EnjoyPowers SinE-STS static transfer switch
| Device Type | Modbus TCP (Ethernet) | RS485 | Curtailment |
|---|---|---|---|
| SinE-STS static transfer switch | ❌ | ✅ | ❌ |
The SinE-STS is the static transfer switch of an EnjoyPowers PCS+STS system. It switches the installation between the grid and a diesel generator, and it measures the connection point it switches. The Sofar EMS reads it as an energy meter: line and phase voltages, phase currents, active, reactive and apparent power per phase and in total, power factor, grid frequency, the switch temperature, and the cumulative and daily charge and discharge energy. Faults reported by the switch (grid, hardware, system, switch and other fault words) are shown as status messages on the device.
The STS is measured, not controlled The Sofar EMS never sends power setpoints to the STS and never switches it between grid and generator mode by itself. Control the battery through the EnjoyPowers PCS instead: see EnjoyPowers PV, hybrid and battery inverters.
The STS is connected over RS485 only. It communicates at 9600 baud, 8 data bits, no parity, 1 stop bit — the factory default settings.
| Device | Sofar EMS model OM1 | Sofar EMS model IG8 | RS485-USB converter | RS485-Ethernet converter |
|---|---|---|---|---|
| RS485 A | RS485 A | RS485_POS | RS485 A | TX+ |
| RS485 B | RS485 B | RS485_NEG | RS485 B | TX- |
| GND | RS GND | GND | Not available | G |
Two settings of the STS can be changed from the Sofar EMS. Open the Devices page, find the STS and click Change physical settings:
| Setting | Values | Description |
|---|---|---|
| STS enable | Disabled / Enabled (dedicated for PCS+STS systems) | Enables the static transfer switch. Only enable this in a PCS+STS system. |
| Diesel generator mode | Grid mode / Diesel generator mode | Selects whether the installation runs on the grid or on the diesel generator. |
Switching modes is a manual action Neither setting is changed automatically. The Sofar EMS only writes them when you change them here, and it does not switch to diesel generator mode on a grid outage. All other STS parameters (grid voltage and frequency limits, PCS host address, STS parallel master/slave, transformer soft-start) must be set on the STS itself.