Huawei Inverter Modbus Register 30075: Info Maximum Active Power

Technical Definition

The register Info Maximum Active Power at address 30075 is used to monitor info maximum active power on the Huawei Inverter.

• Protocol: Modbus RTU
• Data Type: U DWORD
• Unit: kW
• 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 Info Maximum Active Power (Address: 30075)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=30075, 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: "Info Maximum Active Power"
  address: 30075
  value_type: U_DWORD
  unit_of_measurement: "kW"

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: Info Maximum Active Power: The maximum continuous active power the inverter can deliver. Units: Watts (W) or Kilowatts (kW).

Troubleshooting: Zero value indicates an error or unconfigured device. Check inverter specifications and operational limits.