Two independent meters. How to subtract?

Energy
1

I have two Energy Meters independent. One is the electricity generated by my solar system, and other is power consumption installed on my distribution board.

I’d like to know how could I create an entity to subtract Power consumption from Generated Energy. The result will be the Energy Returned.

2

You can’t subtract power from energy, they are two different things. Assuming you meant “subtract Power consumption from Generated power”:

You can use a template helper.

Settings → Devices & Services → Helpers → Add Helper → Template → Template a sensor

Then Add these options:

  • Name: Whatever you want
  • Template:{{ states('sensor.generated_power')|float - states('sensor.consumption_power')|float }} Replace the entity ids with your actual entity’s ids.
  • Unit of measurement: W
  • Device class: power
  • State class: measurement
  • Device: Optional. Only specify this if you want to add this entity to an existing device.
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