Must2MQTT MQTT to modbus converter for MUST Inverter (forked fom https://github.com/softwarecrash/Solar2MQTT )

Features:

• captive portal for wifi and MQTT config
• config in webinterface
• get essential data over webinterface, get all data over MQTT
• classic MQTT datapoints or Json string over MQTT
• get Json over web at /livejson?
• firmware update over webinterface
• debug log on Wemos USB or Webserial
• blink codes for the current state of the ESP
• Reset functions
• Support Home Assistant

works with

• MUST PV18 devices

Main screen:

Settings:

Config:

How to use:

• Download the latest Firmware
• flash the bin file to an ESP8266 (recommended Wemos D1 Mini) with Tasmotizer
• connect the ESP like the wiring diagram
• search for the wifi ap "Must2MQTT-AP" and connect to it
• surf to 192.168.4.1 and set up your wifi and optional MQTT
• that's it :)

How-To video by Jarnsen

POWER: USB power from inverter USB port.

Parts required to build

Most of the parts can be bought as modules, it's usually cheaper that way.

• ESP8266 - Wemos D1 Mini or ESP8266-01
• MAX485 UART-RS48 module
• old RJ45 cable or connector

[basic functinality was forked from https://github.com/softwarecrash/Solar2MQTT]

command set taken from https://github.com/taHC81/MUST-ESPhome/blob/ae6d43f92bf3b2dc8efb78ba023e0eab26e041f2/PH1800%20PV1800%20EP1800%20PV3500%20EP3500%20RS485%20Modbud%20RTU%20communication%20Protocol%201.4.15.xlsx