Home assistant custom component for calculating price of running a electric appliance with non-linear energy usage.

For getting the electricity prices the awesome Energi Data Service custom component from @MTrab is required.

Simulates the price using a rolling window: ![price_calc_principle]

Blue: electricity price
Black: energy usage
Red: calculated price for running appliance

THIS IS ONLY TESTED USING A SHELLY PLUG S

Creates a single sensor with current price and following attributes:

For best results a consistent energy usage of electric appliance is needed. I have tested it using af Shelly Plug S. When using default Shelly integration data was updated with inconsistency, ranging from update interval from 45-75 seconds.
When adding a REST sensor like this:

rest:
  resource: http://192.168.1.83/meter/0
  scan_interval: 1
  sensor:
    - name: "shelly_rest_energy"
      unique_id: "shelly_rest_energy"
      unit_of_measurement: "kWh"
      value_template: "{{ value_json.total / 60000 }}"

Update interval variance was less than 1 second. Make sure to delete this sensor after creating the price calc sensor to reduce network traffic.

If you already have downloaded a config file or added to the custom_components/price_calc/data you can select this file during setup. Be aware that you need to restart Home Assistant if file is added while Home Assistant is running.

You can share and download config files from https://github.com/fars-fede-fire/price_calc_data

1. Find the file you want to use in the repo and open it.
2. Click 'Raw' in the upper right corner.
3. Copy the URL and insert during setup when prompted.