Need your help: Energy Sensor issue

Hi community,

I need your help regarding a energy sensor showing up correctly in the dashboard.

I have two Fronius inverters from which I extract the Watts with NodeRed and forward them to HA. Both MQTT sensors show up with the correct watts in HA.

Then I created a template to sum up both inverter values to one.

  - sensor:
      - name: "Fronius Together" # WIRD FÜR ENERGY DASHBOARD VERWENDET
        state: "{{ (states('sensor.fronius_symo_gen24')|float + states('sensor.fronius_symo_8')|float)|round(0) }}"
        unit_of_measurement: Wh
        device_class: energy
        state_class: measurement
          last_reset: '1970-01-01T00:00:00+00:00'

Then I created a utility meter to show up in energy dashboard. But this sensor does not show correct values.

What am I doing wrong? Or do you have a better way to get the energy dashboard working from 2 mqtt values sumed up?

Appreciate your help… :wink: