diff --git a/packages/modules/devices/sma/sma_sunny_island/bat.py b/packages/modules/devices/sma/sma_sunny_island/bat.py
index 7d866b303d..0514c915dd 100644
--- a/packages/modules/devices/sma/sma_sunny_island/bat.py
+++ b/packages/modules/devices/sma/sma_sunny_island/bat.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python3
-from typing import TypedDict, Any
+from typing import TypedDict, Any, Optional
+import logging
 
 from modules.common import modbus
 from modules.common.abstract_device import AbstractBat
@@ -12,6 +13,8 @@
 from modules.common.utils.peak_filter import PeakFilter
 from modules.common.component_type import ComponentType
 
+log = logging.getLogger(__name__)
+
 
 class KwargsDict(TypedDict):
     client: modbus.ModbusTcpClient_
@@ -27,8 +30,9 @@ def initialize(self) -> None:
         self.store = get_bat_value_store(self.component_config.id)
         self.fault_state = FaultState(ComponentInfo.from_component_config(self.component_config))
         self.peak_filter = PeakFilter(ComponentType.BAT, self.component_config.id, self.fault_state)
+        self.last_mode = 'Undefined'
 
-    def read(self) -> BatState:
+    def update(self) -> None:
         unit = self.component_config.configuration.modbus_id
 
         with self.__tcp_client:
@@ -38,15 +42,34 @@ def read(self) -> BatState:
             imported, exported = self.__tcp_client.read_holding_registers(30595, [ModbusDataType.INT_32]*2, unit=unit)
 
         imported, exported = self.peak_filter.check_values(power, imported, exported)
-        return BatState(
+        bat_state = BatState(
             power=power,
             soc=soc,
             imported=imported,
             exported=exported
         )
+        self.store.set(bat_state)
 
-    def update(self) -> None:
-        self.store.set(self.read())
+    def set_power_limit(self, power_limit: Optional[int]) -> None:
+        unit = self.component_config.configuration.modbus_id
+
+        if power_limit is None:
+            if self.last_mode is not None:
+                # Kein Powerlimit gefordert, externe Steuerung war aktiv, externe Steuerung deaktivieren
+                self.__tcp_client.write_register(40151, 803, data_type=ModbusDataType.UINT_32, unit=unit)
+                self.__tcp_client.write_register(40149, 0, data_type=ModbusDataType.INT_32, unit=unit)
+                log.debug("Keine Batteriesteuerung gefordert, deaktiviere externe Steuerung.")
+                self.last_mode = None
+        else:
+            # Powerlimit gefordert, externe Steuerung aktivieren, Limit setzen
+            self.__tcp_client.write_register(40151, 802, data_type=ModbusDataType.UINT_32, unit=unit)
+            power_value = int(power_limit) * -1
+            self.__tcp_client.write_register(40149, power_value, data_type=ModbusDataType.INT_32, unit=unit)
+            log.debug("Aktive Batteriesteuerung vorhanden. Setze externe Steuerung. Leistung: {power_value}")
+            self.last_mode = 'limited'
+
+    def power_limit_controllable(self) -> bool:
+        return True
 
 
 component_descriptor = ComponentDescriptor(configuration_factory=SmaSunnyIslandBatSetup)