Simple Python script to set the Goodwe Meter Target Power Offset to reduce imports.

set-goodwe-meter-offset.py

#!/usr/bin/env python

import pymodbus
from pymodbus.client import ModbusTcpClient

client = ModbusTcpClient('192.168.1.1', port=502)

if client.connect():
    unit_id = 247 
    reg_address = 47120

    print('--- Step 1: Reading Initial Value ---')
    initial_read = client.read_holding_registers(address=reg_address, count=1, device_id=unit_id)
    
    if initial_read.isError():
        print('Error reading initial value:', initial_read)
    else:
        raw_val = initial_read.registers[0]
        signed_val = raw_val - 65536 if raw_val > 32767 else raw_val
        print(f'Current Meter Target Power Offset: {signed_val} W')

        print('\n--- Step 2: Writing New Value (+20W for Export) ---')
        # Updated to device_id here as well
        write_res = client.write_registers(address=reg_address, values=[20], device_id=unit_id)
        
        if write_res.isError():
            print('Error writing to register:', write_res)
        else:
            print('Write command sent successfully.')

            print('\n--- Step 3: Verifying Change ---')
            post_read = client.read_holding_registers(address=reg_address, count=1, device_id=unit_id)
            
            if post_read.isError():
                print('Error reading verification value:', post_read)
            else:
                raw_val_post = post_read.registers[0]
                signed_val_post = raw_val_post - 65536 if raw_val_post > 32767 else raw_val_post
                print(f'New Meter Target Power Offset: {signed_val_post} W')
                
                if signed_val_post == 20:
                    print('\nVerification Success! The inverter has updated its target.')
                else:
                    print('\nVerification Failed: The value did not update to 20W.')

    client.close()
else:
    print('Failed to connect to the inverter IP address.')