SofarSolar Inverter (battery)

Installation

1. 1Enable Modbus RTU on the SofarSolar inverter: on the inverter's LCD panel, navigate to the communication or Modbus settings section and confirm that RS485 communication is active with slave address 1 and baud rate 9600, 8 data bits, no parity, 1 stop bit.
2. 2Wire the RS485 port: connect the inverter's A+ and B- terminals to the corresponding terminals on the ModbusCloud Gateway using a shielded twisted-pair cable; keep the cable run as short as practical and add a 120-ohm termination resistor if the bus has multiple devices.
3. 3In the ModbusCloud portal, add a new gateway, then open the template library and import the SofarSolar Inverter (battery) template; assign the correct Modbus unit ID (default 1) and confirm the RTU baud rate matches the inverter setting.
4. 4Verify the connection by checking the live register view in the portal: address 525 should show a non-zero power value when the battery is actively charging or discharging, and address 528 should show a state-of-charge value between 0 and 100.

Things to watch for

01

The gateway connects but both registers return zero or no data.

Confirm the Modbus slave address on the inverter matches the unit ID configured in the portal (default is 1). Also verify baud rate is set to 9600 with 8N1 framing on both sides. A mismatch on either setting will cause silent failures where the bus is physically active but no valid response is returned.

02

Register values appear but the power reading looks wrong or inverted.

Register 525 is a signed int16, so a value read as a large positive number may actually be a negative value in two's complement, indicating charging. Verify that your Modbus master is interpreting the register as int16, not uint16. SofarSolar uses big-endian byte order on this register.

03

Communication drops intermittently on the RS485 bus.

Check wiring polarity first: on the SofarSolar RJ45 RS485 socket, pins 2, 3, and 4 are A+ and pins 1, 5, and 6 are B-. Swapping A and B is a common cause of intermittent failures. Add a 120-ohm termination resistor at the far end of the bus if more than one device is connected, and keep stub lengths short.

04

The register map varies between firmware versions. Which version is required?

SofarSolar's Modbus register addresses differ between inverter families and firmware generations. Addresses 525 and 528 correspond to the battery series addressed by this OpenEMS-derived template. If your inverter returns unexpected values or errors, check the serial number against the official SofarSolar Modbus protocol document for your specific model series to confirm register compatibility.

Registers (2)

2 read / 0 write

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