The Static Transfer Switch (STS) Box is a smart, high-capacity switching solution for commercial and industrial energy storage systems. It enables automatic, seamless transitions between grid-tied and off-grid inverter modes during power outages, ensuring uninterrupted supply to critical loads. Supporting up to 138kW (200A) in grid-tied mode, it’s compatible with generators and large appliances like heat pumps and motors—delivering flexible, reliable energy management.
Product Features:
- ET 50kW Compatible: Designed to pair seamlessly with the ET 50kW inverter for UPS-level performance and reliable off-grid switching.
- Generator Integration: Supports control and integration with diesel generators for backup power flexibility.
- Large Load Handling: Enables connection and control of high-demand equipment such as motors and heat pumps.
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Outdoor-Ready: Built with IP65 ingress protection for safe and durable outdoor installation.
Specifications:
Electrical Data
- Nominal Output Voltage: 380 / 400 V, 3L / N / PE
- Output Voltage Range: 176 V ~ 276 V
- Nominal AC Frequency: 50 / 60 Hz
- AC Frequency Range: 45 ~ 65 Hz
Inverter Side
- Nominal Apparent Power: 50,000 VA
- Max. Apparent Power: 50,000 VA
- Nominal Current: 72.5 A
- Max. Current: 75.8 A
Grid Side
- Nominal Apparent Power: 50,000 VA
- Max. Apparent Power: 50,000 VA
- Nominal Current: 72.5 A
- Max. Current: 75.8 A
Back-up Side
- Nominal Apparent Power: 50,000 VA
- Max. Apparent Power without Grid: 55,000 VA
- Max. Apparent Power with Grid: 138,000 VA
- Nominal Current: 72.5 A
- Max. Current: 83.3 A
Generator / PV Inverter Side
- Nominal Apparent Power: 50,000 VA
- Max. Apparent Power: 55,000 VA
- Nominal Current: 72.5 A
- Max. Current: 83.3 A
Other Electrical Data
- AC Side Relay Nominal Current: 200 A
- Generator Side Relay Nominal Current: 90 A
- Switch Time: <10 ms
General Data
- Operating Temperature Range: -35°C ~ +60°C
- Max. Operating Altitude: 4000 m
- Cooling Method: Natural Convection
- Communication with Inverter: RS485
- Weight: 16.5 kg
- Dimensions (W × H × D): 510 × 425 × 156 mm
- Mounting Method: Wall Mounted
- Topology: Non-isolated
- Ingress Protection Rating: IP65
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