question

In case of Pilontech really could not provide ConsumedAmphours over the CAN, probably calculation could by done based on known full battery capacity and SOC. ConsumedAmphours = full battery capacity - full battery capacity * SOC / 100. But SOC value from Pilontech has 1% unit step, in case of your battery 400 Ah, ConsumedAmphours will changed with 4 Ah step.

Any way, it will allow to write python script to populate/update value of dbus data com.victronenergy.system ConsumedAmphours and read this data over the Modbus. Or you can read SOC over Modbus and perfom calculation on the your external platform.

Try ssh connection to the venus and run dbus-spy tool. For my system with battery monitor from dbus-spy:

com.victronenergy.system
Dc/Battery/BatteryService                      com.victronenergy.battery.ttyUSB0
Dc/Battery/ConsumedAmphours                                              -0.9 Ah

com.victronenergy.battery.ttyUSB0
ConsumedAmphours                                                          -0.9Ah
Devices/0/ProductName                                                    BMV-700

Thanks @Mikhail Petukhov. I see you have a BMV-700 monitor integrated. With this device the value is filled. But with the Pylontech Battery it is not possible - neither through modbus nor through mqtt (which should address the same data source / dbus - same as dbus-spy).

I will calculate it externally - thanks again.

The only other issue is that the Battery SOC can increase through AC and DC Charging and I just want to get the net consumed amp hours - I have to add something ($BATTERY_CHARGED_AH_BY_DC|AC) to the calculation.

Hi I still habe trouble with this value ... within dbus-spy I can see the value like c/Battery/ConsumedAmphours filled with the values which come in my case from my BMS ... but in modbus I always get 0 ...