diff --git a/datatypes/epc/domain/tests/test_from_sap_schema.py b/datatypes/epc/domain/tests/test_from_sap_schema.py
index de23ded0..574a1a61 100644
--- a/datatypes/epc/domain/tests/test_from_sap_schema.py
+++ b/datatypes/epc/domain/tests/test_from_sap_schema.py
@@ -137,6 +137,24 @@ class TestFromSapSchema17_1RebaselineFields:
         assert result.assessment_type == "SAP"
 
 
+class TestFullSapPhotovoltaics:
+    """Full-SAP certs lodge measured PV under `sap_energy_source.pv_arrays`;
+    the mapper must carry it to the domain `photovoltaic_arrays` so the
+    Appendix-M generation credit isn't silently dropped."""
+
+    def test_maps_the_lodged_pv_array(self) -> None:
+        # sap_17_1_house.json lodges one 1.62 kWp array (pitch 3, orientation 6,
+        # overshading 1).
+        schema = from_dict(SapSchema17_1, load("sap_17_1_house.json"))
+
+        result = EpcPropertyDataMapper.from_sap_schema_17_1(schema)
+
+        arrays = result.sap_energy_source.photovoltaic_arrays
+        assert arrays is not None
+        assert len(arrays) == 1
+        assert arrays[0].peak_power == 1.62
+
+
 class TestFullSapElectricityTariffTranslation:
     """The full-SAP `energy_tariff` code space differs from the RdSAP
     `meter_type` one the calculator reads, so the mapper must translate it."""
diff --git a/datatypes/epc/schema/sap_schema_17_1.py b/datatypes/epc/schema/sap_schema_17_1.py
index 5cad983c..e4f41d9e 100644
--- a/datatypes/epc/schema/sap_schema_17_1.py
+++ b/datatypes/epc/schema/sap_schema_17_1.py
@@ -107,6 +107,20 @@ class SapVentilation:
     mechanical_vent_duct_type: Optional[int] = None
 
 
+@dataclass
+class SapPvArray:
+    """One measured photovoltaic array lodged on a full-SAP cert (under
+    `sap_energy_source.pv_arrays`): peak power (kWp), pitch, SAP octant
+    orientation (1-8), overshading code, and the connection type. Mirrors the
+    domain `PhotovoltaicArray` the calculator's Appendix M generation uses."""
+
+    peak_power: Optional[float] = None
+    pitch: Optional[int] = None
+    orientation: Optional[int] = None
+    overshading: Optional[int] = None
+    pv_connection: Optional[int] = None
+
+
 @dataclass
 class SapEnergySource:
     """Electricity tariff, on-site generation and lighting. Lighting outlet
@@ -118,6 +132,7 @@ class SapEnergySource:
     wind_turbine_terrain_type: Optional[int] = None
     fixed_lighting_outlets_count: Optional[int] = None
     low_energy_fixed_lighting_outlets_count: Optional[int] = None
+    pv_arrays: Optional[List[SapPvArray]] = None
 
 
 @dataclass