Description
Product Positioning
The MSP250HCG2 is a 250kW all-in-one hybrid solar storage inverter cabinet that integrates PCS, dual MPPT trackers, EMS, PCM grid-tie/off-grid transfer switch, AC/DC distribution, diesel generator control, and surge protection into a single IP54-rated enclosure. Designed for commercial and industrial (C&I) microgrids, backup power systems, and solar-plus-storage installations in emerging markets, this cabinet delivers grid-tie to off-grid transition in under 10ms (active transfer: 0ms) and charging efficiency exceeding 99.3%.
Per IEC 62933-1 framework for electrical energy storage systems, the MSP250HCG2 addresses the core challenge of reliable power continuity in weak-grid and off-grid environments across Southeast Asia, Africa, the Middle East, and Latin America. Its multi-DC-coupled architecture supports up to 240kWp PV input, 680–900V battery banks, and diesel generator hybridization—all managed by an onboard microgrid EMS with cloud platform connectivity.
Product Overview
Unlike industry peers that require separate PCS, MPPT, EMS, and transfer switch enclosures, the MSP250HCG2 adopts an ALL-IN-ONE design philosophy that reduces deployment time, simplifies field commissioning, and minimizes system footprint. The cabinet supports up to 3 units in parallel for scalable capacity up to 750kW, making it suitable for both single-site installations and modular microgrid expansion.
Key Integrated Components:
- Bidirectional PCS (250kVA grid-tie / 275kVA off-grid peak)
- Dual independent MPPT trackers (120kW each, 600–900V range)
- Microgrid EMS with SOC balancing, peak shaving, self-consumption, and anti-reverse power
- PCM static transfer switch (active: 0ms / passive: <10ms)
- AC and DC distribution units with circuit breakers
- Diesel generator hybridization interface
- 400A bypass function for maintenance continuity
- Surge protection and grounding system
Figure 1: MSP250HCG2 system topology — PV, battery, PCS, diesel generator, and EMS integration
Technical Specifications
| Parameter | MSP250HCG2 Specification |
|---|---|
| Battery (DC) Side | |
| Battery Voltage Range | 680V – 900V (max 950V) |
| Max Battery Current | 200A × 2 channels |
| Charging Efficiency | > 99.3% |
| PV (Solar) Side | |
| PV Power | 120kW × 2 (240kWp total) |
| MPPT Voltage Range | 600V – 900V |
| PV Voltage Range | 200V – 950V |
| Max Input Current | 200A × 2 |
| AC Side — Grid-Tie Mode | |
| Rated Power | 250kVA |
| Rated Current | 362A |
| Grid Voltage | 400V / 230V (3-phase 4-wire) |
| Grid Voltage Tolerance | -20% ~ +15% |
| Grid Frequency | 50Hz (47–52Hz) / 60Hz (57–62Hz) |
| Grid Unbalance Tolerance | 125% |
| Power Factor | -1 ~ 1 (adjustable) |
| AC Side — Off-Grid Mode | |
| Rated Output Power | 250kVA |
| Max Output Power | 275kVA |
| Output Voltage THD | < 2% (resistive load) |
| Load Unbalance | 100% |
| Overload Capacity | 1.1×–1.25× rated for 100s; >1.25× for 300ms |
| System & Environment | |
| Grid-Tie/Off-Grid Transfer | Active: 0ms / Passive: <10ms |
| Parallel Capacity | Up to 3 units (750kW total) |
| Isolation Transformer | None (supports external transformer startup) |
| Bypass | 400A |
| Protection Rating | IP54 |
| Dimensions (W×H×D) | 1350 × 2200 × 850 mm |
| Weight | ≈ 610 kg |
| Operating Temperature | -30°C ~ +60°C (derating above 45°C) |
| Humidity | 10% – 95% (non-condensing) |
| Cooling | Forced air cooling |
| Altitude | Up to 4000m (derating above 2000m) |
Core Advantages
1. Sub-10ms Grid-Tie/Off-Grid Transition
The integrated PCM static transfer switch achieves 0ms active transfer and under 10ms passive transfer between grid-tie and off-grid modes. This ensures uninterrupted power supply for critical loads—manufacturing equipment, data centers, healthcare facilities—during grid outages. According to IEEE 1547-2018, distributed energy resources must cease to energize within 2 seconds of grid disturbance; the MSP250HCG2 exceeds this requirement by two orders of magnitude, enabling seamless islanding.
2. Multi-DC-Coupled Architecture with 99.3%+ Efficiency
The cabinet employs a multi-DC-coupled topology where PV and battery connect to a shared DC bus through independent converters, eliminating the double conversion losses typical of AC-coupled systems. Charging efficiency exceeds 99.3%, and the dual MPPT trackers (120kW each, 600–900V range) maximize solar harvest even under partial shading conditions. Based on IEA 2024 data, DC-coupled solar-plus-storage systems achieve 4–7 percentage points higher round-trip efficiency compared to AC-coupled alternatives.
3. Diesel Generator Hybridization & Grid-Forming Capability
The MSP250HCG2 supports diesel generator hybridization, enabling the energy storage system to smooth generator load profiles, reduce fuel consumption by 20–40%, and extend generator service life. In off-grid mode, the inverter operates as a grid-forming source, providing stable 400V/230V output with <2% THD and 100% unbalanced load tolerance—critical for remote construction sites, mining operations, and oilfield facilities where grid power is unavailable.
4. ALL-IN-ONE Design for Rapid Deployment
All power conversion, distribution, control, and protection components are pre-integrated and pre-tested in a single 1350×2200×850mm cabinet weighing approximately 610kg. This plug-and-play design reduces on-site installation time from weeks to days, minimizes wiring errors, and simplifies maintenance. The IP54 enclosure, -30°C to +60°C operating range, and 4000m altitude capability make it suitable for the harshest environmental conditions across emerging markets.
Figure 2: Grid-tie/off-grid control logic with EMS-managed operating modes
Application Scenarios
Scenario 1: C&I Solar-Plus-Storage Microgrid (Grid-Tie with Backup)
For manufacturing plants, commercial buildings, and industrial parks in regions with unreliable grid power, the MSP250HCG2 operates in grid-tie mode for peak shaving and self-consumption during normal grid conditions, then seamlessly transitions to off-grid mode during outages. The EMS manages SOC balancing, time-of-use arbitrage, and anti-reverse power to maximize electricity cost savings. Typical configuration: 250kW PCS + 500–1000kWh battery + 240kWp PV.
Scenario 2: Off-Grid Diesel Hybrid Power Station
For remote mining sites, oilfield operations, construction camps, and island communities with no grid access, the cabinet operates as a grid-forming inverter paired with diesel generators and PV arrays. The EMS optimizes generator loading, stores excess solar energy in batteries, and provides instant power for surge loads—reducing generator runtime and fuel consumption by up to 40%. Per IRENA 2024, off-grid renewable capacity reached 11.1GW globally, with solar-plus-storage-diesel hybrids being the fastest-growing segment.
Scenario 3: Critical Load Backup & Emergency Power
For hospitals, data centers, water treatment plants, and telecommunications infrastructure requiring uninterrupted power, the MSP250HCG2 provides sub-10ms transition to battery backup during grid failures. The 400A bypass function ensures continuity during equipment maintenance, and the 3-unit parallel capability supports scalable redundancy. The -30°C cold start capability and IP54 dust/water protection ensure reliable operation in extreme environments.
Operating Modes & EMS Functions
The onboard microgrid EMS supports the following operating modes and functions:
- Grid-Tie Mode: Peak shaving, self-consumption optimization, surplus power export to grid, anti-reverse power control
- Off-Grid Mode: Black start capability, V/F control for voltage and frequency regulation, load shedding management
- Economic Mode: Time-of-use charge/discharge scheduling for maximum electricity cost savings
- SOC Balancing: State-of-charge management across parallel battery racks
- Diesel Hybrid: Generator load optimization, fuel savings, extended generator life
- Cloud Platform: Remote monitoring, data logging, OTA firmware upgrades, fault diagnosis
- Multi-Unit Parallel: Up to 3 cabinets in parallel for 750kW scalable capacity
Service & Delivery
ImaxPWR provides end-to-end support from system design and product delivery to installation guidance, commissioning, and after-sales maintenance. Our engineering team offers customized solution design based on site load profiles, solar resource assessments, and battery capacity optimization. All products undergo rigorous factory testing before shipment, including full-power burn-in, high-low temperature cycling, and grid-tie/off-grid transition verification.
Standard Warranty: 2 years (extendable) | Response Time: 24 hours for technical support | Remote Monitoring: Included via cloud platform | Certifications: IEC 62933, IEC 62619, CE compliant
Frequently Asked Questions
Q1: What battery chemistries are compatible with the MSP250HCG2?
A: The cabinet supports lithium-ion battery systems with voltage ranges between 680V and 900V, including LFP (Lithium Iron Phosphate), NMC, and other compatible chemistries. The dual 200A battery channels support parallel battery rack configurations. Battery management system (BMS) communication is handled via CAN or RS485 protocols.
Q2: Can multiple MSP250HCG2 units operate in parallel?
A: Yes, up to 3 units can be paralleled for a total capacity of 750kW. The parallel operation is managed by the EMS, which handles load sharing, SOC balancing, and synchronized grid-tie/off-grid transitions across all units.
Q3: How does the grid-tie to off-grid transition work?
A: The integrated PCM static transfer switch continuously monitors grid voltage and frequency. When grid parameters fall outside acceptable ranges, the active transfer achieves 0ms transition by pre-synchronizing the inverter output. For passive transfer (grid failure detection), the transition time is under 10ms, ensuring critical loads experience no perceptible interruption.
Q4: What is the maximum PV capacity that can be connected?
A: The MSP250HCG2 supports up to 240kWp of PV capacity through two independent MPPT trackers (120kW each). Each tracker operates in the 600–900V range with maximum input current of 200A. The wide MPPT range ensures optimal solar harvest even under varying irradiance and temperature conditions.
Q5: Is the cabinet suitable for outdoor installation?
A: Yes, the IP54 protection rating, -30°C to +60°C operating temperature range, 10–95% humidity tolerance, and 4000m altitude capability make the MSP250HCG2 suitable for outdoor installation in harsh environments. Forced air cooling with front-intake/rear-exhaust airflow ensures efficient thermal management. For extreme dust or coastal environments, additional filtration or corrosion protection options are available.
Related Products
- MSP500HCG2 500kW All-in-One Hybrid Solar Storage Inverter Cabinet — Higher power version, 4-channel MPPT, 480kWp PV, for larger C&I installations
- MSP100HKST / MSP125HKST PCS Energy Storage Inverters — 100kW/125kW bidirectional PCS modules with STS, building blocks for custom storage systems
- BIPV320K6 320kW Wall-Mounted Hybrid MPPT Controller — High-power MPPT charge controller for large-scale solar + storage retrofits
- Common DC Bus Energy Storage: 4 Scenarios & Selection Guide — Technical blog on DC-coupled topology selection
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Reviewed by Ethan Li — Chief Engineer, ImaxPWR Power Co., Ltd.
100+ energy storage projects experience | Specialized in microgrid PCS and hybrid inverter systems
About ImaxPWR
ImaxPWR Power Co., Ltd. is a National High-Tech Enterprise headquartered in Shenzhen, China, specializing in energy storage power conversion systems (PCS), bidirectional DC/DC converters, and all-in-one energy storage solutions. With a strong R&D team and 100+ successful project deployments worldwide, ImaxPWR delivers reliable, efficient, and cost-effective power electronics for C&I energy storage, microgrids, and EV charging infrastructure.
Contact us for a customized solution:
📧 info@imaxpwr.com | 📱 +86-13760212825 (COCO) | 🌐 www.imax-pwr.com
© 2026 ImaxPWR Power Co., Ltd. All rights reserved. | Product specifications subject to change without notice.
