This project allows you to control and monitor Pylontech US2000B, US2000C, US3000C and US5000 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 , US3000C, US5000 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 or US5000: 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/US5000 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 11-12)
If you want MQTT support, uncomment line 15 and fill details in lines 20-24
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

Example of sensors in Home Assistant:

mqtt:

  sensor:
    - name: "Livello Carica Batteria"
      state_topic: "homeassistant/sensor/grid_battery/soc"
      unit_of_measurement: "%"
      device_class: battery
      
    - name: "Stato Batteria"
      state_topic: "homeassistant/sensor/grid_battery/base_state"
      
    - name: "Temperatura Batteria"
      state_topic: "homeassistant/sensor/grid_battery/temp"
      unit_of_measurement: "°C"
      device_class: temperature
      
    - name: "Num Batterie"
      state_topic: "homeassistant/sensor/grid_battery/battery_count"
      
    - name: "Potenza impegnata Batterie"
      state_topic: "homeassistant/sensor/grid_battery/getPowerDC"
      unit_of_measurement: "Wh"
      device_class: energy
      
    - name: "Potenza carica Batterie"
      state_topic: "homeassistant/sensor/grid_battery/powerIN"
      unit_of_measurement: "Wh"
      state_class: "total_increasing"
      device_class: "energy"
      icon: mdi:flash

      
    - name: "Potenza scarica Batterie"
      state_topic: "homeassistant/sensor/grid_battery/powerOUT"
      unit_of_measurement: "Wh"
      state_class: "total_increasing"
      device_class: "energy"
      icon: mdi:flash

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