic and interruption time for the system. LEONA-B750K’s brochure describes automatic grid/off-grid transfer under 20 ms; confirm test conditions and the supplied switching arrangement rather than assuming a separate STS is always required. ATS and STS: source transfer is a system function An ATS typically transfers between sources using electromechanical switching. An STS uses solid-state devices and is commonly selected where a faster transfer is needed. Neither label alone establishes the complete transfer sequence: verify source synchronization, neutral switching, bypass, fault rating, control logic and the specified interruption time. For VGRID STS equipment, use the datasheet for the selected STS rating; do not assume the PCS cabinet includes it. LEONA-B750K lists STS as external/optional. Check every interface Battery rated voltage and maximum voltage, charge/discharge current and DC protection. PV MPPT voltage window, maximum PV voltage, input current and channel count. AC voltage, frequency, phase/wire arrangement, power factor and short-circuit contribution. Grid-following/grid-forming modes, islanding, generator interface and transfer device. Ambient temperature, altitude, enclosure rating, derating and noise where relevant. Read parallel claims as a design condition “Parallel capable” does not say how many units can operate together or what total output remains under site conditions. Ask for the approved cabinet count, controller and firmware versions, communications topology, protection settings and commissioning procedure. SP250HAG2T specifies up to three units in parallel. LEONA-B750K supports multiple cabinets, while the project maximum must be engineered and confirmed. Documents to request Ask for a configuration-specific datasheet, terminal and interface drawing, single-line diagram, transfer timing statement, parallel-control note, protection requirements and certificates applicable to the supplied build. This lets the EPC or electrical designer check the PCS against the battery, PV array, generator and utility rules. Compare [SP250HAG2T](/en/product/sp250hag2t), [SP375/500HAG2](/en/product/sp375-500hag2) and [LEONA-B750K](/en/product/sp750h54pstd-2) using the same power-factor and operating assumptions. ### FAQ **Q: What is the difference between kW and kVA?** kW measures active power; kVA measures apparent power. For a stated power factor, kW = kVA × PF, so both ratings and the permitted power-factor range must be checked. **Q: Are ATS and STS the same?** No. ATS generally uses mechanical switching to transfer sources; STS uses solid-state switching for faster transfer. Actual transfer time and supported source conditions must be taken from the selected equipment datasheet. **Q: Can I add PCS cabinets in parallel later?** Only if the cabinet, controller, firmware, communications, protection and AC system are designed for the expanded parallel group. Confirm a maximum approved count before purchase. # Overseas Sales Manager (Middle East / Africa / Southeast Asia) Responsible for regional market development, channel building, and EPC customer relationship management. Job Responsibilities Develop and maintain EPC, distributor, and system integrator customers within the region Complete quotations, bids, and contract negotiations Collect market and competitor information, and feed back product requirements Job Requirements English as a working language; proficiency in Arabic/French is preferred Overseas sales experience in the power electronics or new energy industry Willing to accept medium- to long-term overseas business trips # What new requirements do the new grid-connection standards place on PCS High and low voltage ride-through, primary frequency regulation and harmonic limits are stricter, and these points require close attention during selection. The new grid-connection standards place higher demands on the grid support capability of power conversion systems. High and low voltage ride-through, primary frequency regulation response and harmonic limits have all been updated. Selection Recommendations When purchasing a PCS, it is advisable to verify the device's low voltage ride-through curve, frequency regulation response time and THDi figures, and to request third-party test reports. Low voltage ride-through: longer zero voltage ride-through time Primary frequency regulation: faster response time Grid-connection harmonics: stricter THDi limits # Supply Chain Specialist (Procurement / Planning) Responsible for material procurement, supplier management, and production planning coordination. Job Responsibilities Procurement and lead time management of key materials (IGBT, battery cells, magnetic components) Supplier development, evaluation, and performance management Collaborate with production and sales to formulate and adjust production plans Job Requirements Bachelor's degree or above in supply chain, logistics, or an engineering discipline Familiar with ERP and procurement processes, with cost awareness Detail-oriented, able to work under pressure, and possessing strong coordination skills # Tamanrasset, Algeria 2.4 MW Off-Grid Solar-Storage Microgrid Off-grid power supply for a residential area deep in the Sahara Desert, with diesel consumption reduced by 78% and power supply availability reaching 99.6%. The project is located deep in the Sahara Desert, where the existing diesel generator sets had high power supply costs and poor reliability. VGRID POWER provided a 2.4 MWp PV + 6 MWh storage off-grid microgrid, equipped with 500 kW PCS and STS static transfer switches. Solution Highlights Coordinated PV-storage-diesel multi-source operation to maximize PV consumption STS completes source switching within 20 ms Remote monitoring and predictive maintenance After the system was commissioned, diesel consumption dropped by 78% and power supply availability rose to 99.6%. # LFP vs NMC Energy Storage Batteries: Which Should a Microgrid Choose An analysis of the differences between lithium iron phosphate (LFP) and nickel manganese cobalt (NMC) in safety, cycle life, energy density and temperature adaptability, with a selection comparison for microgrids. The choice of battery cells for an energy storage system directly determines safety and service life. Lithium iron phosphate (LFP) and nickel manganese cobalt (NMC) are the two mainstream options. Brief Conclusion For commercial and industrial and off-grid microgrids, **LFP** is preferred: good thermal stability, long cycle life and low cost; consider **NMC** only in scenarios with extremely high requirements for energy density and low-temperature performance. Item-by-Item Comparison **Safety** — LFP has a higher thermal runaway temperature and is less prone to fire; NMC has higher energy density but weaker thermal stability. **Cycle life** — LFP is typically 4000–6000 cycles; NMC is about 2000–3000 cycles. **Energy density** — NMC is higher and takes up less space; LFP is relatively bulky. **Temperature adaptability** — NMC performs better in low-temperature discharge; LFP requires heating at low temperatures. Application Notes Containerized and commercial and industrial energy storage is mainly based on LFP; NMC can be evaluated for mobile platforms in severe cold or with weight constraints. Key Points LFP has good thermal stability and 4000–6000 cycles NMC has high energy density but weak thermal stability Commercial and industrial and off-grid applications prefer LFP Consider NMC only in severe cold or weight-constrained cases ### FAQ **Q: What are the key differences between LFP and NMC?** LFP offers good thermal stability, long cycle life and low cost; NMC has high energy density but weaker thermal stability. **Q: Which one should be chosen for commercial & industrial or off-grid microgrids?** LFP is preferred: safe, long-lived and low cost; consider NMC only in severe cold or weight-constrained scenarios. **Q: How much do the two differ in cycle life?** LFP is typically 4000–6000 cycles, while NMC is about 2000–3000 cycles. **Q: How to choose for low-temperature environments?** NMC performs better in low-temperature discharge; LFP requires heating at low temperatures, so evaluate NMC for extreme cold scenarios. # Wenzhou Industrial Park 1.2 MWh user-side energy storage Two charge and two discharge cycles per day, annual electricity cost savings of approximately RMB 620,000, and a 22% reduction in maximum demand. Manufacturing enterprises in the park show a clear peak-valley price spread. After deploying 600 kW/1.2 MWh user-side energy storage, the system performs two charge and two discharge cycles per day, automatically executing peak-valley arbitrage. Operating Results Two charge and discharge cycles per day 22% reduction in maximum demand Annual electricity cost savings of approximately RMB 620,000 The EMS coordinates with the park's existing distribution system to enable capacity expansion without production stoppage. # PCS vs Hybrid Inverter vs Grid-Tied Inverter: What Changes in a Microgrid? Compare the roles of a bidirectional storage PCS, a hybrid inverter and a PV grid-tied inverter before choosing an architecture. These names describe different functions, but manufacturers do not use them consistently. Compare the actual power path and supported operating modes in the product documentation. PCS: battery conversion in both directions A bidirectional power conversion system (PCS) connects a battery DC bus to an AC bus. It can charge the battery from AC and return stored energy to AC within its active-power, apparent-power and DC-current limits. A PCS may be grid-following, grid-forming, or configurable for both; the product specification must say which modes are supported. Hybrid inverter: PV and storage functions in one package A hybrid inverter or hybrid cabinet commonly combines battery conversion with PV MPPT and may include EMS, switchgear, transformer or transfer equipment. The exact boundary varies. Check whether PV inputs and MPPT are actually integrated, how the battery connects, and whether generator and island operation require external devices. Grid-tied PV inverter: PV-to-grid conversion A conventional grid-tied PV inverter converts solar DC into AC synchronized with the utility. Unless specifically designed for storage and islanding, it does not provide bidirectional battery conversion or maintain an independent AC bus when the grid is absent. Questions to settle before selecting Is PV MPPT inside the cabinet or supplied separately? What battery voltage, current and charge/discharge power are supported? Can the device form an islanded AC bus, and what transfer gear is required? Are grid charging, export, generator synchronization and black start supported by this exact configuration? What are the active-power, apparent-power, overload and parallel limits? For example, VGRID’s LEONA-B750K is a split-type, grid-forming hybrid inverter system in the 750 kW class. It integrates PCS, EMS, an isolation transformer and automatic grid/off-grid switching; PV MPPT controllers are separate units. The brochure lists 750 kVA rated off-grid apparent output, 825 kVA maximum output and transfer under 20 ms. Confirm the active-power nameplate and offered transfer configuration. The SP250HAG2T integrates PV MPPT and transfer equipment. Compare the interfaces in the [LEONA-B750K](/en/product/sp750h54pstd-2) and [SP250HAG2T](/en/product/sp250hag2t) pages. ### FAQ **Q: What does a PCS do?** A PCS converts power between a battery DC bus and an AC system. A bidirectional model can charge the battery from AC and discharge it to AC, subject to the product rating and control configuration. **Q: Does every PCS include PV MPPT?** No. Some hybrid cabinets integrate MPPT; many PCS products handle battery conversion and require separate PV inverters or DC/DC MPPT equipment. **Q: Does choosing a PCS guarantee off-grid operation?** No. Island operation depends on grid-forming capability, transfer equipment, protection, battery limits and commissioning settings for the exact model. # Maldives Resort Island 1.1 MWp Solar-Storage Microgrid Renewable energy share raised to 68%, diesel consumption down 64%. The resort island's electrical load varies widely between day and night, and the existing diesel generation was costly to run. The project deployed 1.1 MWp of PV and 2.5 MWh of energy storage, together with hybrid inverters and an EMS. Results Renewable energy share reached 68% Diesel consumption down 64% Payback period of about 4.5 years # A First Look at the Booth for SNEC 2026, the 19th World Solar & Energy Storage Expo Booth Layout - SNEC SMART E 2026 19th Solar & Energy Storage Expo.pdf Click the link above to download the company's strategic development plan. Zhongteng Microgrid (Shenzhen) Technology Co., Ltd. changed its name to Shenzhen Zhongteng Shuneng Technology Co., Ltd. on 2026-05-21, focusing on microgrid solutions and the R&D, production, sales and service of core equipment PCS and related equipment. Going forward, it will serve customers under the brand name "Zhongteng Shuneng VGRID". [Booth Layout - SNEC SMART E 2026 19th Solar & Energy Storage Expo.pdf Click the link above to download](/uploads/2026/09/news-2026snec-vgrid-file-1.pdf)[Company strategic development plan. Zhongteng Microgrid (Shenzhen) Technology Co., Ltd. changed its name to Shenzhen Zhongteng Shuneng Technology Co., Ltd. on 2026-05-21, focusing on microgrid solutions and the R&D, production, sales and service of core equipment PCS and related equipment Going forward, it will serve customers under the brand name "Zhongteng Shuneng VGRID"](/uploads/2026/09/news-2026snec-vgrid-file-1.pdf) # Zhongteng Microgrid (Shenzhen) Technology Co., Ltd. has officially changed its name to "Shenzhen VGRID POWER Technology Co., Ltd." In response to the company's strategic development needs and to further enhance its brand image and core competitiveness, "Zhongteng Microgrid (Shenzhen) Technology Co., Ltd." was approved by the administrative department for industry and commerce and officially changed its name to "Shenzhen VGRID POWER Technology Co., Ltd." on 2026-05-21. The "VGRID POWER" brand positioning: focused on microgrid solutions and the R&D, production, sales and service of core equipment such as PCS. This name change is an important milestone in the company's development history, In response to the company's strategic development needs and to further enhance its brand image and core competitiveness, "Zhongteng Microgrid (Shenzhen) Technology Co., Ltd." was approved by the administrative department for industry and commerce and officially changed its name to "Shenzhen VGRID POWER Technology Co., Ltd." on 2026-05-21. The "VGRID POWER" brand positioning: focused on microgrid solutions and the R&D, production, sales and service of core equipment such as PCS. This name change is an important milestone in the company's development history, marking its entry into a new stage of development. All of the company's legal entity qualifications and existing creditor's rights and debt relationships remain unchanged and are lawfully succeeded by the renamed "Shenzhen VGRID POWER Technology Co., Ltd." All contracts, orders and account reconciliations previously signed under the name "Zhongteng Microgrid (Shenzhen) Technology Co., Ltd." remain fully valid, and no contracts need to be re-signed, ensuring the continuity and stability of business cooperation. Starting from 2026-05-23, the company will fully adopt its new corporate name for external business activities. This name change not only gives the company's name a new contemporary meaning, but also reflects the company's firm determination to deepen its presence in the industry and pursue innovative development. We thank our customers, partners and all sectors of society for their long-term support and trust. In the future, "Shenzhen VGRID POWER Technology Co., Ltd." will continue to uphold a professional and high-quality service philosophy, working hand in hand with colleagues from all walks of life to create a brilliant future together! Hereby notified. With best regards! **Shenzhen VGRID POWER Technology Co., Ltd.** **2026-05-22** # Southeast Asia Hydropower Station Weak Grid VSG Energy Storage Support A 3 MW virtual synchronous machine provides inertia for the weak grid, reducing frequency deviation by 41%. The regional grid is dominated by hydropower and relies on diesel backup during the dry season, resulting in pronounced frequency fluctuations. The project deployed 3 MW of grid-forming energy storage using virtual synchronous machine (VSG) control. Results Provides inertia and voltage support for the weak grid Frequency deviation reduced by 41% Diesel generator start/stop cycles reduced by 70% # SNEC 2026 Shanghai International Photovoltaic Exhibition | VGRID POWER Cordially Invites You to Visit Hall 5.1H, Booth D150 SNEC 2026 Shanghai International Photovoltaic Exhibition | VGRID POWER Cordially Invites You to Visit Dear Industry Partners, New and Existing Customers: The 19th (2026) International Solar Photovoltaic and Smart Energy & Energy Storage and Battery Technology and Equipment (Shanghai) Conference and Exhibition is about to grandly open! Shenzhen VGRID POWER Technology Co., Ltd. will be exhibiting, and we sincerely invite you to visit our booth to exchange ideas, discuss cooperation, explore cutting-edge photovoltaic and energy storage technologies, and jointly expand green **SNEC 2026 Shanghai International Photovoltaic Exhibition | VGRID POWER Cordially Invites You to Visit ** Dear Industry Partners, New and Existing Customers: The 19th (2026) International Solar Photovoltaic and Smart Energy & Energy Storage and Battery Technology and Equipment (Shanghai) Conference and Exhibition is about to grandly open! Shenzhen VGRID POWER Technology Co., Ltd. will be exhibiting, and we sincerely invite you to visit our booth to exchange ideas, discuss cooperation, explore cutting-edge photovoltaic and energy storage technologies, and jointly open up a new future for the green energy market. Exhibition Information **Exhibition Dates**: June 3 - 5, 2026 **Exhibition Venue**: National Exhibition and Convention Center (Shanghai) **Booth Information**: Hall 5.1H, Booth D150 # Guizhou Coal Mine 2.5 MW Energy Storage Project: 20 VGRID POWER SP125HCPS Units in Parallel, Strengthening the Mine Area's Power Safety Line At a coal mine plant area in Jinsha County, Bijie, Guizhou, a 2.5 MW energy storage system composed of 20 VGRID POWER SP125HCPS microgrid energy storage converters has been put into stable operation. Centered on multi-unit parallel technology, the project provides efficient and reliable power support for the mine area, making it a benchmark case for energy storage applications in industrial and mining scenarios. 1. Robust Configuration: 20 Units of 125 kW in Parallel, Building a 2.5 MW Large-Capacity System. The project adopts 2 At a coal mine plant area in Jinsha County, Bijie, Guizhou, a 2.5 MW energy storage system composed of **20 VGRID POWER SP125HCPS microgrid [energy storage converters](https://vgridpower.com/PowerConversionSyste/)** has been put into stable operation. The project is centered on multi-unit parallel technology, providing efficient and reliable power support for the mine area and making it a benchmark case for energy storage applications in industrial and mining scenarios. 1. Robust Configuration: 20 Units of 125 kW in Parallel, Building a 2.5 MW Large-Capacity System The project adopts 20 VGRID POWER SP125HCPS [energy storage converters](https://vgridpower.com/PowerConversionSyste/), each with a rated power of 125 kW, for a total installed capacity of 2.5 MW. Based on mature multi-unit parallel technology, the system enables multiple units to operate in synchronous coordination, with precise current sharing and excellent circulating current suppression, perfectly matching the mine area's high-power, high-impact power demand. 2. Operating Condition Adaptation: Reliable Assurance Tailored for Coal Mine Scenarios Coal mine plant areas impose stringent requirements on the stability and safety of power systems, and the SP125HCPS series was optimized specifically from the outset of its design: **High Overload and Unbalance Tolerance**: supports 125% long-term overload and 135% short-term overload, and can withstand 100% three-phase unbalance conditions, adapting to the complex load characteristics of the mine area; **Wide Voltage Adaptation**: supports a battery voltage range of 680 V-950 V, and can accommodate second-life batteries or dedicated energy storage batteries, improving resource utilization; **High Environmental Adaptability**: IP20 protection rating (IP5X for the core control section) + intelligent air cooling, adapting to the mine area's dusty environment and large temperature differences; 3. Value Delivery: Injecting a "Stable Core" into the Mine Area's Power Safety After the project is put into operation, it will bring multiple benefits to the mine area: **Peak Shaving and Valley Filling, Reducing Electricity Costs**: optimizes power usage by leveraging peak-valley electricity price differences, reducing basic electricity fee expenditures; **Emergency Backup Power, Ensuring Production Safety**: provides rapid power supply when the mains is interrupted, ensuring continuous operation of key equipment such as ventilation and drainage; **Grid Support, Improving Power Supply Quality**: actively participates in voltage and frequency regulation, suppressing power quality issues caused by load fluctuations. The VGRID POWER SP125HCPS series microgrid [energy storage converters](https://vgridpower.com/PowerConversionSyste/), with their modular design, high reliability, and excellent parallel capability, provide efficient energy storage solutions for small and medium-sized commercial and industrial, and industrial and mining scenarios. The successful implementation of this Guizhou coal mine project once again verifies the product's stability and adaptability under complex operating conditions, providing a replicable benchmark solution for the power safety upgrades of more industrial and mining enterprises. # Relocation to Guangming, Gathering Strength for a New Voyage | VGRID POWER Sets Out on a New Journey of Development Dear Partners, Old and New Friends: Moving forward without pause, pursuing the light! Driven by rapid business expansion and strategic upgrading needs, Zhongteng Microgrid (Shenzhen) Technology Co., Ltd. officially relocated from Xixiang, Shenzhen to Guangming District, Shenzhen on 2026-02-24, successfully completing the comprehensive upgrade of its production and office base! This relocation marks an important milestone in the company's development and a new starting point for deepening its work in the new energy microgrid sector. From the former 50 Dear Partners, Old and New Friends: Moving forward without pause, pursuing the light! Driven by rapid business expansion and strategic upgrading needs, **Zhongteng Microgrid (Shenzhen) Technology Co., Ltd.** officially relocated from Xixiang, Shenzhen to Guangming District, Shenzhen on **2026-02-24**, successfully completing the comprehensive upgrade of its production and office base! This relocation marks an important milestone in the company's development and a new starting point for deepening its work in the new energy microgrid sector. From the former 500 m²** R&D and office space to the current** 3,000 m² modern industrial site, this expansion of space is not only a leap in scale but also a testament to our strength — the new office environment integrates R&D innovation, production testing and business collaboration, with a scientific layout and complete facilities, laying a solid foundation for technology iteration, product development and efficient office work, and empowering the company's high-quality development. When drinking water, remember its source, and be grateful to those who walk with us! Every step of growth would not have been possible without the trust and strong support of our partners; every breakthrough stems from the joint efforts and company of our industry partners. Here, Zhongteng Microgrid extends its most sincere gratitude to all old and new friends! What changes is the office address; what remains unchanged is our original aspiration and mission. In the future, Zhongteng Microgrid will continue to uphold its corporate mission of "bringing clean energy to every corner of the world", take the new environment as a new starting point, take innovative technology as the core driving force, and deepen its work in microgrid solutions and core equipment such as [power conversion systems](https://vgridpower.com/PowerConversionSyste/) (PCS) and energy management systems (EMS), continuously providing global customers with high-quality new energy microgrid solutions and moving forward side by side with partners from all sectors to create new brilliance in the clean energy industry! New address: Room 1001, Building 3, Huidongsheng Industrial Park, No. 1028 Guangqiao Avenue, Yulü Community, Yutang Street, Guangming District, Shenzhen We welcome old and new friends to visit and offer guidance! Zhongteng Microgrid (Shenzhen) Technology Co., Ltd. Shenzhen Zhongteng Shuneng Technology Co., Ltd. 2026-02-24 # VGRID POWER Shenzhen cordially invites you to attend SNEC 2025 International Solar Photovoltaic Exhibition and unlock the hard power of microgrid energy storage Dear industry colleagues and partners: VGRID POWER sincerely invites you to visit our booth at the SNEC PV+ 18th (2025) International Solar Photovoltaic and Smart Energy Conference and Exhibition (2025-06-01 to 2025-06-03). As an integrated supplier of R&D, production and sales in the field of PCS, the core equipment for microgrid energy storage, we will present leading diesel-PV-storage hybrid microgrid technology and global project practices, and look forward to exploring the future of energy with you Dear industry colleagues and partners: VGRID POWER sincerely invites you to visit our booth at the **SNEC PV+ 18th (2025) International Solar Photovoltaic and Smart Energy Conference and Exhibition** (2025-06-01 to 2025-06-03). As an integrated supplier of R&D, production and sales in the field of PCS, the core equipment for microgrid energy storage, we will present leading diesel-PV-storage hybrid microgrid technology and global project practices, and look forward to exploring the future of energy with you. **Hall: 6.1H Booth: A320 Date: 2025-06-11 to 2025-06-13** Core Exhibition Highlights **Full-stack technology matrix** **In-house core equipment**: high-performance PCS ([Power Conversion System](https://vgridpower.com/PowerConversionSyste/)), MPPT controller, STS static transfer switch; **Flexible solution coverage**: customized microgrid solutions from 15 kW to 2 MW class, meeting diversified power demand. **20 years of solid technical accumulation** Inheriting the **core team DNA of Emerson**, with more than 20 years of deep engagement in power electronics and **10 years of project experience in complex overseas scenarios**, with technology adapted to extreme environments and stringent standards. **Validated across multiple global scenarios** Products have been successfully applied in **Africa, Southeast Asia, the Middle East, Australia and Europe** and other regions, providing highly reliable energy support for island off-grid, oilfield operations, villa energy storage, mobile emergency power supply and other scenarios. # VGRID POWER Shenzhen SP30H Series Hybrid Inverters Make a Strong Entry into the Australian Market! Awarded 2025 Australian Grid-Connection Certification VGRID POWER (Shenzhen) Technology Co., Ltd. announced today that its flagship product, the SP30H series hybrid converter/inverter, independently developed by the company, officially obtained Australia's stringent grid-connection certification on 2025-04-15. This important milestone marks that the SP30H series fully meets the high standards of Australia's complex grid in terms of performance, safety and compliance, paving the way for entry into the vast Australian residential and commercial & industrial energy storage market. Core **VGRID POWER (Shenzhen) Technology Co., Ltd.** announced today that its flagship product, the **SP30H series hybrid converter/inverter**, independently developed by the company, **officially obtained Australia's stringent grid-connection certification on 2025-04-15**. This important milestone marks that the SP30H series fully meets the high standards of Australia's complex grid in terms of performance, safety and compliance, paving the way for entry into the vast Australian residential and commercial & industrial energy storage market. Core Technology Combined with Authoritative Certification: A Global Energy Market Passport Upgraded The SP30H series is a core flagship product of VGRID POWER for global microgrid and hybrid energy systems. The successful acquisition of **Australian grid-connection certification** is another strong endorsement of its outstanding technical strength. Prior to this, the SP30H series had already obtained a number of mainstream international certifications, including: **European EN 50549-1 certification:** Ensures compliance with the stringent safety and electromagnetic compatibility requirements for grid-connected power generating units in the European market. **South African certification:** Suitable for South Africa's unique grid environment and regulatory standards. **Polish certification:** Successfully entered an important Eastern European market. **“The SP30H series has obtained key certifications from multiple countries in a short period, especially the approval of this Australian certification, which fully validates its outstanding global adaptability and technical leadership.”** said the head of R&D at VGRID POWER.**“This is not merely a breakthrough in product certification, but a firm practice of VGRID POWER's 'globalization, high standards' strategy. We will provide global customers with top-tier hybrid energy solutions that comply with local regulations and are safe and reliable.”** Deep Heritage Rooted in Emerson DNA: How Does the SP30H Shine Globally? The success of the SP30H series is no accident; it is backed by VGRID POWER's strong technical DNA: **Core team advantage:** Inherited from **Emerson's core power electronics team**, with **more than 20 years of deep technical accumulation** and a mature R&D system. **Backed by field experience:** The team has **more than 10 years of extensive experience in overseas microgrid projects in complex scenarios**, with a deep understanding of grid characteristics and user needs in different regions (including Africa, Southeast Asia, the Middle East, Australia, Europe, etc.). **All-round performance:** As an efficient “energy router,” the SP30H perfectly integrates PCS ([Power Conversion System](https://vgridpower.com/PowerConversionSyste/)) and MPPT controller functions, supporting **efficient integration, intelligent management and seamless switching (with built-in STS logic)** for multiple energy sources such as PV, diesel generators and energy storage batteries, making it the **core brain and power source** for realizing “PV-diesel-storage” hybrid microgrids. Empowering Full-Scenario Applications, from Residential to Industrial, from Off-Grid Areas to Mobile Stations With its outstanding flexibility, high reliability and safety certified in multiple countries, the SP30H series hybrid inverter/converter can be widely used in: **Residential and villa energy storage:** Provides economical and efficient green energy security with flexible off-grid/grid-connected switching. **Island off-grid microgrids:** Solves power supply challenges in areas without electricity or with weak grids, enabling energy self-sufficiency. **Industrial scenarios such as oilfields and mines:** Provides stable and reliable backup power and energy-saving and emission-reduction solutions. **Mobile energy storage power supplies:** Provides highly integrated mobile energy solutions for emergency power supply, special operations and more. **Commercial & industrial energy storage:** Helps enterprises shave peaks and fill valleys, reduce electricity costs and improve energy resilience. Combined with the company's **15 kW-2 MW full-power-range microgrid solution capability**, VGRID POWER can provide partners with core solution capabilities and reliable, cost-effective products, helping customers expand into overseas markets. Outlook: Accelerating Globalization, Leading the Future of Smart Energy Obtaining Australian certification is a key step in the SP30H series' global journey and reflects VGRID POWER's determination to continue deepening its presence in international markets. The company will continue to increase R&D investment, expand its global certification footprint and deepen localized services, serving the booming global smart energy market with a product portfolio featuring leading technology, excellent quality and comprehensive certifications, so that stable, efficient and green electricity is available everywhere. # 2025 Spring Festival Holiday Notice Dear Partners: At the start of the new spring, all things renew! All employees of VGRID POWER would like to express our deep gratitude for your long-term support of our company. In the new year, we will work even harder to provide you with better service! Our Spring Festival holiday is from January 19 to February 4, 2025. During the holiday, if you encounter equipment issues, our technical staff will provide timely handling and support remotely to ensure the normal operation of your equipment and minimize the impact. Dear Partners: At the start of the new spring, all things renew! All employees of VGRID POWER would like to express our deep gratitude for your long-term support of our company. In the new year, we will work even harder to provide you with better service! Our Spring Festival holiday is from January 19 to February 4, 2025. During the holiday, if you encounter equipment issues, our technical staff will provide timely handling and support remotely to ensure the normal operation of your equipment and minimize the impact. We wish all our partners good fortune in the Year of the Snake, prosperous business, and all the best for happiness and well-being in the new year! VGRID POWER (Shenzhen) Technology Co., Ltd. 2025-1-17 # VGRID POWER (Shenzhen) obtained ISO 9001/ISO 14001 quality system certification after commencing independent operations SINOSOAR VGRID POWER VGRID POWER (Shenzhen) Technology Co., Ltd. is a high-tech enterprise specializing in the R&D, manufacturing, sales and service of PCS modules for energy storage systems and PV-storage all-in-one cabinets. To strengthen customer confidence, the company carried out ISO quality system certification following the start of its independent operations and successfully passed ISO 9001/ISO 14001 quality system certification. The company will continue to take the customer as the center and professional technology as the core, providing SINOSOAR VGRID POWER VGRID POWER (Shenzhen) Technology Co., Ltd. is a high-tech enterprise specializing in the R&D, manufacturing, sales and service of PCS modules for energy storage systems and PV-storage all-in-one cabinets. To strengthen customer confidence, the company carried out ISO quality system certification following the start of its independent operations and successfully passed ISO 9001/ISO 14001 quality system certification. The company will continue to take the customer as the center and professional technology as the core, providing trustworthy products and services to partners. The company will continue to be guided by market demand and continuously expand product certifications for its partners. # Qinghai Oilfield DC Bus Energy Storage Project Delivered Qinghai Oilfield DC Bus Energy Storage Project Delivered Recently, VGRID POWER (Shenzhen) and a Shandong-based customer jointly delivered a PV-storage-charging project to PetroChina Qinghai Oilfield. The project adopts a DC bus architecture and uses two types of batteries for energy storage: lithium iron phosphate (LFP) and flow batteries. It employs 60 kW each of PV modules from Huasun, LONGi, and JinkoSolar, plus VGRID POWER's self-developed 60 kW MPPT modules, 215 kWh of LFP batteries, 100 kWh of flow batteries, and VGRID POWER's self-developed 100 kW Qinghai Oilfield DC Bus Energy Storage Project Delivered Recently, VGRID POWER (Shenzhen) and a customer from Shandong jointly delivered a PV-storage-charging project to PetroChina Qinghai Oilfield. The project adopts a DC bus architecture, using two types of batteries for energy storage: lithium iron phosphate (LFP) and flow batteries. It uses 60 kW each of PV modules from Huasun, LONGi and JinkoSolar, plus VGRID POWER's self-developed 60 kW MPPT modules; 215 kWh of LFP batteries and 100 kWh of flow batteries work with VGRID POWER's self-developed 100 kW DCDC modules to stabilize the DC bus. Priority is given to PV-generated power, followed by flow battery power, and finally LFP battery power. EMS Interface On-site Installation LFP Energy Storage Cabinet MPPT and DCDC Distribution Cabinet **0****1****30 kW Hybrid Inverter** The 30 kW PV-storage all-in-one unit is a highly efficient, highly reliable energy storage inverter developed for small and medium-sized energy storage microgrids. It features isolated air ducts, an on/off-grid transfer device, support for multiple units operating in parallel off-grid, support for hybrid operation with diesel generators, support for on/off-grid transfer modes, and support for two PV MPPT module inputs. It includes PCS, STS, MPPT and anti-reverse-flow CT, and supports host computer communication. Virtual synchronous generator (VSG), 150% overload capability, seamless transfer, diesel hybrid mode, three-phase independent grid-connected control technology, three-phase independent grid-connected control technology. Application Scenario 1: Oilfield wind-PV-diesel-storage projects, 30 kW/100 kWh to 150 kWh projects, using a 30 kW PV-storage all-in-one unit plus wind turbines connected to the DC bus, using 280 cells configured for 100 kWh to 150 kWh, for optimal cost; oil pumping units are connected directly from the load side. Application Scenario 2: **0****2****100 kW Series Air-Cooled and Liquid-Cooled Converters** The [energy storage converter](https://vgridpower.com/PowerConversionSyste/) independently developed by VGRID POWER is a bidirectional on/off-grid converter designed specifically for microgrids. The equipment connects the energy storage system to the AC grid and can be dispatched by the energy management system or perform bidirectional power conversion according to configured parameters. The SP100H can operate grid-connected on the AC side and can also run independently off-grid. Its specially designed grid-connected mode enables parallel operation with diesel generators. The most distinctive advantage of the SP100H is its broad support for operation in both grid-connected and off-grid modes. With a high protection rating, a wide temperature range and strong overload capability, it provides the reliable protection that microgrid systems require. The intelligent load management and energy management capabilities of the SP100H keep the system running normally even in critical moments. VGRID POWER (Shenzhen) Technology Co., Ltd. is a high-tech enterprise specializing in the R&D, manufacturing, sales and service of energy storage system PCS modules and PV-storage all-in-one units. The company is located in Bao'an District, Shenzhen. Its core team originates from Emerson and comprises experienced, professional and efficient members. The company focuses on the R&D and manufacturing of [energy storage converter](https://vgridpower.com/PowerConversionSyste/) PCS modules and PV-storage all-in-one units, providing customers with standard products and PCS system solutions. The company is committed to a customer-centric approach, with professionalism and service at its core, delivering products and services that customers can trust. Technology Is the Primary Productive Force **01** **Technology R&D** The technical team of VGRID POWER (Shenzhen) has many years of [energy storage converter](https://vgridpower.com/PowerConversionSyste/) R&D experience. Originating from core R&D members of Emerson, the team adheres to the IPD R&D management process, focuses on microgrid scenarios, and builds products with the best performance and the highest degree of standardization and modularization. With a deep understanding of microgrid scenarios, it provides full-chain "turnkey" overall solutions. **02** **Product Certifications** The energy storage converters developed by VGRID POWER (Shenzhen) have passed certifications including 62116, 61727, 62477, 62109, g99, 61000-6, EN50549, CE and CQC. The company currently holds 15 utility model patents, 5 invention patents and 3 design patents. **03** **Global Reach** VGRID POWER (Shenzhen) supplies energy storage converters to VGRID POWER (Beijing). They have been deployed worldwide, with a business footprint covering Southeast Asia, Central Asia, Europe, the Pacific region, Central and South America, and Africa. Quality Assurance ******Strict Testing Standards**Product development follows the IPD R&D process and strict quality testing standards. Performance, vibration, salt spray, durability and limit tests safeguard quality.