implementace load first

backend/tests/test_planning_dispatch_milp.py

@@ -1720,5 +1720,67 @@ class Home01RegressionTests(unittest.TestCase):
             self.assertNotEqual(results[i].export_mode, "PV_SURPLUS")
 
 
+class LoadFirstDispatchTests(unittest.TestCase):
+    """Deye load-first: PV do spotřeby dřív než bc_pv/ge_pv z přebytku."""
+
+    @staticmethod
+    def _solve_auto(
+        slots: list[PlanningSlot],
+        battery: SimpleNamespace,
+        soc0: float,
+    ) -> list[DispatchResult]:
+        hp = SimpleNamespace(rated_heating_power_w=0, tuv_min_temp_c=45.0, tuv_target_temp_c=55.0)
+        grid = SimpleNamespace(max_import_power_w=20_000, max_export_power_w=20_000)
+        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,
+            soc0,
+            50.0,
+            operating_mode="AUTO",
+        )
+        return results
+
+    def test_high_pv_low_load_prefers_export_over_battery_charge(self) -> None:
+        """Mimo grid-charge masku nesmí LP nabíjet z celého PV při malé zátěži."""
+        base = datetime(2026, 5, 21, 12, 0, tzinfo=timezone.utc)
+        slots = [
+            PlanningSlot(
+                interval_start=base,
+                buy_price=2.0,
+                sell_price=4.0,
+                pv_a_forecast_w=8000,
+                pv_b_forecast_w=0,
+                load_baseline_w=500,
+                ev1_connected=False,
+                ev2_connected=False,
+                is_predicted_price=False,
+                allow_charge=False,
+                allow_discharge_export=False,
+            )
+        ]
+        battery = _battery(uc_wh=50_000.0)
+        soc0 = 0.5 * battery.usable_capacity_wh
+        r = self._solve_auto(slots, battery, soc0)[0]
+        self.assertLessEqual(
+            r.battery_setpoint_w,
+            200,
+            msg="load-first: přebytek FVE má jít do exportu, ne do bc_pv",
+        )
+        self.assertLess(
+            r.grid_setpoint_w,
+            -400,
+            msg="očekáván PV export (přebytek po load-first)",
+        )
+        self.assertEqual(r.export_mode, "PV_SURPLUS")
+
+
 if __name__ == "__main__":
     unittest.main()