I have been trying to get BMV 712 values into home assistant. I seem to be on the right track. I am using a VE direct cable into a USB port on the PI. I am getting some data from the BMV, but something is not working properly. The BMV is supposed to send the values every second or so to the USB port in a tab delimited format. I am managing to read one value, and then that's it. Does anyone have any clues as to what the problem can be?

I have it set up as follows in the configuration.yaml file :

Quote

 

#BMV
  - platform: serial
    serial_port: /dev/serial/by-id/usb-VictronEnergy_BV_VE_Direct_cable_VE4A9OUM-if00-port0
    name: BMV712
    baudrate: 19600

  - platform: template
    sensors:
      bmv_data:
        friendly_name: Anything
        unit_of_measurement: "V"
        value_template: "{{ states('sensor.serial_sensor').split('\t')[0] states('sensor.serial_sensor').split('\t')[1] }}"
      

 

I have fiddled around with many permutations of the value template and only get this:

That is correct and is the amount of charged energy and agrees with what I see on the victron app, but it is static and only changes with a reboot of the pi (s I assume it is reading one line of data and nothing further)

 Anyone have any ideas how to get the other values, and how to get the values to update periodically?

This is the message format :

I also came across this guy who managed to get it right with a script that writes the data to a file which then gets parsed into HA. (translated from Norwegian) : https://translate.google.com/translate?sl=auto&tl=en&u=https%3A%2F%2Fbaatplassen.no%2Fi%2Ftopic%2F141981-b%C3%A5tautomasjon-med-batterioverv%C3%A5king-og-zigbee%2F

I linked mine up to the Colour GX which was very easy in the end - cant help with BMV though sorry:

Added this to Configuration.yaml and had to "enable modbus-TCP" on Colour GX :

sensor:

  - platform: modbus
    registers:
    - name: Grid power
      hub: victron
      unit_of_measurement: "W"
      slave: 100
      register: 820
    - name: Solar power
      hub: victron
      unit_of_measurement: "W"
      slave: 100
      register: 850
    - name: Load
      hub: victron
      unit_of_measurement: "W"
      slave: 100
      register: 817
    - name: Battery
      hub: victron
      unit_of_measurement: "%"
      slave: 100
      register: 843
    - name: Grid Failure
      hub: victron
      unit_of_measurement: "State"
      slave: 100
      register: 826

https://community.victronenergy.com/questions/12314/connecting-rpi-with-venusos-mqtt-to-home-assistant.html

Edited March 4, 20205 yr by Tim

Hello,

Did you come right with this? 

I managed to get it working with a nodemcu board posting values to MQTT with a BMV-600 though.

 

Another way is to pull the data via node red (js) and then post to mqtt.

i use icc to spit out mqtt onto my homeassiatants mqtt broker then pull the data from that