Fix Kostal dc_power (openWB#2618)

* Fix dc_power if not availble

* flake8

* dc_power = none instead 0f 0

Co-authored-by: LKuemmel <76958050+LKuemmel@users.noreply.github.com>

* Improve fault_handling with Text

* flake8

* typo

---------

Co-authored-by: LKuemmel <76958050+LKuemmel@users.noreply.github.com>

Author: seaspotter

packages/modules/devices/kostal/kostal_plenticore/inverter.py

@@ -32,14 +32,24 @@ def initialize(self) -> None:
         self.store = get_inverter_value_store(self.component_config.id)
         self.fault_state = FaultState(ComponentInfo.from_component_config(self.component_config))
         self.sim_counter = SimCounter(self.kwargs['device_id'], self.component_config.id, prefix="Wechselrichter")
+        self.fault_text = (
+            "Es kann keine DC-Leistung aus dem Wechselrichter ausgelesen werden, "
+            "möglicherweise kann ein Firmware-Update für den Wechselrichter nötig sein."
+        )
 
     def update(self) -> None:
         power = self.client.read_holding_registers(
             575, ModbusDataType.INT_16, unit=self.modbus_id, wordorder=self.endianess) * -1
         exported = self.client.read_holding_registers(
             320, ModbusDataType.FLOAT_32, unit=self.modbus_id, wordorder=self.endianess)
-        dc_power = self.client.read_holding_registers(
-            1066, ModbusDataType.FLOAT_32, unit=self.modbus_id, wordorder=self.endianess) * -1
+        # Try to read dc_power, if it fails just skip it and set to None
+        try:
+            dc_power = self.client.read_holding_registers(
+                1066, ModbusDataType.FLOAT_32, unit=self.modbus_id, wordorder=self.endianess) * -1
+            self.fault_state.no_error()
+        except Exception:
+            dc_power = None
+            self.fault_state.no_error(self.fault_text)
         imported, _ = self.sim_counter.sim_count(power)
 
         inverter_state = InverterState(