Juntek Battery Monitor Bluetooth Integration

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1

I’m trying to add to home assistant this monitor, here i find a method using esphome but i was thinking if already have bluetooth connection why no use it. so i come across a guide for sniff the data from bluetooth and some of the code in

i rewrite the connection with bleak and added some more code, and now this is the output i get

INFO:root:{'power': 360.66, 'impedance': 10.11, 'mins_remaining': 1338, 'current': 13.61, 'discharge': 4.50254, 'ah_remaining': 307.294, 'soc': 85.35944444444445, 'voltage': 26.5}
INFO:root:{'power': 360.66, 'impedance': 10.11, 'mins_remaining': 1338, 'current': 13.61, 'discharge': 4.50264, 'ah_remaining': 307.29, 'soc': 85.35833333333333, 'voltage': 26.5}
INFO:root:{'power': 358.81, 'impedance': 10.11, 'mins_remaining': 1338, 'current': 13.54, 'discharge': 4.50264, 'ah_remaining': 307.29, 'soc': 85.35833333333333, 'voltage': 26.5}
INFO:root:{'power': 358.81, 'impedance': 10.11, 'mins_remaining': 1338, 'current': 13.54, 'discharge': 4.50274, 'ah_remaining': 307.287, 'soc': 85.3575, 'voltage': 26.5}
INFO:root:{'power': 360.4, 'impedance': 10.11, 'mins_remaining': 1338, 'current': 13.6, 'discharge': 4.50274, 'ah_remaining': 307.287, 'soc': 85.3575, 'voltage': 26.5}
INFO:root:{'power': 360.4, 'impedance': 10.11, 'mins_remaining': 1338, 'current': 13.6, 'discharge': 4.50284, 'ah_remaining': 307.283, 'soc': 85.35638888888889, 'voltage': 26.5}
INFO:root:{'power': 360.4, 'impedance': 10.29, 'mins_remaining': 1353, 'current': 13.6, 'discharge': 4.50284, 'ah_remaining': 307.283, 'soc': 85.35638888888889, 'voltage': 26.5}
INFO:root:{'power': 359.07, 'impedance': 10.29, 'mins_remaining': 1353, 'current': 13.55, 'discharge': 4.50284, 'ah_remaining': 307.283, 'soc': 85.35638888888889, 'voltage': 26.5}
INFO:root:{'power': 359.07, 'impedance': 10.29, 'mins_remaining': 1353, 'current': 13.55, 'discharge': 4.50293, 'ah_remaining': 307.279, 'soc': 85.35527777777777, 'voltage': 26.5}
INFO:root:{'power': 357.22, 'impedance': 10.29, 'mins_remaining': 1353, 'current': 13.48, 'discharge': 4.50293, 'ah_remaining': 307.279, 'soc': 85.35527777777777, 'voltage': 26.5}
INFO:root:{'power': 357.22, 'impedance': 10.29, 'mins_remaining': 1353, 'current': 13.48, 'discharge': 4.50303, 'ah_remaining': 307.275, 'soc': 85.35416666666666, 'voltage': 26.5}
INFO:root:{'power': 359.07, 'impedance': 10.29, 'mins_remaining': 1353, 'current': 13.55, 'discharge': 4.50303, 'ah_remaining': 307.275, 'soc': 85.35416666666666, 'voltage': 26.5}
INFO:root:{'power': 359.07, 'impedance': 10.29, 'mins_remaining': 1353, 'current': 13.55, 'discharge': 4.50313, 'ah_remaining': 307.272, 'soc': 85.35333333333332, 'voltage': 26.5}
INFO:root:{'power': 358.54, 'impedance': 10.29, 'mins_remaining': 1353, 'current': 13.53, 'discharge': 4.50313, 'ah_remaining': 307.272, 'soc': 85.35333333333332, 'voltage': 26.5}
INFO:root:{'power': 358.54, 'impedance': 10.29, 'mins_remaining': 1353, 'current': 13.53, 'discharge': 4.50323, 'ah_remaining': 307.268, 'soc': 85.35222222222222, 'voltage': 26.5}
INFO:root:{'power': 358.81, 'impedance': 10.29, 'mins_remaining': 1353, 'current': 13.54, 'discharge': 4.50323, 'ah_remaining': 307.268, 'soc': 85.35222222222222, 'voltage': 26.5}
INFO:root:{'power': 358.81, 'impedance': 10.29, 'mins_remaining': 1353, 'current': 13.54, 'discharge': 4.50333, 'ah_remaining': 307.264, 'soc': 85.35111111111111, 'voltage': 26.5}
INFO:root:{'power': 360.93, 'impedance': 10.29, 'mins_remaining': 1353, 'current': 13.62, 'discharge': 4.50333, 'ah_remaining': 307.264, 'soc': 85.35111111111111, 'voltage': 26.5}
INFO:root:{'power': 360.93, 'impedance': 10.27, 'mins_remaining': 1362, 'current': 13.62, 'discharge': 4.50333, 'ah_remaining': 307.264, 'soc': 85.35111111111111, 'voltage': 26.5}
INFO:root:{'power': 360.93, 'impedance': 10.27, 'mins_remaining': 1362, 'current': 13.62, 'discharge': 4.50343, 'ah_remaining': 307.26, 'soc': 85.35, 'voltage': 26.5}
INFO:root:{'power': 358.81, 'impedance': 10.27, 'mins_remaining': 1362, 'current': 13.54, 'discharge': 4.50343, 'ah_remaining': 307.26, 'soc': 85.35, 'voltage': 26.5}
INFO:root:{'power': 355.89, 'impedance': 10.27, 'mins_remaining': 1362, 'current': 13.43, 'discharge': 4.50343, 'ah_remaining': 307.26, 'soc': 85.35, 'voltage': 26.5}
INFO:root:{'power': 355.89, 'impedance': 10.27, 'mins_remaining': 1362, 'current': 13.43, 'discharge': 4.50353, 'ah_remaining': 307.257, 'soc': 85.34916666666666, 'voltage': 26.5}

what is the idea? i wanna create a Custom Integrations, but my knowles about this topic is basically null, and the documentation is too dense. maybe i can use some of the code from the AC Infinity Bluetooth integration, that my next step but if anyone can help o guide me to the right path.

2

I’ve been waiting for something like this and glad to see your progress! Thanks for pointing to Chriskomus page. Previously I was having to use RS485 tied to ESP32 or something Arduino and gave up.
One method we could try could be using command line sensors, but I don’t know how to run your script as a service. Command Line - Home Assistant, others use MQTT, another with pyscript.
Your output looks to be json already which can go right into mqtt topics or the command line method

# Example configuration.yaml entry
command_line:
  - sensor:
      name: JSON time
      json_attributes:
        - date
        - milliseconds_since_epoch
      command: "python3 /home/pi/.homeassistant/scripts/datetime.py"
      value_template: "{{ value_json.time }}"

GitHub - fl4p/batmon-ha: Add-on for Home Assistant to connect JK, JBD, Daly, ANT, SOK and Supervolt BMS via Bluetooth

A client of mine has a need for the Renogy controllers, while I have the Junctek K140f so I could test both actually. I need to go configure MQTT first though.

Ard00d has done the later half with setting up bt2-mqtt that maybe will be compatible to our Volts,Amps,watts, but need the amp hour section.

3

Hi. Has the project moved forward?

4

I am in the same boat. I do have a Renogy Rover and a Juntek KF series.

At this point, I was able to make a fork from ard00d to make the MQTT push a bit more relevant to the Rover, so it could have the same dataset as the app.

However I am running into issue, as there is no access to systemd from HASSIO, so the last part to turn it into a service doesn’t work, it basically only works if I manually run the bt2.py, which is not an option.

If anyone has any idea, I’m all ears!

As for the KF series Coulometer, I will start working on it this weekend and report back!

5

Edit :
I found the Bluteooth way was the worst idea with this device.
Juntek’s Bluteooth is plain bad (random value broadcast, no consistency, constant disconnect issues).

I have wrote a fork that is now working very well for my Juntek. I have mine on a RPi, and works on both Blutetooth and RS485. Although I would discourage you to use bluetooth as the Juntek’s implementation is reqlly dirty, the option is there.
The RS485 however is accurate, consistent and easy.
I used one of those USB to RS485 from Amazon for about $10. It then pushes the data to MQQT.

Project and details available on the github : GitHub - AnalogThinker/junctek_monitor: A Python program to pull Juntek Battery Monitor Data over BT or RS485 and post on MQTT

Juntek
Juntek487×592 24.8 KB

6

Hello, thank you for posting this. I purchased a K110F for my LifePo4 RV battery but haven’t been able to figure out how to pull my battery readings in to Home Assistant until this! I am going to try and get this working!

Do you think this adapter will do the trick?: Amazon.com: DX-CP24 RS485 to Bluetooth Serial Adapter Industrial Wireless Bluetooth Communication Module to Converter, Change Wired Device to Wireless, Supports Modbus Protocol, DC 5-36V for Android/iOS : Electronics

I know at the link you posted that you do not recommend Bluetooth, but I need wireless for my application. I was wondering if the RS-485 to Bluetooth was different then trying to pickup the Bluetooth signal from the K110F unit.

I think all I would need from there is the small RS-485 connector that plugs into the battery monitor that has bare wires on the other end.

Would the voltage to power the amazon product come out of the battery monitor? I’ve never used the RS-485 before.

Thanks in advance!!!