This project allows you to control and monitor Pylontech US2000B 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 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
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:

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

How to get going:

Get Wemos D1 mini
Install arduino IDE and ESP8266 libraries as described here
Open PylontechMonitoring.ino in arduino IDE
Specify your WiFi login and password at the top of the file (line 13-14)
Upload project to your device
Connect Wemos D1 mini to the MAX3232 transreceiver
Connect transreceiver to RJ10 as descibed in the schematics (all three lines need to be connected)
Connect RJ10 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

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