EnjoyPowers SinE-STS static transfer switch
EnjoyPowers
Supported Devices
| 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 Sunlight Group 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.
Note
The STS is measured, not controlled The Sunlight Group 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.
Wiring
RS485
The STS is connected over RS485 only. It communicates at 9600 baud, 8 data bits, no parity, 1 stop bit — the factory default settings.
RS485 Wiring
- For correct RS485 wiring: Follow the guidelines for RS485 wiring.
- If the wiring shown in the table below is incorrect, please let us know.
- There is no general consensus in the industry about the usage of A and B for the RS485 polarity, so it may be counterintuitive and opposite of what you might expect for some devices.
| Device | Sunlight Group EMS model OM1 | Sunlight Group 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 |
Configuration
NOTE: RS485 Device Addresses
- You MUST give each device on the RS485 bus a unique address. Check the manual of the device on how to do this.
- Use lower addresses first (1, 2, ...) because the Sunlight Group EMS will find them faster!
- For each device, it is generally recommended to stick with the factory default baud rate, parity, and stop bits. The Sunlight Group EMS will scan on those first.
Settings on the STS
Two settings of the STS can be changed from the Sunlight Group 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. |
Warning
Switching modes is a manual action Neither setting is changed automatically. The Sunlight Group 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.