diff --git a/packages/control/consumer/consumer.py b/packages/control/consumer/consumer.py
index 0134bed4c3..fa5f5e0343 100644
--- a/packages/control/consumer/consumer.py
+++ b/packages/control/consumer/consumer.py
@@ -48,10 +48,12 @@ def update(self):
             if self.data.usage.type in NOT_CONTROLLED:
                 return
             else:
-                if self.data.get.voltages is None:
-                    self.data.get.voltages = [230 for i in range(0, self.data.config.connected_phases)]
-                if self.data.get.currents is None:
-                    self.data.get.currents = [0]*3
+                # Gegen den Default statt auf None prüfen, sonst bleibt ein Array mit der alten Phasenzahl stehen,
+                # wenn connected_phases nachträglich geändert wird (zB 3 auf 1 Phase).
+                if self.data.get.voltages == [230.0]*3:
+                    self.data.get.voltages = [230 if i < self.data.config.connected_phases else 0
+                                              for i in range(0, 3)]
+                if self.data.get.currents == [0.0]*3:
                     for i in range(0, self.data.config.connected_phases):
                         self.data.get.currents[i] = (self.data.get.power /
                                                      self.data.config.connected_phases /
diff --git a/packages/control/consumer/consumer_data.py b/packages/control/consumer/consumer_data.py
index 99aaefa9f4..482a1a7ce7 100644
--- a/packages/control/consumer/consumer_data.py
+++ b/packages/control/consumer/consumer_data.py
@@ -4,7 +4,7 @@
 from control.chargemode import Chargemode
 from control.chargepoint.control_parameter import ControlParameter, control_parameter_factory
 from control.consumer.usage import ConsumerUsage
-from dataclass_utils.factories import empty_list_factory, voltages_list_factory
+from dataclass_utils.factories import currents_list_factory, empty_list_factory, voltages_list_factory
 from helpermodules.abstract_plans import ScheduledPlanConsumer, TimeChargingPlanConsumer, TimepointPlan
 from helpermodules.constants import NO_ERROR
 from modules.common.consumer_setup import ConsumerSetup
@@ -63,7 +63,7 @@ class ConsumerConfig:
 @dataclass
 class Get:
     charge_state: bool = False
-    currents: Optional[List[Optional[float]]] = None
+    currents: List[float] = field(default_factory=currents_list_factory)
     daily_imported: float = field(default=0, metadata={"topic": "get/daily_imported"})
     error_timestamp: int = 0
     exported: float = 0
diff --git a/packages/control/consumer/consumer_test.py b/packages/control/consumer/consumer_test.py
index a871b55f38..e0f8b47c1b 100644
--- a/packages/control/consumer/consumer_test.py
+++ b/packages/control/consumer/consumer_test.py
@@ -590,3 +590,45 @@ def test_reset_chargemode_at_time(
     assert check_end_time_mock.call_count == expected_check_end_time_calls
     if expected_check_end_time_calls:
         check_end_time_mock.assert_called_once_with(consumer.data.usage.reset_chargemode)
+
+
+@pytest.mark.parametrize(
+    "connected_phases, previous_voltages, previous_currents, power, expected_voltages, expected_currents",
+    [
+        pytest.param(1, [230.0]*3, [0.0]*3, 0, [230, 0, 0], [0.0, 0.0, 0.0],
+                     id="noch beim Default (3 Phasen): Spannung wird auf 1 Phase neu berechnet"),
+        pytest.param(1, [230.0]*3, [0.0]*3, 230, [230, 0, 0], [1.0, 0.0, 0.0],
+                     id="Neuberechnung respektiert die tatsächliche Leistung"),
+        pytest.param(1, [230, 0, 0], [0.0, 1.0, 0.0], 0, [230, 0, 0], [0.0, 1.0, 0.0],
+                     id="bereits korrekt (nicht beim Default): keine Neuberechnung nötig, bleibt stabil"),
+    ],
+)
+def test_update_recalculates_voltages_and_currents_when_still_at_default(
+        consumer: Consumer,
+        connected_phases: int,
+        previous_voltages: List[float],
+        previous_currents: List[float],
+        power: float,
+        expected_voltages: List[float],
+        expected_currents: List[float],
+        monkeypatch):
+    """ Neuberechnung muss gegen den Default-Wert prüfen, nicht gegen None - sonst bleibt ein Array mit der alten
+    Phasenzahl stehen, wenn connected_phases nachträglich geändert wird (zB 3 auf 1 Phase). """
+    # setup
+    consumer.data.config.connected_phases = connected_phases
+    consumer.data.get.voltages = previous_voltages
+    consumer.data.get.currents = previous_currents
+    consumer.data.get.power = power
+    monkeypatch.setattr(consumer, "reset_chargemode_at_time", Mock())
+    monkeypatch.setattr(consumer, "is_switch_interval_elapsed", Mock())
+    monkeypatch.setattr(consumer, "get_parameter", Mock(return_value=(0, None, None, None)))
+    monkeypatch.setattr(consumer, "set_mode_changed", Mock())
+    monkeypatch.setattr(consumer, "set_control_parameter", Mock())
+    data.data.counter_all_data = Mock()
+
+    # execution
+    consumer.update()
+
+    # evaluation
+    assert consumer.data.get.voltages == expected_voltages
+    assert consumer.data.get.currents == expected_currents