Description
BAC125K950C
SiC
125kW SiC Bidirectional Energy Storage Converter Module
SiC Technology · Bidirectional AC/DC · V2G / V2L Ready
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✓ IP20
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✓ Hot-Swap
This energy storage converter module utilizes SiC (Silicon Carbide) devices to achieve bidirectional conversion between AC and DC, featuring high efficiency and bidirectional energy flow with automatic switching between charging and discharging[reference:0][reference:1].
It supports grid-connected and off-grid operation as well as module paralleling capabilities. Equipped with RS485, CAN, Ethernet, and dry contact communication interfaces for seamless integration with third-party equipment.
The module is widely applied in peak shaving and valley filling, photovoltaic-storage-direct-flexible integration, and photovoltaic-storage-diesel hybrid systems. The entire power loop features independent anti-interference design, ensuring stable operation in complex industrial electromagnetic environments — making it the premier PCS choice for industrial and commercial energy storage.
⚙️ Core Functions & Product Advantages
Safer & More Reliable
Wide DC voltage range of 600–950Vdc, compatible with various Ah battery systems[reference:2]. DSP+CPLD digital control with multi-level hardware/software overcurrent, overvoltage, and overtemperature protection. Battery cluster management with per-cluster optimization. Full-loop independent anti-interference design for complex electromagnetic environments.
Higher Conversion Efficiency
Third-generation SiC power semiconductors achieve up to 98.8% peak efficiency[reference:3] — 2–3% higher than traditional IGBT solutions. Significantly reduces long-term operational energy costs and shortens project payback periods.
Smart & Integration-Ready
Supports seamless grid-to-off-grid switching with STS module[reference:4]. Compact high-power-density design. Multiple communication interfaces: CAN, RS485, Ethernet, dry contact for seamless integration with EMS, BMS, and remote monitoring platforms.
Flexible Parallel Expansion
Supports multi-module parallel operation with stable current sharing — stack power to build MW-class industrial/commercial storage systems. Hot-swappable maintenance eliminates system downtime for module replacement.
🏭 Typical Applications
Industrial & Commercial Peak Shaving
Peak shaving and valley filling energy storage stations for factories, commercial buildings, and industrial parks.
PV-Storage-Direct-Flexible Integration
DC-coupled systems integrating photovoltaic, storage, and DC flexible power distribution.
PV-Storage-Diesel Off-Grid Microgrid
Standby off-grid microgrid systems for islands, remote villages, and critical facilities.
Large-Scale Integrated Storage Cabinets
All-in-one industrial/commercial storage cabinets with integrated PCS, battery, and EMS.
Distributed PV + Storage
Distributed photovoltaic systems paired with energy storage for self-consumption optimization.
Emergency Uninterruptible Power
Factory emergency backup power and critical load uninterrupted supply during grid outages.
📊 Technical Specifications
| Parameter | Specification |
|---|---|
| 📋 Basic Product Information | |
| Product Name | 125kW Energy Storage Converter Module |
| Product Model | BAC125K950C |
| 🔋 Charging — AC Side | |
| Rated Grid Voltage | 400Vac (380/400/415Vac configurable) |
| Grid Voltage Range | 304Vac – 485Vac |
| Grid Frequency | 50/60 ±5% (auto-adaptive) |
| Voltage System | 3-phase 4-wire or 3-phase 5-wire |
| Input Rated Current | 181A |
| Power Factor | ≥ 0.99 (full load) |
| Current Harmonic | < 3% (full load) |
| 🔋 Charging — Battery DC Side | |
| Output Voltage Range | 600 – 950Vdc |
| Output Max Current | 198A Max |
| Rated Charging Power | 125kW |
| Power Derating | 600Vdc–630Vdc: linear derating; 630Vdc–950Vdc: full output |
| Max Charging Efficiency | 98.8% Max |
| Voltage Regulation Accuracy | ±0.5% |
| Current Regulation Accuracy | ±1% |
| Ripple Coefficient | < 1% Vo |
| 🔋 Discharging — Battery DC Side | |
| Battery Voltage Range | 600 – 950Vdc |
| Max Discharge Current | 198A Max |
| 🔋 Discharging — AC Side (Grid-Tied) | |
| Grid Voltage Range | 304Vac – 485Vac |
| Grid Frequency | 50/60 ±5% |
| Rated Output Power | 125kVA Max |
| Discharge Power Derating | 304Vac–360Vac: linear derating; 360Vac–485Vac: full output |
| Max Discharge Efficiency | 98.5% Max |
| 🛡️ Protection Functions | |
| Full Protection Suite | Over/under voltage, overcurrent, short-circuit, overtemperature, anti-islanding, surge, DC reverse polarity |
| 📋 Environment & Physical | |
| Operating Temperature | -35°C – 60°C (derating above 45°C) |
| Storage Temperature | -40°C – 75°C |
| Noise | < 68dB |
| Dimensions (W×D×H) | 500 × 675 × 200 mm (excluding handles) |
| Weight | 50 kg |
| Ingress Protection | IP20 (single module standard) |
| Cooling | Intelligent speed control, forced independent duct air cooling |
| 🔌 Communication & Standards | |
| Communication Interfaces | RS485, CAN, Ethernet, Dry Contact |
| Chinese National Standards | GB/T34120-2023, GB/T34133-2023 |
| International EMC & Safety | EN 62477, EN IEC 61000 |
⚡ Electrical Topology & Working Mode
BAC125K950C adopts a SiC bidirectional 3-level topology, supporting three operating modes: grid-connected charging, grid-connected discharging, and off-grid standalone V2L. The high and low voltage circuits are isolated with full-link anti-interference treatment for controlled bidirectional energy flow.
⟷
SiC 3-Level PCS
⟷
STS Switch
⟷
Battery 600‑950Vdc
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⚡ Grid-Connected Discharging
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🏝️ Off-Grid V2L Mode
🛡️ Protection & Safety System
BAC125K950C employs a hardware ultra-fast protection circuit + dual-DSP software real-time monitoring dual-protection architecture. Power and communication loops feature independent anti-interference design, with microsecond-level fault shutdown of power devices to comprehensively protect the grid, battery, and equipment.
Hardware-level over/under voltage, overcurrent, short-circuit, DC reverse polarity protection. Instant SiC device shutdown upon fault detection.
Built-in anti-islanding logic. Wide grid voltage/frequency adaptation range ensures stable operation during surges, sags, and short interruptions.
Surge absorption circuits on I/O ports. Built-in bus insulation monitoring with active alarm and shutdown upon insulation anomalies.
Independent duct intelligent speed-control cooling. Automatic linear derating above 45°C. Stable startup down to -35°C for cold-climate applications.
❓ Frequently Asked Questions
🔗 Does the module support multi-module parallel operation? How is current sharing stability?
Yes, hardware natively supports multi-module parallel expansion with built-in high-precision digital current sharing control. Hot-swappable online replacement eliminates system downtime for maintenance.
⚡ What is the core advantage of SiC devices over traditional IGBT?
Third-generation SiC offers ultra-low switching losses with 98.8% peak efficiency — 2–3% higher than IGBT[reference:5]. Higher annual energy yield per storage capacity, smaller cooling load, more compact size, and lower long-term electricity costs — shortening project payback periods.
🔄 Does it support seamless grid-to-off-grid switching? What accessories are needed?
Yes, seamless grid-to-off-grid switching is supported with the STS Static Transfer Switch module[reference:6]. During normal grid operation it runs in peak-shaving mode; upon grid failure it automatically switches to off-grid V2L mode to power critical loads.
📡 What communication protocols are supported? Can it integrate with third-party platforms?
Standard interfaces: RS485, CAN, Ethernet, and dry contact. Supports standard Modbus RTU/TCP and industry-specific protocols for seamless integration with third-party BMS, EMS, and remote monitoring platforms.
🧩 Does the module support custom development? What is the sample policy?
BAC125K950C can be paired with our full range of energy storage equipment to build complete systems: STS Static Transfer Switch, SiC 3-channel MPPT PV boost module, bidirectional high-frequency isolated DC-DC storage module, V2G bidirectional chargers, integrated industrial/commercial storage cabinets, and battery formation/testing power supplies.
🔗 Related Products
125kW Bidirectional AC/DC
SiC-based, up to 99% efficiency[reference:7]
