Uses hourly PV forecast data (watts per hour from forecast.solar) to
find the first contiguous block of hours where:
PV production - base_load_w >= min_surplus_w
Shows a blue advice card on the status page:
"Auto einstecken bis HH:MM Uhr"
"Erwartetes Überschuss-Fenster: HH:MM – HH:MM Uhr"
Card is hidden when:
- No surplus window found (weak forecast day)
- Window has already started or passed
- A wallbox is currently active (car already charging)
Config: forecast.base_load_w (1000W), forecast.min_surplus_w (1800W)
Timestamp parsing handles both "HH:MM:SS" and "HH:MM" key formats.
Today: surplus window 11:00–13:00 (24.3 kWh forecast).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Lutz Finsterle
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