Description

Sungrow PowerStack ST255CS-2H-US Liquid-Cooled Commercial & Industrial Battery Energy Storage System

The Sungrow PowerStack ST255CS-2H-US is a fully integrated liquid-cooled Battery Energy Storage System (BESS) designed for commercial and industrial (C&I) energy storage applications. Combining a 257kWh lithium iron phosphate (LFP) battery, a 125kW power conversion system (PCS), advanced liquid cooling, and comprehensive fire protection into a compact outdoor enclosure, the PowerStack delivers safe, efficient, and reliable energy storage for peak shaving, backup power, renewable energy integration, and microgrid applications.

Factory pre-installed and pre-commissioned, the ST255CS-2H-US significantly reduces installation time while maximizing system performance, reliability, and operational efficiency.

High-Performance Commercial Energy Storage

The PowerStack is engineered to support demanding commercial and industrial applications.

• 257kWh usable battery capacity
• 125kW AC power output
• Three-phase 480V operation
• Integrated Power Conversion System (PCS)
• Ideal for daily cycling and peak demand management

Advanced Liquid Cooling Technology

Sungrow’s intelligent liquid-cooling system maintains uniform cell temperatures to improve battery performance and extend service life.

Benefits include:

• Intelligent thermal management
• Up to 40% reduction in daily system heat loss
• Cell temperature difference maintained at ≤2.5°C
• Improved battery lifespan
• Enhanced discharge performance and efficiency

Factory-Integrated Turnkey Solution

The ST255CS-2H-US is delivered as a complete, factory-tested system.

Advantages include:

• Pre-installed components
• Factory pre-commissioning
• Reduced on-site labor
• Faster commissioning
• Simplified installation
• Lower overall project costs

Comprehensive Safety Protection

PowerStack incorporates multiple layers of protection to maximize operational safety.

Features include:

• Three-level overcurrent protection for PACK, RACK, and PCS
• Three-level fire prevention system
• Early thermal runaway detection
• Combustible gas detector
• Smoke detector
• Heat detector
• Alarm sounder
• Integrated ventilation system
• Water-based fire suppression system
• Extensive factory testing with more than 500 safety tests from cell to system level

High-Efficiency Power Conversion

Integrated power electronics maximize system performance.

• Up to 98.6% PCS efficiency
• Low harmonic distortion
• Excellent power quality
• Power factor adjustable from 1.0 leading to 1.0 lagging
• Grid-support functionality

Flexible Commercial Installation

Designed specifically for commercial and industrial facilities.

• Seamless side-by-side cabinet installation
• Compact footprint
• Outdoor-rated enclosure
• Suitable for distributed energy storage applications
• Ideal for new and retrofit projects

Intelligent Monitoring & Communications

Integrated monitoring enables efficient operation and maintenance.

• Ethernet communication
• Modbus TCP protocol
• Real-time monitoring
• Remote diagnostics
• Simplified fleet management
• Reduced maintenance requirements

Durable Outdoor Construction

Built to perform reliably in demanding environments.

• NEMA 3R enclosure
• C4-L corrosion protection
• Liquid cooling system
• Operating temperature: -30°C to +50°C
• Maximum operating altitude: 2,000 m (6,562 ft)
• Noise level: ≤65 dB at 1 meter
• 0–100% non-condensing humidity operation

Product Specifications

• Model: ST255CS-2H-US
• Battery Chemistry: Lithium Iron Phosphate (LFP)
• Battery Capacity: 257kWh
• Battery Configuration: 256S1P
• Nominal Battery Voltage: 767V–934.4V
• Nominal AC Power: 125kVA @ 45°C
• Nominal AC Voltage: 480V
• AC Configuration: Three-Phase (3P3W)
• Frequency: 60Hz
• PCS Efficiency: Up to 98.6%
• Protection Rating: NEMA 3R
• Cooling: Intelligent Liquid Cooling
• Communication: Ethernet / Modbus TCP
• Weight: ≤3,000 kg (6,614 lbs.)

Certifications

Designed to meet major North American energy storage standards.

• UL 1741 SB
• IEEE 1547:2018
• UL 1973
• UL 9540
• UL 9540A
• NFPA 855
• NFPA 69
• UN 38.3

Ideal Applications

• Commercial buildings
• Industrial facilities
• Manufacturing plants
• Solar + battery storage systems
• Peak shaving
• Demand charge reduction
• Backup power
• EV charging infrastructure
• Microgrids
• Renewable energy integration

SKU

ST255CS-2H-US

Why Choose the Sungrow PowerStack ST255CS-2H-US?

The Sungrow PowerStack ST255CS-2H-US combines high-performance LFP battery technology, intelligent liquid cooling, integrated power conversion, and advanced safety systems into a compact, factory-assembled commercial energy storage solution. Designed to reduce installation time, lower operating costs, and maximize long-term reliability, it provides an ideal platform for commercial and industrial facilities looking to optimize energy use, improve resilience, and integrate renewable energy.

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