fix spravneho prodeje do site

backend/tests/test_planning_dispatch_milp.py

@@ -2239,7 +2239,7 @@ class ChargeAcquisitionArbitrageTests(unittest.TestCase):
             50.0,
             operating_mode="AUTO",
         )
-        self.assertEqual(snap["planner_build_tag"], "2026-05-28-evening-peak-full-export-v27")
+        self.assertEqual(snap["planner_build_tag"], "2026-05-28-evening-peak-full-export-v28")
         peak_idx = sells.index(4.04)
         peak = results[peak_idx]
         self.assertIn(peak.export_mode, ("BATTERY_SELL", "PV_SURPLUS"))
@@ -2254,6 +2254,50 @@ class ChargeAcquisitionArbitrageTests(unittest.TestCase):
                 msg=f"slot {i} sell={sells[i]} must not battery-export before first push",
             )
 
+    def test_evening_push_export_near_site_cap_home01(self) -> None:
+        """home-01 večer: export ≈ min(13.5 kW, 18 kW − load), ne (max−load)/2."""
+        prague = ZoneInfo("Europe/Prague")
+        base = datetime(2026, 5, 25, 18, 45, tzinfo=prague)
+        slots = [
+            PlanningSlot(
+                interval_start=base,
+                buy_price=7.3,
+                sell_price=4.4,
+                pv_a_forecast_w=0,
+                pv_b_forecast_w=0,
+                load_baseline_w=1797,
+                ev1_connected=False,
+                ev2_connected=False,
+                allow_charge=False,
+                allow_discharge_export=True,
+                charge_acquisition_buy_czk_kwh=0.8,
+            )
+        ]
+        battery = _battery(uc_wh=64_000.0, terminal_soc_value_factor=0.0)
+        battery.max_discharge_power_w = 18_000
+        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=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, _ms, snap = solve_dispatch(
+            slots,
+            battery,
+            hp,
+            grid,
+            [None, None],
+            vehicles,
+            0.9 * battery.soc_max_wh,
+            50.0,
+            operating_mode="AUTO",
+        )
+        self.assertEqual(snap["planner_build_tag"], "2026-05-28-evening-peak-full-export-v28")
+        r = results[0]
+        self.assertEqual(r.export_mode, "BATTERY_SELL")
+        self.assertGreaterEqual(abs(r.grid_setpoint_w), 12_500)
+        self.assertLessEqual(abs(r.grid_setpoint_w), 13_500)
+
     def test_evening_battery_export_when_sell_above_acquisition(self) -> None:
         base = datetime(2026, 5, 21, 10, 0, tzinfo=timezone.utc)
         cheap = (0.75, 0.25)