Add calculated energy sensor for Home Assistant Energy dashboard

[11chri]

Add calculated energy sensor for Home Assistant Energy dashboard

Problem

The integration only exposes a power sensor (W) for my-PV heating devices.
To use the Home Assistant Energy dashboard, users had to manually create a Riemann Sum Integral helper to convert W → kWh.

Solution

Add a built-in Energy sensor that accumulates kWh from the device's power readings using time-delta integration on each coordinator update (every 5s). The sensor is directly compatible with the HA Energy dashboard.

Details

• New entity: sensor.<device>_energy with device_class: energy,
  state_class: total_increasing, unit: kWh, 3 decimal precision
• Device detection: Automatically finds the correct power data key
  for each device type:

  Device	Power Key
  SOL-THOR	power
  AC•THOR 9s	power_ac9
  AC•THOR	power_act
  AC ELWA 2	power_elwa2
  HEA•THOR IoT	power_grid

• State persistence: Uses RestoreEntity to restore accumulated
  energy on HA restart
• Offline protection: Skips accumulation if time delta > 1 hour
  to prevent spikes after prolonged disconnections
• Translations: Added "Energy" name in strings.json and en.json

Files changed

• sensor.py: Added POWER_KEYS constant, energy sensor creation
  logic in async_setup_entry, and MyPVEnergySensor class
• strings.json: Added entity translation for energy sensor
• translations/en.json: Added entity translation for energy sensor

Tests

I rebased my MR to My-PV HA integration, Version 0.0.1rc6 and tested locally with AC•THOR 9s

AC•THOR 9s can now be visualized in Energy Dashboard

[henningstuy]

A new integration on a good way. Until last week I used the REST-Entities for reading the AC-Thor9s values in a 30 second interval. For EMS the 5 second intervall is great.
However I also missed the energy-sensor. This evening I added the calculated energy-sensor. At the first new start of HomeAssistant the integration was loaded with a failure. I had to delete the old device an create a new device. Now it seems to run.
For testing I used the Boost mode, the energy-sensor raised up.
Energy in HA 0,12kWh
Energy in myPV-Cloud 0,10kWh

But using the Boost mode, the integration lost the connection to the AC-Thor9 for one or two cycles. Maybe there is still a time problem.

HomeAssistant Core 26.7.2
Installation in Docker on Synology NAS
AC-Thor 9s
Firmware: a0022401