fix infeasable

backend/tests/test_planning_dispatch_milp.py

@@ -1192,6 +1192,57 @@ class AutoPassiveSelfConsumptionTests(unittest.TestCase):
         self.assertLessEqual(results[0].grid_setpoint_w, 0)
         self.assertLess(results[0].battery_setpoint_w, -100)
 
+    def test_expensive_slot_uses_hp_variable_not_rated(self) -> None:
+        """Regrese: bd+pv_ld >= load+hp[t], ne load+hp_rated (jinak Infeasible bez PV)."""
+        slots = [
+            PlanningSlot(
+                interval_start=datetime(2026, 5, 22, 20, 0, tzinfo=timezone.utc),
+                buy_price=3.0,
+                sell_price=2.0,
+                pv_a_forecast_w=0,
+                pv_b_forecast_w=0,
+                load_baseline_w=1961,
+                ev1_connected=False,
+                ev2_connected=False,
+                allow_charge=False,
+                allow_discharge_export=False,
+                charge_acquisition_buy_czk_kwh=0.52,
+            ),
+            PlanningSlot(
+                interval_start=datetime(2026, 5, 22, 20, 15, tzinfo=timezone.utc),
+                buy_price=-5.0,
+                sell_price=2.0,
+                pv_a_forecast_w=0,
+                pv_b_forecast_w=0,
+                load_baseline_w=1961,
+                ev1_connected=False,
+                ev2_connected=False,
+                allow_charge=False,
+                allow_discharge_export=False,
+                charge_acquisition_buy_czk_kwh=0.52,
+            ),
+        ]
+        battery = _battery(uc_wh=64_000.0, min_pct=12.0, arb_pct=20.0)
+        battery.planner_terminal_soc_value_factor = 0.0
+        hp = SimpleNamespace(rated_heating_power_w=3500, tuv_min_temp_c=45.0, tuv_target_temp_c=55.0)
+        grid = SimpleNamespace(max_import_power_w=17_000, max_export_power_w=13_500)
+        vehicles = [
+            SimpleNamespace(max_charge_power_w=0, battery_capacity_kwh=1.0, default_target_soc_pct=80.0),
+            SimpleNamespace(max_charge_power_w=0, battery_capacity_kwh=1.0, default_target_soc_pct=80.0),
+        ]
+        results, _, _ = solve_dispatch(
+            slots,
+            battery,
+            hp,
+            grid,
+            [None, None],
+            vehicles,
+            20_000.0,
+            50.0,
+            operating_mode="AUTO",
+        )
+        self.assertEqual(len(results), 2)
+
 
 class AutoPassiveNoLoadFollowingDischargeTests(unittest.TestCase):
     """AUTO bez allow_discharge_export: žádný export do sítě (Deye PASSIVE)."""