diff --git a/backend/documents_parser/tests/test_extractor.py b/backend/documents_parser/tests/test_extractor.py
index 438c8a74d..947c6e44d 100644
--- a/backend/documents_parser/tests/test_extractor.py
+++ b/backend/documents_parser/tests/test_extractor.py
@@ -21,6 +21,7 @@ from datatypes.epc.surveys.pashub_rdsap_site_notes import (
     MainBuildingConstruction,
     MainBuildingMeasurements,
     MainHeating,
+    PvArrayDetail,
     Renewables,
     RoomCountElements,
     RoofSpace,
@@ -646,6 +647,64 @@ class TestRenewablesPvConnection:
         assert renewables.percent_roof_covered_pv == 45
 
 
+class TestRenewablesPvArrays:
+    """When "Photovoltaic array kWp Known?" is Yes, the survey lodges a
+    per-system block ("Number of PV systems?", then "PV {n}: kWp value /
+    Photovoltaic Pitch / Orientation / Overshading") instead of the
+    percent-roof estimate. The extractor must capture it — dropped detail
+    silently zeroes the Appendix M PV credit (issue #1590 bug 1; verbatim
+    lines from accuracy fixture deal 507639151843).
+    """
+
+    # The real kWp-known block, verbatim from the 507639151843 site notes.
+    _KWP_KNOWN_BLOCK = [
+        "Photovoltaic array kWp Known?",
+        "Yes",
+        "Number of PV systems?",
+        "1",
+        "PV 1: kWp value:",
+        "2.43 kWp",
+        "PV 1: Photovoltaic Pitch?",
+        "30 Degrees",
+        "PV 1: Photovoltaic Orientation?",
+        "South East",
+        "PV 1: Photovoltaic Overshading:",
+        "None or very little",
+    ]
+
+    @pytest.fixture
+    def renewables(self) -> Renewables:
+        # Arrange — fixture 3's Renewables section with its "kWp Known? No +
+        # percent roof" block swapped for the real kWp-known block.
+        lines = load_text_fixture_3()
+        start = lines.index("Photovoltaic array kWp Known?")
+        end = lines.index("Number of PV batteries:")
+        spliced = lines[:start] + self._KWP_KNOWN_BLOCK + lines[end:]
+        return PasHubRdSapSiteNotesExtractor(spliced).extract_renewables()
+
+    def test_pv_array_detail_is_captured(self, renewables: Renewables) -> None:
+        assert renewables.pv_arrays == [
+            PvArrayDetail(
+                kwp=2.43,
+                pitch_degrees=30,
+                orientation="South East",
+                overshading="None or very little",
+            )
+        ]
+
+    def test_pv_diverter_is_captured(self, renewables: Renewables) -> None:
+        assert renewables.pv_diverter_present is False  # fixture 3 lodges "No"
+
+    def test_no_pv_block_leaves_arrays_absent(self) -> None:
+        # Arrange / Act — fixture 3 as lodged (kWp Known? No, percent path).
+        renewables = PasHubRdSapSiteNotesExtractor(
+            load_text_fixture_3()
+        ).extract_renewables()
+
+        # Assert
+        assert renewables.pv_arrays is None
+
+
 class TestRoomCountElements:
     @pytest.fixture
     def rce(self) -> RoomCountElements: