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GivEnergy Modbus

A Python library for communicating with GivEnergy inverters via Modbus TCP on a local network, with no dependency on the GivEnergy Cloud. Inspired by and originally built on pymodbus, it now provides its own asyncio-based framer, decoder and PDUs specific to the GivEnergy implementation.

⚠️ This project makes no representations as to its completeness or correctness. You use it at your own risk — if your inverter mysteriously explodes because you accidentally set the BOOMTIME register or you consume a MWh of electricity doing SOC calibration: you really are on your own. We make every effort to prevent you from shooting yourself in the foot, so as long as you use the client and its exposed methods, you should be perfectly safe.

• Documentation: https://dewet22.github.io/givenergy-modbus
• GitHub: https://github.com/dewet22/givenergy-modbus
• PyPI: https://pypi.org/project/givenergy-modbus/
• Free software: Apache-2.0

Features

• Reading all registers and decoding them into their representative datatypes
• Writing data to holding registers that are deemed to be safe to set configuration on the inverter

How to use

The client is async. Use it inside an asyncio event loop; commands are plain functions that return request lists which you send via one_shot_command or execute:

import asyncio
from givenergy_modbus.client.client import Client
from givenergy_modbus.client import commands
from givenergy_modbus.model import TimeSlot
from givenergy_modbus.model.inverter import Model

async def main():
    client = Client(host="192.168.99.99", port=8899)
    await client.connect()

    # Detect the topology once, then read the config banks (needed for slot_map)
    await client.detect()
    await client.load_config()
    plant = client.plant

    # Write configuration to the device
    await client.one_shot_command(commands.set_charge_target_enabled(80))
    # set a charging slot from 00:30 to 04:30; slot_map selects correct registers for this model
    await client.one_shot_command(
        commands.set_charge_slot(1, TimeSlot.from_components(0, 30, 4, 30), plant.inverter.slot_map)
    )
    # set the inverter to charge from excess solar and discharge to meet demand
    await client.one_shot_command(commands.set_mode_dynamic())

    assert plant.inverter_serial_number == 'SA1234G567'
    assert plant.inverter.model == Model.HYBRID
    assert plant.inverter.enable_charge_target
    assert plant.inverter.charge_slot_1 == TimeSlot.from_components(0, 30, 4, 30)
    assert plant.inverter.model_dump() == {
        'serial_number': 'SA1234G567',
        'device_type_code': '3001',
        'charge_slot_1': TimeSlot.from_components(0, 30, 4, 30),
        ...
    }
    assert plant.inverter.model_dump_json() == '{"serial_number": "SA1234G567", "device_type_code": "3001", ...'

    assert plant.batteries[0].serial_number == 'BG1234G567'
    assert plant.batteries[0].v_cell_01 == 3.117
    assert plant.batteries[0].model_dump() == {
        'bms_firmware_version': 3005,
        'cap_design': 160.0,
        ...
    }
    assert plant.batteries[0].model_dump_json() == '{"serial_number": "BG1234G567", "v_cell_01": 3.117, ...'

    await client.close()

asyncio.run(main())

Credits

This package was created with Cookiecutter and the waynerv/cookiecutter-pypackage project template.