Map surveyed PasHub PV arrays into the Appendix M photovoltaic_arrays input 🟩

_pashub_pv_arrays mirrors _elmhurst_pv_arrays, reusing its format-agnostic
pitch/orientation/overshading converters (PasHub lodges "South East"
space-separated; normalise to the octant map's hyphenated keys). Wired into
the SapEnergySource construction so the calculator's Appendix M generation
path sees measured PV instead of silently zero credit (issue #1590 bug 1).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

datatypes/epc/domain/mapper.py

@@ -153,6 +153,7 @@ from datatypes.epc.surveys.pashub_rdsap_site_notes import (
     FloorMeasurement,
     HeatingAndHotWater,
     PasHubRdSapSiteNotes,
+    Renewables as PasHubRenewables,
     RoofSpaceDetail,
     Ventilation,
     WaterUse,
@@ -367,6 +368,7 @@ class EpcPropertyDataMapper:
                 wind_turbines_terrain_type=general.terrain_type,
                 electricity_smart_meter_present=general.electricity_smart_meter,
                 pv_connection=renewables.pv_connection,
+                photovoltaic_arrays=_pashub_pv_arrays(renewables),
                 photovoltaic_supply=(
                     PhotovoltaicSupply(
                         none_or_no_details=PhotovoltaicSupplyNoneOrNoDetails(
@@ -6697,6 +6699,37 @@ _ELMHURST_PV_OVERSHADING_TO_RDSAP: Dict[str, int] = {
 }
 
 
+def _pashub_pv_arrays(
+    renewables: PasHubRenewables,
+) -> Optional[List[PhotovoltaicArray]]:
+    """Build the Appendix M cascade's input list from the PasHub Renewables
+    per-system PV block, mirroring `_elmhurst_pv_arrays` below and reusing its
+    format-agnostic converters. PasHub lodges the orientation space-separated
+    ("South East") where the shared octant map keys hyphenated ("South-East"),
+    so normalise before the lookup. Returns None when no per-array detail is
+    lodged — the PV-absent path the cascade already handles (issue #1590
+    bug 1: dropping this detail silently zeroed the PV credit)."""
+    if not renewables.pv_arrays:
+        return None
+    out: List[PhotovoltaicArray] = []
+    for arr in renewables.pv_arrays:
+        if arr.kwp is None or arr.kwp <= 0.0:
+            continue
+        out.append(
+            PhotovoltaicArray(
+                peak_power=arr.kwp,
+                pitch=_elmhurst_pv_pitch_code(
+                    arr.pitch_degrees if arr.pitch_degrees is not None else 30
+                ),
+                orientation=_elmhurst_orientation_int(
+                    (arr.orientation or "").replace(" ", "-")
+                ),
+                overshading=_elmhurst_pv_overshading_int(arr.overshading),
+            )
+        )
+    return out or None
+
+
 def _elmhurst_pv_arrays(
     renewables: ElmhurstRenewables,
 ) -> Optional[List[PhotovoltaicArray]]: