Measure Energy from power for Energy Dashboard

Configuration
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1

Hello
I have Sonoff POWR320D (Firmware: 1.1.1)
SonoffLAN: 3.6.0

Device provides Power, Current and Voltage entities.
Energy dashboard in HA requires Energy entity
(having device class=energy, state_class=total_increasing)

I tried few ways to get energy from power.
One i tried is as follow:

sensor:
  - platform: integration
    source: sensor.sonoff_10017fa545_power
    name: Sensor Terrace Heater energy_spent
    unit_prefix: k
    round: 2

Issue: However, this gives wrong result. Numbers are almost double then actual energy usage.

Another method i tried:

utility_meter:
  powr320d_daily_energy:
    source: sensor.sonoff_10017fa545_power 
    cycle: daily

Issue: This entity is not shown in Energy dashbaord.
Following is the detail about entity. May be since unit is W, it is not showing in energy dashboard.

state_class: total_increasing
source: sensor.sonoff_10017fa545_power
status: collecting
last_period: 147065.97
last_valid_state: 2241.29
meter_period: daily
cron pattern: 0 0 * * *
last_reset: 2024-02-23T18:30:00.015233+00:00
unit_of_measurement: W

And also it gives too much high reading than actual usage.
Actual usage was 13kwh, while showed 62kwh when i checked entity properties.

Method 3 Tried:

template:
  - sensor:
      - name: "Heater Energy"
        unique_id: "heater_energy"
        unit_of_measurement: "kWh"
        state_class: "total_increasing"
        device_class: "energy"
        state: >
          {{ (states('sensor.sonoff_10017fa545_power') | float / 1000) * (1 / 60) }}
        attributes:
          last_reset: "1970-01-01T00:00:00+00:00"

Issue: It shows double usage than actual usage in Energy dashboard.
Error Log: Entity sensor.heater_energy from integration template has state class total_increasing, but its state is not strictly increasing.

Please suggest, what is the right method to get energy from power and usable under energy dashboard.

Thanks

2

The fist method was correct but likely you were seeing approximation errors from using the default trapezoidal integration method. Try this:

sensor:
  - platform: integration
    source: sensor.sonoff_10017fa545_power
    name: Sensor Terrace Heater energy_spent
    method: left
    unit_prefix: k
    round: 2

You can read about the integration method choice in the documentation, https://www.home-assistant.io/integrations/integration/#integration-method

The sensor.sonoff_10017fa545_power sensor needs the following attributes:

device_class: power
state_class: measurement

If any are missing use customize to add them.