Sunways STH Modbus RTU

Installation

1. 1Connect the ModbusCloud gateway (MCG or MLP series) to the Sunways STH RS-485 port using a twisted-pair cable with correct A, B, and GND wiring.
2. 2Set the Sunways STH Modbus slave address via the inverter display or configuration menu, and note the address for gateway configuration.
3. 3Confirm the inverter baud rate is set to 9600, matching the template default.
4. 4In the ModbusCloud portal, add a new device and import the Sunways STH Modbus RTU template from the template library.
5. 5Enter the configured Modbus slave address in the device settings on the ModbusCloud portal.
6. 6Verify data is flowing by checking live register values on the dashboard, paying attention to PV power and battery SOC readings.

Things to watch for

Registers (49)

49 read / 0 write

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