Project to communicate to Pylontech Batteries using RS-485 serial communication Based on the Pylontech-Python library of Tomcat42
It consist of 1 to 15 Pylontech batteries (US5000 and US3000C) in one group connected with a RJ45 plug (pin6 GND, pin7 A, pin8 B) to a Waveshare 2-Channel RS485 Module for Raspberry Pi Pico, SP3485 Transceiver, UART to RS485. The Raspberry Pico W is programmed with a Raspberry 400 with Thonny in micropython.
The program consists of:
- pylontech_base that communicates with the UART0 of the pico via channel 0 of the RS485 module
- the pylontech_encode and _decode implement the RS485 Pylontech protocol
- menu.py is an interface for the communication and has a primitive terminal interface to test the functionality
- wlan.py connect the pico to the local network, it needs the local SSID and Password
- html_server.py is the main program to interact with the batteries with a webbrowser
Installation by copying the files to the pico:
run by starting the html_server.py or renaming it to main.py
starting in a terminal from minicom with:
exec(open('html_server.py').read()))
For performance and robustness two modules are added: logging and memory: -logging to regulate, redirect and minimize, the standard/serial output in production -memory to check the pico sram and filesystem in a separate thread -a heartbeat timer may ping the local router to check connectivity