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Sungrow Energy Storage (PV-ESS)
125kW/257kWh ST255CS-2H
Cost Efficiency
Integrated pre-installation/pre-commissioning reduces on-site work.
AI-controlled thermal balance cuts daily system heat loss by 33%.
Precise liquid-cooling keeps cell temperature difference ≤2.5°C
High Efficiency & Flexibility
DC/AC power conversion reaches up to 98.5% efficiency.
Seamless cabinet installation (supports side-by-side setup).
Flexible grid connection (on-grid, off-grid, and automatic switching available).
Smart & Robust Operation
Cloud-based monitoring (real-time alarms/troubleshooting via IsolarCloud App/web).
Wireless intelligent O&M (near-field/remote operation; one-key commissioning lowers maintenance costs).
Safety & Reliability
AI-monitored cell health (early warnings for thermal runaway).
Three-level over-current protection (covers PACK, RACK, PCS).
Three-level fire prevention (early thermal runaway alerts to avoid fires).

ST256CS 2H Energy Storage System
DC Side
Cell Type: LFP (3.2V/314Ah)
Configuration: 26S61P
Nominal Capacity: 257 kWh
Voltage Range: 691.2V – 834.4V
Charge/Discharge Depth: 0%–100%
AC Side (On-Grid)
Nominal Power: 125 kW
Voltage: 400V (3P4W; 340V–440V range)
Frequency: 50/60Hz (45–55Hz/55–65Hz range)
Max Current: 351A (nominal power) / 255A (50/60Hz)
THD: ≤3% (nominal) / ≤0.5% (light load)
Power Factor: 1.0 leading–1.0 lagging
AC Side (Off-Grid)
Voltage: 400V
Frequency: 50/60Hz
THD: ≤3% (linear load)
Max Load: 100% rated capacity
System Basics
Dimensions (W×H×D): 1150×2450×1610mm
Weight: ≤3200 kg
Protection: IP55
Anti-Corrosion: C4 (default) / C5 (optional)
Operating Conditions: 0%–100% humidity; -30°C–50°C (derated at 40°C); max 3000m altitude
Cooling: Intelligent liquid cooling (≤65dB @1m)
Extras & Compliance
Fire Safety: Gas/smoke detectors + hot aerosol extinguisher
Communication: Ethernet (Modbus TCP)
Max Parallel: 25 (On-Grid) / 10 (Off-Grid)
Standards: IEC 62619, IEC 63056, etc.
