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perf: cache AC charge break-even prices

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Andreas
2026-07-14 17:54:15 +02:00
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docs/akkudoktoreos/prediction.md
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@@ -208,21 +208,59 @@ data and rely on file/JSON imports only for initial setup.
Prediction keys:
- `feed_in_tarif_wh`: Feed in tarif per Wh (€/Wh).
- `feed_in_tarif_kwh`: Feed in tarif per kWh (€/kWh)
- `feed_in_tariff_wh`: Feed-in tariff per Wh (€/Wh).
- `feed_in_tariff_kwh`: Feed-in tariff per kWh (€/kWh).
Configuration options:
- `feedintarif`: Feed in tariff configuration.
- `feedintariff`: Feed-in tariff configuration.
- `provider`: Feed in tariff provider id of provider to be used.
- `FeedInTariffFixed`: Provides fixed feed in tariff values.
- `FeedInTariffEnergyCharts`: Retrieves Energy-Charts day-ahead market prices and extends
them to the configured prediction horizon when necessary.
- `FeedInTariffImport`: Imports from a file or JSON string or by endpoint data provision.
- `provider_settings.feed_in_tariff_kwh`: Fixed feed in tariff (€/kWh).
- `provider_settings.import_file_path`: Path to the file to import feed in tariff forecast data from.
- `provider_settings.import_json`: JSON string, dictionary of feed in tariff value lists.
- `provider_settings.FeedInTariffFixed.feed_in_tariff_kwh`: Fixed feed-in tariff (€/kWh).
- `provider_settings.FeedInTariffEnergyCharts.bidding_zone`: Energy-Charts bidding zone.
- `provider_settings.FeedInTariffImport.import_file_path`: Path to the file containing imported
feed-in tariff prediction data.
- `provider_settings.FeedInTariffImport.import_json`: JSON string containing feed-in tariff
prediction data.
### FeedInTariffEnergyCharts Provider
The `FeedInTariffEnergyCharts` provider uses the raw Energy-Charts day-ahead market price as the
feed-in tariff. It stores prices in `feed_in_tariff_wh` without adding electricity import charges
or VAT. The native Energy-Charts resolution, including quarter-hour data, is retained.
Energy-Charts usually supplies prices only for the published day-ahead period. If that data does
not cover the complete configured prediction horizon, the provider extends it as follows:
- With more than 800 hours of history, an ETS (Holt-Winters exponential smoothing) forecast with
weekly seasonality is used.
- With more than 168 hours of history, an ETS forecast with daily seasonality is used.
- With less history, the median of the available values is used as a constant fallback.
The seasonal periods are adjusted to the source resolution. For example, quarter-hour data uses
four values per hour. Values already supplied by Energy-Charts are kept unchanged; only missing
future slots after the last published price are forecast.
Example configuration:
```json
{
"feedintariff": {
"provider": "FeedInTariffEnergyCharts",
"provider_settings": {
"FeedInTariffEnergyCharts": {
"bidding_zone": "DE-LU"
}
}
}
}
```
### FeedInTariffImport Provider