- sensor:
    - name: "Energy Total"
      unique_id: energy_total
      state: >-
        {{ states('sensor.shelly3em_channel_a_energy')|float + 
           states('sensor.shelly3em_channel_b_energy')|float + 
           states('sensor.shelly3em_channel_c_energy')|float }}
      unit_of_measurement: kWh
      device_class: energy
      state_class: measurement
      attributes:
        last_reset: "1970-01-01T00:00:00+00:00"
    - name: "Power Total"
      unique_id: power_total
      state: >-
        {{ (states('sensor.shelly3em_channel_a_power')|float + 
            states('sensor.shelly3em_channel_b_power')|float + 
            states('sensor.shelly3em_channel_c_power')|float) }}
      unit_of_measurement: W
      device_class: power
      state_class: measurement
    - name: "Power Factor Total"
      unique_id: power_factor_total
      state: >-
        {{ (((states('sensor.shelly3em_channel_a_power')|float) * (states('sensor.shelly3em_channel_a_power_factor')|float) +
              (states('sensor.shelly3em_channel_b_power')|float) * (states('sensor.shelly3em_channel_b_power_factor')|float) +
              (states('sensor.shelly3em_channel_c_power')|float) * (states('sensor.shelly3em_channel_c_power_factor')|float)) /
            (states('sensor.shelly3em_channel_a_power')|float + states('sensor.shelly3em_channel_b_power')|float + states('sensor.shelly3em_channel_c_power')|float))
            |int }}
      unit_of_measurement: "%"
      device_class: power_factor
      state_class: measurement