Device Sofar G3 Modbus Register 1159: Name inverter name ac output reactive power

Technical Definition

The register name inverter name ac output reactive power at address 1159 is used to monitor name inverter name ac output reactive power on the Device Sofar G3.

• Protocol: Modbus RTU
• Data Type: S WORD
• Unit: kVar
• 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_ac_output_reactive_power (Address: 1159)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=1159, 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_ac_output_reactive_power"
  address: 1159
  value_type: S_WORD
  unit_of_measurement: "kVar"

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: Reactive power delivered or consumed from the AC grid. Units: Volt-Ampere Reactive (VAR). Essential for grid voltage stability.

Troubleshooting: Unexpected values might indicate grid issues or inverter configuration problems. Zero is common if not specifically configured for reactive power control.