Entity for seeing losses of inverter losses at night

[AchWasss]

I have seen a increase of power usage when solar power is below 0.
So I wrote myself a new entity:

  - name: "Inverterlosses"
    unique_id: 
    unit_of_measurement: "W"
    device_class: power
    state_class: measurement
    # Losses from inverter and battery, only if this is negative (no solar power)
    state: "{{ min([float(states('sensor.solaredge_i1_dc_power'), 0)
             + float(states('sensor.solaredge_b1_dc_power'), 0), 0])|abs() |round(1) }}"      
    availability: "{{ has_value('sensor.solaredge_i1_dc_power') 
                   and has_value('sensor.solaredge_b1_dc_power') }}"

Can this be correct? I was a little bit surprised that the power draw of the inverter is around 70 Watts.
It does correspondent to the SinkTemp of the inverter.

Since I have a battery installed, it doubles my overall power consumption.
If the Battery does drop to backup state and the grid takes over it does indeed drop to the expected power draw again.