🔋 C&I Liquid-Cooled PowerStack

Sungrow

Sungrow ST255CS-2H

Name: Sungrow ST255CS-2H
Brand: Sungrow
Availability: InStock

257 kWh / 125 kW Outdoor C&I BESS

All-in-one outdoor liquid-cooled BESS combining a 257 kWh LFP battery with a 125 kW grid-tie inverter in a single IP55 cabinet. AI-driven thermal management keeps cell temperature delta below 2.5 °C, while integrated multi-stage fire suppression (gas + smoke + heat + aerosol) delivers the highest safety standard for commercial and industrial energy storage.

257 kWh

Nominal Energy

6,000+

Cycle Life

IP55

Protection

Request a Quote → Download Datasheet

Key Features

Why Engineers Choose the ST255CS-2H

Four datasheet-backed advantages for commercial & industrial powerstack deployments.

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LiFePO4 (LFP) 3.2 V / 314 Ah cells Chemistry

Lithium iron phosphate cells deliver superior thermal stability, long cycle life and intrinsic safety versus NMC alternatives. 6,000+ @ 25 °C, 70% SOH retention.

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Intelligent Liquid Cooling

Intelligent liquid cooling (≤2.5 °C cell delta) maintains cell temperature delta below 2.5 °C across the full pack, extending cycle life and enabling consistent performance from −30 °C to +50 °C.

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Multi-Stage Fire Suppression

Layered detection — combustible gas, smoke, heat — triggers hot aerosol suppression at the cell level. Highest single-unit safety standard for C&I BESS deployment.

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Integrated 125 kW PCS

On-board grid-tie inverter delivers 125 kW AC output (on-grid and off-grid), eliminating external PCS, switchgear and cabling — full plug-and-play C&I solution.

Specifications

Complete Technical Datasheet

All parameters sourced from Sungrow's official ST255CS-2H datasheet.

Cell Chemistry	LiFePO4 (LFP) 3.2 V / 314 Ah cells
Nominal Energy	257 kWh
Usable Energy	257 kWh (configurable cycling depth)
Battery Voltage Range	DC 691.2–934.4 V · 256S1P configuration
Nominal Charge / Discharge Current	[DATA REQUIRED]
Max. Current	[DATA REQUIRED]
Cycle Life	6,000+ @ 25 °C, 70% SOH retention
AC Output Power (On-Grid / Off-Grid)	125 kW on-grid · 125 kW off-grid
AC Voltage	400 V 3P4L (range 340–440 V) · 50/60 Hz
Noise Emission	≤65 dB @ 1 m
Max. Operating Altitude	Up to 3,000 m
Fire Suppression	Combustible gas + smoke + heat + hot aerosol suppression
Compatible Inverters	Integrated 125 kW PCS (no external inverter)
Max. Parallel	25 units on-grid · 10 units off-grid
Protection Rating	IP55 · C4 (C5 optional)
Mounting Method	Outdoor cabinet, floor pad
Installation Location	Outdoor
Operating Temp (Charge)	−30 °C to +50 °C (derating above 45 °C)
Operating Temp (Discharge)	−30 °C to +50 °C
Cooling Method	Intelligent liquid cooling (≤2.5 °C cell delta)
Weight	≤3,200 kg
Dimensions (W × H × D)	1150 × 2450 × 1610 mm
Communication	Ethernet / Modbus TCP · iSolarCloud
Certifications	IEC 62619 · IEC 63056 · IEC 62040 · IEC 62477 · IEC 61000 · IEC 62933 · UN 38.3
Warranty	10-year extended warranty available

Applications

Where the ST255CS-2H Fits Best

Optimized for commercial & industrial powerstack deployments.

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Industrial Peak Shaving

Factories and logistics hubs reducing demand charges via load-following discharge during peak tariff periods.

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Commercial Self-Consumption

Shopping centres, office complexes and data centres maximizing on-site PV consumption with intelligent dispatch.

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Solar + Storage Plants

Utility-scale hybrid plants — parallel up to 25 units on-grid (6.4 MWh) for grid-services and arbitrage.

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Critical Backup

Hospitals, telecom hubs and 24/7 facilities requiring grid-independent operation with multi-stage fire safety.

FAQ

What Engineers Ask About the ST255CS-2H

Datasheet-driven answers for procurement teams and BESS designers.

What is the nominal capacity of the Sungrow ST255CS-2H?

The ST255CS-2H has a nominal energy capacity of 257 kWh per unit, with up to 25 units on-grid · 10 units off-grid configurations available for larger systems.

What is the cycle life of the ST255CS-2H?

The ST255CS-2H uses LiFePO4 (LFP) chemistry rated at 6,000+ @ 25 °C, 70% SOH retention. This represents 20+ years of daily-cycle operation under typical residential and commercial dispatch patterns.

Does the ST255CS-2H include an inverter, or is one required separately?

The ST255CS-2H is an all-in-one PowerStack with an integrated 125 kW PCS. No external inverter is required — the unit delivers AC output directly at 400 V 3P4L, on-grid or off-grid.

What is the warranty on the ST255CS-2H?

Standard warranty is 5 years, with extended warranty programs available up to 10 years. Cycle warranty 6,000+ @ 25 °C, 70% SOH retention ensures meaningful long-term performance commitment.

What certifications does the ST255CS-2H carry?

The ST255CS-2H is certified to IEC 62619 · IEC 63056 · IEC 62040 · IEC 62477 · IEC 61000 · IEC 62933 · UN 38.3. Country-specific certifications (KEMCO, INMETRO, SASO) issued on request.