| Rated Voltage | 400V |
| Grid/Off-grid Switching Time | <20ms |
| Humidity | 0–95% RH, Non-condensing |
| Cooling Method | Air Cooling |
| Protection Rating | IP55 |
| Operating Altitude | ≤2000 m (Derating Above 2000 m) |
| Grid Type | 3W+N+PE |
The STS250/500/800-C125 High Capacity STS Transfer Cabinet is engineered for battery energy storage systems that demand higher load capacity, faster switching performance, and maximum power reliability. It is designed for commercial and industrial BESS projects, microgrid systems, renewable energy integration, and critical infrastructure applications where uninterrupted power is essential.
This high capacity STS transfer cabinet enables seamless switching between grid power and energy storage systems in less than 20 milliseconds. The ultra-fast transfer protects sensitive loads such as data centers, telecom systems, medical facilities, and advanced manufacturing equipment from power interruptions or voltage fluctuations.
Built with a highly integrated cabinet design, the system combines static transfer switch technology, intelligent metering, dual power input control, communication modules, and expandable load interfaces. The cabinet also supports solar inverter integration and priority load management, allowing continuous power delivery even during grid outages.
Compared with standard STS cabinets, the C125 model is optimized for higher current handling capability and improved switching stability. It provides stronger system redundancy, enhanced electrical protection, and flexible expansion capacity for large-scale battery energy storage and hybrid energy projects.
Millisecond Seamless Power Transfer
Provides grid-to-battery switching in ≤20ms. This seamless power transfer protects sensitive equipment such as data centers, hospitals, and precision manufacturing systems.
Highly Integrated Static Transfer Switch Design
Combines the static transfer switch (STS), UPS interface, smart energy meter, circuit breakers, optional ATS, and communication modules in a compact cabinet. This integrated design simplifies deployment in commercial BESS and microgrid systems.
Redundant Electrical Safety Protection
The STS transfer cabinet uses dual power paths and reinforced protection for critical components. This ensures continuous power delivery during switching or system faults.
Smart Monitoring and Flexible System Integration
Supports 4G communication for real-time monitoring, alarm notifications, and energy data reporting. Reserved solar and load interfaces allow flexible integration with battery energy storage systems and renewable energy projects.
Ensures stable grid-to-storage power switching for factories, logistics centers, and commercial facilities deploying BESS solutions.
Large Commercial & Industrial BESS
Supports high-load switching in manufacturing plants, logistics hubs, and commercial facilities requiring stable and continuous power.
Microgrid and Renewable Energy Systems
Ensures seamless transition between grid, solar generation, and battery storage in hybrid energy microgrids.
Critical Infrastructure Backup Power
Ideal for hospitals, data centers, telecom networks, and public safety facilities where power interruption is unacceptable.
Utility and Grid Support Projects
Enhances system stability in peak shaving, demand response, and grid resilience energy storage projects.
| Energy Storage Cabinet Side Parameters | STS250-C125 | STS500-C125 | STS800-C125 |
|---|---|---|---|
| Maximum Number of Connected Energy Storage Cabinets | 1 | 2 | 4 |
| Maximum Current of Energy Storage Cabinet | 250A | 2*250A | 4*250A |
| Rated Power of Energy Storage Cabinet | 125kW | 2*125kW | 4*125kW |
| Grid Side Parameters | |||
| Number of Grid Connection Points | 1 | ||
| Maximum Grid Connection Current | 500A | 1000A | 1600A |
| Rated Voltage | 400V | ||
| Voltage Range | 400V±15% | ||
| Grid Type | 3W+N+PE | ||
| Grid Frequency | 50/60Hz | ||
| Grid/Off-grid Switching Time | <20ms | ||
| PV Input Requirements | |||
| Maximum PV Port Current | 250A | 500A | 1000A |
| Recommended Maximum PV Inverter Input Power | 100% × Rated Power of Energy Storage Cabinet | ||
| Load Requirements | |||
| Maximum Load Current | 250A | 500A | 1000A |
| Recommended Maximum Load Power* | 70% × Rated Power of Energy Storage Cabinet | ||
| Auxiliary Equipment Parameters | |||
| UPS Specifications | 1kVA | 3kVA | 6kVA |
| Surge Protective Device (SPD) | Level II | ||
| Metering Accuracy | 0.5S | ||
| Automatic Transfer Switch (ATS) | option | ||
| General Parameters | |||
| Dimensions (W × D × H) | 800×1350×2400 mm | 1000×1350×2400 mm | 1200×1350×2400 mm |
| Weight | 500kg | 550kg | 1080kg |
| Altitude | < 2000 m (Derating Above 2000 m) | ||
| Operating Temperature | -15℃~45℃ | ||
| Humidity | 0–95% RH, Non-condensing | ||
| Cooling Method | Air Cooling | ||
| Protection Rating | IP55 | ||
| Communication | Ethernet/RS485 | ||
Our liquid-cooled energy storage cabinet can be customized to meet the real requirements of projects across Europe.
Grid Compliance, Country by Country
Designed to meet local interconnection standards including EN 50160 and VDE-AR-N 4110 / 4120, so your system passes utility requirements without added redesign.
Your Brand, Front and Center
Add your company logo to the cabinet exterior or the HMI interface for a consistent, professional project look on site.
Ready for Harsh Environments
Rated IP55 or IP65. Operates from –20°C to +55°C. Optional anti-corrosion coating available for coastal or high-humidity locations.
Plug-and-Play Integration
Supports open protocols like Modbus, CAN, and IEC 61850. Easy to connect with PV systems, generators, or existing energy management systems.
Built around your brand and your site requirements. Fast to deploy. Easy to run.
