question

So maybe it is also a good idea to post it in english.

Sorry, i am not a native speaker...

Hello, everyone,

I'm Dierk and I am new here :)

I've got a camper van and I am a fan of Victron products for a number of years now.

Since I started building a small island system in DIY at the beginning of the year, I seem to have been infected with the Victron virus.....

Regarding the problem or more precise the question:

I am currently working on the Venus OS on a Raspberry PI for said solar island system.

A Phoenix 500VA and an MPPT 75/15 are already connected there via ve.direct to USB and everything has worked wonderfully so far.

A Liontron 12.8V LX Smart battery, which is normally installed in our mobile home, serves as energy storage. But for that alone it's too good for me (idle for 48 weeks a year - after a year of use it has 10 charge cycles....)

I've already built a monitor for the mobile home that taps into the whole BMS thing via Bluetooth (can share the code if you want to).

A JBD BMS is installed internally in the battery, which is actually documented very cleanly, at least in terms of the protocol.

The Liontron has a few peculiarities there (register 0x03 must initially be queried at least 3 times), but they are also solved in the querying part.

The whole thing runs on a second Raspberry, which is only there for that bluetooth communication and it publishes that queried data via MQTT to the Venus or any other MQTT broker (as JSON).

The whole dataset is also written to an SQLite database for monitoring purposes (on PHP).

I've already gotten so far that I publish it to the Venus MQTT and also display it there in the Node RED dashboard (with the self-built PHP scripts it works on the BMS-Pi itself anyway).

I just need a nudge in the right direction on how the whole thing needs to be mapped towards Venus and MQTT.

Then you would have the information clean in the VRM and/or the Control Panel.

I am hoping that someone here has an idea regarding that.....

It might help others with similar batteries and might be a nice addition to the campers out there.

Kind regards,

Dierk

Since the Venus already has some mqtt tree where values can be read and also written (R/ W/ and so on) I also hoped that it could be possible without writing any driver......

Good morning !

I finally found a way....

Credits go to https://github.com/freakent/dbus-mqtt-devices for writing that mqtt device driver.

I only needed to extend the services.yml by:

battery:
  ProductId:
    default: 65535
  CustomName:
    default: "Liontron BMS"
    persist: true
  Soc:
    description: "%"
  Dc/0/Voltage:
    description: "V DC"
  Dc/0/Current:
    description: "A DC"
  Dc/0/Power:
    description: "W

My Liontron reader is then publishing to the topic

device/dg01/Status

a

{ "clientId": "dg01", "connected": 1, "version": "v1.0 ALPHA", "services": {"soc1": "battery"} }

and afterwards to the according topics under

W/<vrmid>/battery/<vrminstance>/Soc | Dc/0/Voltage | Dc/0/Current | Dc/0/Power

the according values out of the liontron.

At the moment its only doing it once every minute to not hammer the bluetooth bms like hell.

There could also be the option to also translate the Protection States of the Battery over to the venus.
But for me its at the moment sufficent to work with.

The device is also nicely showing up in the vrm.

Kind regards,

Dierk

Hi together,

there is a solution since a few weeks!

A direct Bluetooth connection of the Liontron battery (JBD BMS)

https://github.com/bradcagle/dbus-btbattery

Ich bin den Weg über einen ESP32 als Kopplung zur Liontron 200Ah gegangen.

Dabei habe ich eine gute Vorlage gefunden.

https://github.com/kolins-cz/Smart-BMS-Bluetooth-ESP32

Die habe ich dann dahingehend geändert, dass die Daten per MQTT gepublisht werden.

Da ich auch inzwischen wegen der Wlan Reichweite das ganze auf einem 2. ESP per LoRaWAN übertrage, stelle ich auch immer wieder das hakeln beim Kommunikationsaufbau fest.

@Dierk Grossfeld Danke für den Tipp mit dem mindestens 3 mal Telegramm 3 abfragen, werde mal schauen ob ich da schnellere Verbindung bekomme wenn ich nicht toggle und erst einmal in kürzeren Intervallen abfrage bis die Antwort kommt.

Liebe Grüße

Gisbert