Creating a sensor for consumption from battery level

Configuration
, ,
1

I have a sensor for the battery level of an E-Car “sensor.bl”. How can I calculate just consumption out of this and exclude charging of the battery? I tried several codes like this:

{% set current_bs = states('sensor.bl') | float %}
{% set previous_state = states.sensor.bl.last_changed %}
{% set previous_bs = states.bl.old_state.state | float if previous_state else 0 %}
{% set consumption = 0 %}
{% if previous_state %}
     {% set consumption = previous_bs - current_bs if current_bs < previous_bs else 0 %}
{% endif %}
{{ consumption | round(0) }}

The result is always 0. Thanks for your support.

2

Nobody here who can support? Thanks,
Holger

3

I’m assuming sensor.bl is the energy level of the battery in kWh? If it is a percentage the math will be a little different.

I think the easiest way would be to first make a template sensor (can be done in the UI) that is simply the sensor value subtracted from the battery size. For a 50 kWh battery it would be {{ 50 - states('sensor.bl') | float(50) }}

Then you can create a utility meter helper (also in the UI) using your new template sensor as the source. Make sure net metering is disabled, this will allow it to ignore charging.

4

Thanks, I’ll try.

5

It worked, thanks.