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Sunways STH Modbus RTU

by Laszlo SoosNo rating yet244 downloads

Content languageEnglish

Download · v1.0.0Add to favourites

Updated Feb 24, 2025

Download · v1.0.0

Description

ModBus template for reading values from Sunways STH inverter over RTU.

Inputs and outputs · 50

NameTypeUnit
Total Grid-Injection Energy on MeterModbuskWh
Phase A Power on MeterModbusW
Phase B Power on MeterModbusW
Phase C Power on MeterModbusW
Total Power on MeterModbusW
PV Input Total PowerModbusW
Battery PowerModbusW
Battery SOCModbus%
Inverter Running Status ValueModbus<v>
Total Purchasing Energy from Grid on MeterModbuskWh
Current Load PowerModbusW
Total PV Generation on that dayModbuskWh
Temperature Sensor 1Modbus°C
Temperature Sensor 2Modbus°C
Temperature Sensor 3Modbus°C
PV1 VoltageModbusV
PV1 CurrentModbusA
PV2 VoltageModbusV
PV2 CurrentModbusA
PV1 Input PowerModbusW
PV2 Input PowerModbusW
PV Generation Energy on that dayModbuskWh
Total PV Generation from InstallationModbuskWh
Total PV Generation Time from InstallationModbusH
Grid Injection Energy on that day[Meter]ModbuskWh
Grid Purchasing Energy on that day[Meter]ModbuskWh
Backup Output Energy on that dayModbuskWh
Battery Charge Energy on that dayModbuskWh
Battery Discharge Energy on that dayModbuskWh
Loading Energy on that dayModbuskWh
Energy Purchased from Grid on that dayModbuskWh
Total Energy injected to gridModbuskWh
Total Energy Purchased from Grid from MeterModbuskWh
Total Output Energy on backup portModbuskWh
Total Energy Charged to BatteryModbuskWh
Total Energy Discharged from BatteryModbuskWh
Total PV GenerationModbuskWh
Total Loading Energy consumed at grid sideModbuskWh
Total Energy Purchased from Grid at inverter sideModbuskWh
Battery DC VoltageModbusV
Battery DC CurrentModbusA
Battery Mode ValueModbus<v>
BMS Charge ImaxModbusA
BMS Discharge ImaxModbusA
Battery SOHModbus%
BMS StatusModbus<v>
BMS Pack TemperatureModbus°C
Cell Temperature MaxModbus°C
Cell Temperature MinModbus°C
Working Mode ValueModbus<v>

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Questions and answers

  1. Numbers of energy

    Open

    Václav Talhofer

    Hi, thanks for this library. I have small question. After implementing in Loxone, numbers from STH are quite big. Meters are on GW of energy, instead of kW. Did you have the same trouble with that? If yes, what was the solution?

    Thanks, Vaclav

    1 reply

    1. Laszlo SoosCreator

      Hi Václav,

      I did not have this problem. I just checked the modbus gives KW for me eg for "Battery Power". I just divide it by 1000 to get W and connecting that to Meter block after that.

      Regards, László

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