add inverter size to forecast.solar

[JabeBRD]

To make solar forecast in forecast.solar more accurate, it is possible to use inverter parameter in API call, could this be added to evcc configuration of forecast.solar?

Type: float, > 0

With this parameter, you can Forecast.Solar tell what is the maximal power of your inverter in kilowatts or kVA.

https://api.forecast.solar/...?inverter=...
If your inverter is (very) undersized, the maximum prediction power will be limited to this value.```

[andig]

What account level is this available for? I'm wondering if we can just handle this on the evcc side across forecasts adding

maxacpower: <Watts>

and cap the forecast by that.

Actually it's a bit more complicated. You might still (Hybrid inverters) feed that excess DC into the battery. So, it depends if forecast should really be capped at all.

/cc @premultiply

[JabeBRD]

Im not 100% sure, but i have forecast.solar integration in Home Assistant and im using free account, it has this option and im using it.
See here, query parameters https://doc.forecast.solar/api

[thecem]

For open-meteo this is in place since the calculation is on our side. For forcast.solar it could be an option for that parameter, to handle this via the forecast.solar api. to handle that via evcc, this would be more complicateted. In my first PR for the open-meteo there was an array option to sum up the generator power to one inverter limitation (e.g.: 2 MPPT´s with 4000 east and 6000 west on a 5000 inverter.

[thecem]

#19471