Device Sofar G3 Modbus Register 1067: Name inverter name pv isolation resistance

Technical Definition

The register name inverter name pv isolation resistance at address 1067 is used to monitor name inverter name pv isolation resistance on the Device Sofar G3.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: Ohm
• 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_pv_isolation_resistance (Address: 1067)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=1067, 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_pv_isolation_resistance"
  address: 1067
  value_type: U_WORD
  unit_of_measurement: "Ohm"

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: Inverter's PV string isolation resistance. Units: Megaohms (MΩ). Measures electrical insulation integrity between PV circuits and ground.

Troubleshooting: Low or zero values indicate insulation degradation or grounding faults, posing safety risks and potentially causing shutdown.