Pylontech Battery Monitoring via WiFi

This project allows you to control and monitor Pylontech US2000B, US2000C and US3000C batteries via console port over WiFi. It it's a great starting point to integrate battery with your home automation.

I ACCEPT NO RESPONSIBILTY FOR ANY DAMAGE CAUSED, PROCEED AT YOUR OWN RISK

Features:

• Low cost (around 20$ in total).
• Adds WiFi capability to your Pylontech US2000B/C or US3000C battery.
• Device exposes web interface that allows to:
  • send console commands and read response over WiFi (no PC needed)
  • battery information can be retrevied also in JSON format for easy parsing
• MQTT support:
  • device pushes basic battery data like SOC, temperature, state, etc to selected MQTT server
• Easy to modify code using Arduino IDE and flash new firmware over WiFi (no need to disconnect from the battery).

See the project in action on Youtube:

Parts needed and schematics:

• Wemos D1 mini microcontroller.
• SparkFun MAX3232 Transceiver.
• US2000B: Cable with RJ10 connector (some RJ10 cables have only two wires, make sure to buy one that has all four wires present).
• US2000C: Cable with RJ45 connector (see below for more details).
• Capacitors C1: 10uF, C2: 0.1uF (this is not strictly required, but recommended as Wemos D1 can have large current spikes).

US2000C/US3000C notes:

This battery uses RJ45 cable instead of RJ10. Schematics is the same only plug differs:

• RJ45 Pin 3 (white-green) = R1IN
• RJ45 Pin 6 (green) = T1OUT
• RJ45 Pin 8 (brown) = GND

How to get going:

• Get Wemos D1 mini
• Install arduino IDE and ESP8266 libraries as described here
• Open PylontechMonitoring.ino in arduino IDE
• Make sure to copy content of libraries subdirectory to libraries of your Arduino IDE.
• Specify your WiFi login and password at the top of the file (line 13-14)
• If you want MQTT support, uncomment line 17 and fill details in lines 21-24
• Upload project to your device
• Connect Wemos D1 mini to the MAX3232 transreceiver
• Connect transreceiver to RJ10/RJ45 as descibed in the schematics (all three lines need to be connected)
• Connect RJ10/RJ45 to the serial port of the Pylontech US2000 battery. If you have multiple batteries - connect to the master one.
• Connect Wemos D1 to the power via USB
• Find what IP address was assigned to your Wemos by your router and open it in the web-browser
• You should be able now to connunicate with the battery via WiFi