Huawei Inverter Modbus Register 37121: Meter Imported Energy

Technical Definition

The register Meter Imported Energy at address 37121 is used to monitor meter imported energy on the Huawei Inverter.

• Protocol: Modbus RTU
• Data Type: S DWORD
• Unit: kWh
• 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 Meter Imported Energy (Address: 37121)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=37121, 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: "Meter Imported Energy"
  address: 37121
  value_type: S_DWORD
  unit_of_measurement: "kWh"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Huawei Inverter]

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

💡 Engineer's Insight

Analysis: Accumulated energy imported from the grid in kWh. Indicates total consumption over time.

Troubleshooting: Zero reading may indicate no import activity, communication loss, or meter malfunction.