Hello guys,
I wanted to have some battery statistics also in my home assistant (Energy from battery / Energy into battery).
I tried it with the following MQTT topics and expected a kWh Counter, but those values are quite too high.
N/XXXX/battery/512/History/ChargedEnergy
N/XXXX/battery/512/History/DischargedEnergy
Can anyone help me and explain what is the unit behind those topics?
Is there any documentation on this?
Thank you, best Regards, Dominik
Hi. I was looking for the same data, but couldn't find anything in the MQTT topics.
In my case the History topic is actually empty.
The solution for me will be to calculate this data using my domoticz installation. Using MQTT and nodered I will update a virtual energy counter in domoticz, which will result in exactly what I'm looking for...
Hi @ds1707
You don't say what device you're looking at, but seems like a shunt. Those values are indeed kWh, and cumulative back to the date they were last reset, There's some pics here, but not much explanation.. https://www.victronenergy.com/media/pg/VictronConnect_Manual/en/application-overview.html
Maybe try the product manual for more.
You can find more info in the excel sheet "CCGX-Modbus-TCP-register-list-2.90", the mqtt path can be found in column "dbus-obj-path" and don't forget to apply the "Scalefactor". In this case (for ChargedEnergy andDischargedEnergy) 10, so you need to divide the values by 10.
It can also be that your battery doesn't provide this data and it will return 0 or some default fixed value.
I'm using a Pylontech battery and the MQTT topics are
I think it depends on the battery / BMS if this data is available.
same here. Luckly my EV-Wallbox keeps track of this and reports back via mqtt as well ;-)
I am using these to feed it into my TIG stack in my NAS.
...sure, here it is Battery-JSON.txt
Yes, as said, I am using a TIG stack. All data is mqtt based and created either from external devices, like the Cerbo or my Wallbox, or via Node-Red flows and is then captured via telegraf into influxdb.
I am using mqtt bridge(s) to fetch the "raw" mqtt topics from the brokers of other devices and then use Node-Red to transform these into my own topics...my NAS is quite powerful and runs 24x7 anyway.
