Product information
Static Transfer Switch (STS) box, STS Series, for ET 25-50kW hybrid inverter backup/off-grid switching
Key features
- Supports control of diesel generator integration
- IP65 ingress protection for outdoor installations
- Paired with ET 25-50kW for UPS-level and off-grid switching
- Supports the connection and control of large loads
- During grid-tied operation, supports a maximum load capacity of 138kW (200A) for the backup interface
Specifications
| Nominal output voltage | 380 / 400, 3L / N / PE |
|---|---|
| Output voltage range | 176 ~ 276 V |
| Nominal AC frequency | 50 / 60 Hz |
| AC frequency range | 45 ~ 65 Hz |
| Inverter side: nominal apparent power | 50000 VA |
| Inverter side: max. apparent power | 50000 VA |
| Inverter side: nominal current | 72.5 A |
| Inverter side: max. current | 75.8 A |
| Grid side: nominal apparent power | 50000 VA |
| Grid side: max. apparent power | 50000 VA |
| Grid side: nominal current | 72.5 A |
| Grid side: max. current | 75.8 A |
| Back-up side: nominal apparent power | 50000 VA |
| Back-up side: max. apparent power without grid | 55000 VA |
| Back-up side: max. apparent power with grid | 138000 VA |
| Back-up side: nominal current | 72.5 A |
| Back-up side: max. current | 83.3 A |
| Generator / PV inverter side: nominal apparent power | 50000 VA |
| Generator / PV inverter side: max. apparent power | 55000 VA |
| Generator / PV inverter side: nominal current | 72.5 A |
| Generator / PV inverter side: max. current | 83.3 A |
| Nominal current of AC side relay | 200 A |
| Nominal current of generator side relay | 90 A |
| Switch time | <10 ms |
| Operating temperature range | -35 ~ +60 °C |
| Max. operating altitude | 4000 m |
| Cooling method | Natural Convection |
| Communication with inverter | RS485 |
| Weight | 16.5 kg |
| Dimension (W × H × D) | 510 × 425 × 156 mm |
| Mounting method | Wall Mounted |
| Topology | Non-isolated |
| Ingress protection rating | IP65 |
| Safety regulation | IEC62109-1 / -2 |
| EMC | EN61000-6-1, EN61000-6-2, EN61000-6-3, EN61000-6-4 |
Warranty
5 years limited warranty (STS listed as accessory product in GoodWe Global Limited Warranty for Inverter System, Rev 5.3 20260917).