Growatt Modbus

This library natively reads data provided by a growatt inverter. Parsing is based on the documentation "Growatt Inverter Modbus RTU Protocol_II" (V1.05 2018-04-19).

Setup

On MIN/MIC models connect the pin 3 and 4 (modbus A and B) of the growatt COM connector to a modbus to serial converter (e.g. rs485 to TTL converter). Multiple inverters can be connected to the same converter. The modbusId can be changed in the configuration menu of the inverter (default: 1).

On SPH models, set RS485 mode to VPP and use Port RS485-1, pins 4 and 5 (modbus A and B).

Installation

yarn add growatt-modbus

Usage

import GrowattClient from 'growatt-modbus';

(async () => {
    const growattClient = new GrowattClient({
        baudRate: 9600,
        device: '/dev/ttyAMA0',
        modbusId: 1
    });
    await growattClient.init();
    const data = await growattClient.getData();
})();

Output Example

Tested devices

• Growatt MIC 2500TL-X
• Growatt MIN 4200TL-XE
• Growatt SPH 10000TL3 BH-UP

Contributing

The parsed data is far from everything the inverter provides but enough for my needs right now. Feel free to open a PR to support information.