Templating: Arithmetic mean under a condition

Hi!

I do calculate a value based on 3 frequencies:

  - platform: template
    sensors:
          netzfrequenz_mittelwert:
             friendly_name: "Mittelwert der Netzfrequenz"
             unit_of_measurement: "Hz"
             value_template: '{{ ((states("sensor.wr_links_freq") | float + states("sensor.wr_mitte_freq") | float + states("sensor.wr_rechts_freq") | float ) | float / 3) | round(3) }}'

This works fine, as long as all values are meaningful. Unluckily those values come from solar inverters wich are offline during the night. So I would like to “tune” this formula to use only values >40 and if none of the 3 inverters return a value >40 to use another sensor as source (sensor.l1_frequenz).

Could you please help me to achive this?

Best

Pascal

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