The EGbatt-125kW Power Conversion System (PCS) is an advanced bidirectional energy storage inverter engineered for commercial and industrial applications worldwide. This versatile system seamlessly converts between DC and AC power, supporting both 380V three-phase (international/Asian markets) and 480V three-phase (North American markets) configurations from the same hardware platform.

Designed for grid-tied operation, off-grid microgrids, solar-plus-storage systems, and hybrid diesel-generator applications, the EGbatt-125kW delivers exceptional performance with 98.5% peak efficiency, sub-20ms charge/discharge transitions, and comprehensive power quality management.

System Architecture

Figure 1: Single-Line Electrical Diagram

[Battery Bank (+/-)]
      │
      ▼
[DC Disconnect Switch + Precharge Circuit]
      │
      ▼
[DC Link Capacitor + Voltage/Current Sensors]
      │
      ▼
[3-Level Bidirectional IGBT Inverter Bridge] ◄──► [DSP Controller + Gate Driver]
      │
      ▼
[LCL Output Filter (L1-C-L2)]
      │
      ▼
[AC Contactor / Static Transfer Switch (STS)]
      │
      ├────────────► [Grid Connection: 380V/480V 3-Phase]
      │
      └────────────► [Critical Load Output: 380V/480V 3-Phase]

                Universal Voltage Platform: The same EGbatt-125kW hardware supports both 380V (3P3/3P4W) and 480V (3P3/3P4W) configurations through firmware configuration, making it ideal for global deployments and multi-regional projects.
            

Key Features & Benefits

🔧 Flexible Configuration

Wide DC voltage: 580-950V (3P3), 630-950V (3P4W)
Single model supports both 3-wire & 4-wire
Vertical, horizontal, or side mounting
Compatible with 600+Ah large-format cells
Multi-module parallel expansion
20+ mainstream BMS protocols

⚡ High Efficiency

98.5% peak conversion efficiency
3-level NPC IGBT topology
Transformerless design
<20ms charge/discharge transition
<10ms power response time
Intelligent thermal management

🌐 Advanced Grid Support

4-quadrant P/Q control
Low/High Voltage Ride-Through
Anti-islanding protection
Power factor correction (-1 to +1)
Three-phase unbalance compensation
Active harmonic filtering (THD <3%)

🔋 Multi-Mode Operation

Grid-tied mode
Off-grid/islanded mode
Weak grid support
Diesel generator hybrid
Optional STS for seamless transfer
Black-start capability

🛡️ Comprehensive Protection

DC overvoltage/undervoltage
AC short circuit protection
Overtemperature with derating
Ground fault detection
Hardware interlock circuits
Type 2 SPD integrated

🔌 Smart Integration

Modbus RTU & CAN 2.0
SunSpec-aligned registers
RESTful API available
4 digital inputs / 3 relay outputs
Remote firmware updates
Cloud monitoring ready

Technical Specifications

Parameter	Specification
Model Information
Model Number	EGB-PCS125-L2M-3 (Front Wiring) / EGB-PCS125-L2M-B3 (Rear Wiring)
Product Type	Bidirectional Three-Phase Power Conversion System
Topology	Transformerless 3-Level NPC IGBT
DC Input Parameters
DC Voltage Range	580-950V DC (3-phase 3-wire) 630-950V DC (3-phase 4-wire)
Maximum DC Current	210A
Voltage Regulation Accuracy	≤ ±1%
Current Regulation Accuracy	≤ ±1%
AC Output (Grid-Tied Mode)
Rated AC Power	125kW (continuous)
Nominal Voltage	380V / 400V / 480V AC, 3-phase (configurable)
Voltage Tolerance	-15% to +15% of nominal
Maximum AC Current	190A
Grid Frequency	45-55Hz / 55-65Hz (auto-detection)
Power Factor (Rated)	> 0.99
Power Factor Range	-1.0 (leading) to +1.0 (lagging), adjustable
DC Current Injection	< 0.5% of rated AC current
Current THD	< 3% at rated power
Charge/Discharge Transition	< 20ms
Overload Capability	110% for 10 min / 120% for 1 min
AC Output (Off-Grid Mode)
Off-Grid Voltage	380V / 400V / 480V AC ±15%, 3-phase
Off-Grid Frequency	50Hz / 60Hz (selectable)
Voltage Control Accuracy	< 1%
Voltage Unbalance	< 2%
Output THD (Nonlinear Load)	< 3%
Mechanical & Environmental
Dimensions (W×D×H)	Front: 500×650×200mm (19.7"×25.6"×7.9") Rear: 500×680×200mm (19.7"×26.8"×7.9")
Weight	Front: 50kg (110 lbs) Rear: 53kg (117 lbs)
Protection Rating	IP20 (Indoor / Cabinet-Mounted)
Cooling Method	Intelligent Forced-Air Cooling
Airflow Rate	Front: 720 CFM / Rear: 769 CFM
Noise Level	≤ 65dB at 1 meter
Operating Temperature	-25°C to +60°C (derating above +45°C)
Humidity	0-95% RH, non-condensing
Maximum Altitude	3000m (derating required above)
MTBF	≥ 100,000 hours
Communication & Control
Communication Interfaces	RS485, CAN 2.0
Protocols	Modbus RTU, CAN 2.0, SunSpec-aligned
BMS Integration	20+ mainstream protocols pre-configured
Digital I/O	4 inputs (dry contact) / 3 outputs (relay)

Applications & Use Cases

🏭 Commercial & Industrial (C&I)

Demand charge management, peak shaving, and time-of-use arbitrage for manufacturing facilities, warehouses, and commercial buildings. Reduce electricity costs by 30-50%.

☀️ Solar+Storage Systems

Maximize PV self-consumption, store excess solar generation, and provide backup power. Perfect for rooftop and ground-mount solar installations with battery storage.

🔌 Microgrids & Remote Sites

Islanded operation for remote facilities, campuses, and islands. Hybrid integration with diesel generators for fuel savings and emission reduction.

🚗 EV Charging Stations

Buffer high-power DC fast charging demand, defer grid upgrades, and manage charging load profiles. Support 150-350kW charging infrastructure.

⚡ Grid Support Services

Provide frequency regulation, voltage support, and spinning reserves to utilities. Participate in demand response and ancillary service markets.

🏥 Critical Facilities

Uninterruptible power for data centers, hospitals, and emergency services. Optional STS ensures <20ms seamless transfer during grid outages.

Ready to Deploy?

The EGbatt-125kW is engineered for rapid integration with leading BMS and EMS platforms. Get technical support from our engineering team.

📥 Download Datasheet 💬 Contact Engineering

Technical Details & Compliance

Control Modes

Constant Power Control: Maintain fixed charge/discharge power regardless of voltage fluctuations
DC Constant Current: Battery-friendly charging with precise current regulation
AC Constant Current: Grid current control for power quality management
AC Constant Voltage: Off-grid voltage stabilization for critical loads

Power Quality Management

Three-Phase Unbalance Compensation: Independent per-phase current control to balance uneven loads
Low-Order Harmonic Mitigation: Active filtering reduces current THD to <3%
Reactive Power Support: Dynamic VAr injection for power factor correction and voltage regulation
Neutral Current Reduction: Minimize neutral conductor stress in 4-wire systems

Grid Compliance & Standards

                Design Compliance: The EGbatt-125kW architecture is designed to meet IEEE 1547-2018 functional requirements, NEC Article 706, and IEC 62109 safety standards. UL 1741 SA certification testing in progress. System supports configurable ride-through curves for CA Rule 21, HECO, ERCOT, and other regional grid codes.
            

Derating Guidelines

Condition	Derating Factor
Ambient Temperature >45°C	Linear derating to 80% at 60°C
Altitude >2000m	Linear derating to 80% at 3000m
Grid Voltage ±15%	Full power maintained; linear derating beyond
DC Voltage <650V or >900V	Moderate derating near range limits

Protection Features

DC Side Protection

Reverse polarity protection
Overvoltage/undervoltage
Overcurrent protection
Precharge fault detection
Insulation monitoring (optional)

AC Side Protection

Overvoltage/undervoltage
Overcurrent/short circuit
Overfrequency/underfrequency
Phase loss/sequence error
Type 2 SPD integrated

System Protection

Overtemperature with derating
Fan failure detection
Ground fault detection
Hardware interlock circuits
Anti-islanding protection

Blog

EGbatt-125kW Three-Phase Bidirectional PCS

Product Overview