Slice 4 of the Solar PV Recommendation Generator (ADR-0026).
`select_conservative_configs` turns Google's full solarPanelConfigs ladder
into up to five competing array configs for the Optimiser: drop north-facing
planes (within 30° of due north, wrap-aware), cap usable panels at ~70% of
maxArrayPanelsCount (imagery misses obstructions; MCS edge setback), collapse
rungs that trim to the same usable size keeping the higher-generation layout,
then sample five spanning min→max by expected generation. Returns () when
nothing usable remains.
Real London example → 5 rungs at 4/12/19/26/34 panels (all ≤34.3 = 70% of
49); synthetic cases pin the north-drop and the 70% cap.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Slice 3 of the Solar PV Recommendation Generator (ADR-0026). Per roof segment,
back-solve the effective overshading factor ZPV from Google's expected
generation against SAP's own unshaded annual output:
ZPV = (yearlyEnergyDcKwh × 0.955) / (0.8 × kWp × S)
reusing the calculator's Appendix U3.3 annual solar radiation S via a new
public seam `pv_annual_solar_radiation_kwh_per_m2`. Dividing Google's
generation by SAP's S cancels orientation/tilt and isolates shading; the
result snaps to the RdSAP bucket {1:1.0, 2:0.8, 3:0.5, 4:0.35} via the
ADR-0026 midpoint cutpoints (≥0.90→1, 0.65–0.90→2, 0.425–0.65→3, <0.425→4;
ZPV>1→1). The real London example's planes all back-solve to ZPV>1 → code 1.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
