Device Sofar G3 Modbus Register 1740: Name inverter name bus voltage

Technical Definition

The register name inverter name bus voltage at address 1740 is used to monitor name inverter name bus voltage on the Device Sofar G3.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: V
• Access: Read Only

How to Read (Python pymodbus)

Use this code snippet to read this specific value via RS485:

from pymodbus.client.sync import ModbusSerialClient

client = ModbusSerialClient(method='rtu', port='/dev/ttyUSB0', baudrate=9600)
client.connect()

# Read name_inverter_name_bus_voltage (Address: 1740)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=1740, count=2, unit=1)

if not result.isError():
    print(f"Raw Value: {result.registers}")
else:
    print("Error reading register")

client.close()

Integration (Home Assistant)

Paste this into your configuration.yaml:

- platform: modbus_controller
  name: "name_inverter_name_bus_voltage"
  address: 1740
  value_type: U_WORD
  unit_of_measurement: "V"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Device Sofar G3]

    PLC -- "A+ (D+)" --> Device
    PLC -- "B- (D-)" --> Device
    PLC -- GND --> Device

💡 Engineer's Insight

Analysis: Bus Voltage (Volts). Internal DC bus voltage within the inverter.

Troubleshooting: Low/Zero: Inverter fault, power supply issue. High: Overvoltage fault, internal component failure.