Could we simplify and shorten the wording? It would be great to simply show (+/- X%) rather than "forecast is....". Imho makes it easier to read, too.

It would still be nice to see the actual forecasted value for current time, or maybe a Y axis. We show energy, so why not power?

Could we simplify and shorten the wording? It would be great to simply show (+/- X%) rather than "forecast is....". Imho makes it easier to read, too.

I opted to go the explicit way because with +/- x% it is not always clear what this means. I'm open to better and more concise wording suggestions, but just showing the number is not enough.

Together with the option titled "adjust" imho +/- percent value is clear as to what it does.

@andig please make suggestions with the complete wording and the individual scenarios (including no diff)

• Adjust solar forecast based on real production data (+12%).
• Adjust solar forecast based on real production data (-5%).
• Adjust solar forecast based on real production data.

What about the "Not enough data case"? Omit?

• Adjust solar forecast based on real production data (+12%).

Adjust solar forecast by +12% based on real production data.

I would appreciate the number clearly and easily recognizable, that is at the end of the line. The „not enough data“ case can just omit it, same as today.

Adjust solar forecast based on real production data (+12%).
Adjust solar forecast based on real production data (-5%).
Adjust solar forecast based on real production data.

Switched to this notation.

Lässt sich das auch auf gerade Zahlen runden, also statt 1.291% auf 1%?
Die Nachkommastellen sind meiner Meinung nach nicht mehr ausschlaggebend.

@Maschga Der letzte Screenshot ist ein super schlechtes Datenbeispiel. Hier wird in der Tat um +1291% angepasst. Das ist kein Komma sondern der deutsche Tausendertrenner :D
Die Prozentwerte werden auf gerade % gerundet.

@naltatis - some feedback on this feature - for some reason (adjustment too aggressive?) sometimes I see correction that is way too large, such as -103%, even -185%
It should never reach a -100% compensation, in my opinion, unless PV size is misconfigured. (Mine is OK)

Can you share a debug log for this?

Unable to provide logs at this time since I have restarted evcc and UI logs are gone.
Please ignore this issue for now, I will investigate further in the next few days and will update here.

I have a suspicion at this time that problem is due to my system wiring - (there is a constant load of 1kW temporarily (for two weeks) connected in such a way, that for example during the night I get a orange warning that my PV generation sign is negative)

Yes, as always - everything is clear in the log !

Last few days were cloudy, not much sun, and my temporary 1kW "vampire drain" was the culprit, generating significant "negative solar generation" during the nights..

Mar 19 04:59:14 picharger evcc[8357]: [site  ] DEBUG 2025/03/19 04:59:14 pv 1 power: -1016W
Mar 19 04:59:14 picharger evcc[8357]: [site  ] WARN 2025/03/19 04:59:14 pv 1 power: -1016W is negative - check configuration if sign is correct
Mar 19 04:59:16 picharger evcc[8357]: [site  ] DEBUG 2025/03/19 04:59:16 solar forecast: accumulated 0.000kWh, produced -9.229kWh, scale -68401.375

Mar 20 05:42:33 picharger evcc[8357]: [site  ] DEBUG 2025/03/20 05:42:33 pv 1 power: -1005W
Mar 20 05:42:33 picharger evcc[8357]: [site  ] WARN 2025/03/20 05:42:33 pv 1 power: -1005W is negative - check configuration if sign is correct
Mar 20 05:42:35 picharger evcc[8357]: [site  ] DEBUG 2025/03/20 05:42:35 solar forecast: accumulated 31.198kWh, produced -9.015kWh, scale -0.289

I am sure everything will be correct when this vampire drain will be disconnected.

Your config is broken as the warning indicates. Please resolve warnings before opening issues.