What is the difference between the sensors "X" and "X [Tariff-API]"?

[mpw96]

Where X is either Grid Tariffs or Solar Prognoses.
Hi, could you please explain this for the rest of us? Looking at the code did not help me. Sorry.

I would like to build a nice forecast for sun and price with APEX Chart Card (something like this https://www.youtube.com/watch?v=R0knPiJk3ts) and I want to pull all data from evcc.

T&R
MP

[mpw96]

On the shoulders of giants! Thank you @marq24!

[mpw96]

type: custom:apexcharts-card
apex_config:
  chart:
    height: 400px
  colorize_states: true
graph_span: 2d
span:
  start: day
  offset: "+0"
now:
  show: true
  label: Jetzt
yaxis:
  - id: kwh
    min: 0
    apex_config:
      tickAmount: 5
  - id: euro
    min: 0
    max: 1.5
    opposite: true
    decimals: 4
    apex_config:
      tickAmount: 5
series:
  - entity: sensor.evcc_tariff_api_solar
    unit: kWh
    yaxis_id: kwh
    name: Prognose
    type: line
    color: yellow
    data_generator: |
      return entity.attributes.rates.map((start, index) => {
        return [new Date(start["start"]).getTime(), entity.attributes.rates[index]["value"]/1000.0]
      });
    show:
      legend_value: false
      in_header: false
    stroke_width: 4
    float_precision: 2
    extend_to: false
  - entity: sensor.evcc_pv_power
    unit: kWh
    transform: return x/1000.0
    yaxis_id: kwh
    name: Ertrag
    type: area
    color: green
    show:
      legend_value: false
      in_header: false
    stroke_width: 2
    float_precision: 2
    extend_to: false
    group_by:
      func: avg
  - entity: sensor.evcc_tariff_api_grid
    unit: Euro
    yaxis_id: euro
    name: Preis
    type: column
    color: orange
    data_generator: |
      return entity.attributes.rates.map((start1, index1) => {
        return [new Date(start1["start"]).getTime(), entity.attributes.rates[index1]["value"]]
      });
    show:
      legend_value: false
      in_header: false
    stroke_width: 1
    float_precision: 4

[marq24]

The EVCC API offers the prognosis data in two different places of the API...

1. as part of the state response
2. as separate API endpoint

The initial implementation is based on the additional /tariff/{type} endpoint - this implied, that per prognosis type (grid & solar) the code must perform an additional request to the evcc backend. Since I am a bit older, I still believe, that taking care about resource usage matters - In my world every bytes matters... So I have implemented a special handing for the /tariff/{type} enpoints - they will be called just every full hour... since they should not change in this period.

That's said, after my initial implementation I have realized, that tariff data was/is also present in the state response object (of course when queried) - and when I switch the implementation over to the websocket stuff the data is also present in every socket package that will be received from the evcc server...

So coming back to your question - the Entities with the [Tariff API] in their names are the ones that make use of the /tariff/{type} - I can't exactly remember but I think the attributes are slightly different...

The 'same' Entities without the [Tariff API] will get the data from the state object - technically both should return the same information in the main array field - but as mentioned, I believe the additional available attributes are slightly different.

I hope this answers your question - the final 'correct' answer is obviously in the source code :-D

[UDicke]

Hello @mpw96, thanks for your Apex Card example using ha-evcc data. I tried to use it with this result. Do you have any idea what I am doing wrong?

[mpw96]

https://github.com/marq24/ha-evcc/releases/tag/2025.10.7
The format of the data that the hc-evcc gives us has changed (a breaking change) compared to the time when I've posted this. That means for the generators:

return [new Date(start["start"]).getTime()...
                 ^^^^^^^^^^^^^^
return [new Date(start["start_utc"]*1000).getTime()...
                 ^^^^^^^^^^^^^^^^^^^^^^^

You have to change this is several places.

[UDicke]

https://github.com/marq24/ha-evcc/releases/tag/2025.10.7

Ah, now I remember! 😊 Thank's for your detailed

return [new Date(start["start"]).getTime()...
                 ^^^^^^^^^^^^^^
return [new Date(start["start_utc"]*1000).getTime()...
                 ^^^^^^^^^^^^^^^^^^^^^^^

help!