diff --git a/victron_ble/devices/base.py b/victron_ble/devices/base.py
index 1b58e2e..a6dec6f 100644
--- a/victron_ble/devices/base.py
+++ b/victron_ble/devices/base.py
@@ -2,7 +2,7 @@
 import struct
 from dataclasses import dataclass
 from enum import Enum
-from typing import Any, Dict, Type
+from typing import Any, Dict, Type, TypeVar
 
 from Crypto.Cipher import AES
 from Crypto.Util import Counter
@@ -10,6 +10,19 @@
 
 from victron_ble.exceptions import AdvertisementKeyMismatchError
 
+E = TypeVar("E", bound=Enum)
+
+
+def parse_enum(enum_class: Type[E], value: int) -> E:
+    """
+    Safely convert an int to an enum, returning the UNKNOWN member if the value is not valid.
+    The enum_class must have an UNKNOWN member defined.
+    """
+    try:
+        return enum_class(value)
+    except ValueError:
+        return getattr(enum_class, "UNKNOWN")
+
 
 # Sourced from VE.Direct docs
 class OperationMode(Enum):
@@ -171,6 +184,7 @@ class ChargerError(Enum):
 
 
 class OffReason(Enum):
+    UNKNOWN = -1
     NO_REASON = 0x00000000
     NO_INPUT_POWER = 0x00000001
     SWITCHED_OFF_SWITCH = 0x00000002
@@ -186,6 +200,7 @@ class OffReason(Enum):
 
 
 class AlarmReason(Enum):
+    UNKNOWN = -1
     NO_ALARM = 0
     LOW_VOLTAGE = 1
     HIGH_VOLTAGE = 2
diff --git a/victron_ble/devices/battery_monitor.py b/victron_ble/devices/battery_monitor.py
index 6c34ea6..f91cd08 100644
--- a/victron_ble/devices/battery_monitor.py
+++ b/victron_ble/devices/battery_monitor.py
@@ -7,6 +7,7 @@
     Device,
     DeviceData,
     kelvin_to_celsius,
+    parse_enum,
 )
 
 
@@ -107,7 +108,7 @@ def parse_decrypted(self, decrypted: bytes) -> dict:
         parsed = {
             "remaining_mins": remaining_mins if remaining_mins != 0xFFFF else None,
             "voltage": voltage / 100 if voltage != 0x7FFF else None,
-            "alarm": AlarmReason(alarm),
+            "alarm": parse_enum(AlarmReason, alarm),
             "aux_mode": AuxMode(aux_mode),
             "current": current / 1000 if current != 0x3FFFFF else None,
             "consumed_ah": -consumed_ah / 10 if consumed_ah != 0xFFFFF else None,
diff --git a/victron_ble/devices/dc_energy_meter.py b/victron_ble/devices/dc_energy_meter.py
index abd2c09..24bb5b1 100644
--- a/victron_ble/devices/dc_energy_meter.py
+++ b/victron_ble/devices/dc_energy_meter.py
@@ -7,6 +7,7 @@
     Device,
     DeviceData,
     kelvin_to_celsius,
+    parse_enum,
 )
 from victron_ble.devices.battery_monitor import AuxMode
 
@@ -54,7 +55,8 @@ def get_alarm(self) -> Optional[AlarmReason]:
         """
         Return an enum indicating the current alarm reason or None otherwise
         """
-        return AlarmReason(self._data["alarm"]) if self._data["alarm"] > 0 else None
+        alarm = self._data["alarm"]
+        return parse_enum(AlarmReason, alarm) if alarm > 0 else None
 
     def get_aux_mode(self) -> AuxMode:
         """
diff --git a/victron_ble/devices/dcdc_converter.py b/victron_ble/devices/dcdc_converter.py
index 82d9db8..a79c251 100644
--- a/victron_ble/devices/dcdc_converter.py
+++ b/victron_ble/devices/dcdc_converter.py
@@ -7,6 +7,7 @@
     DeviceData,
     OffReason,
     OperationMode,
+    parse_enum,
 )
 
 
@@ -73,5 +74,5 @@ def parse_decrypted(self, decrypted: bytes) -> dict:
             "output_voltage": (
                 output_voltage / 100 if output_voltage != 0x7FFF else None
             ),
-            "off_reason": OffReason(off_reason),
+            "off_reason": parse_enum(OffReason, off_reason),
         }
diff --git a/victron_ble/devices/orion_xs.py b/victron_ble/devices/orion_xs.py
index 0e12e1a..dd70841 100644
--- a/victron_ble/devices/orion_xs.py
+++ b/victron_ble/devices/orion_xs.py
@@ -7,6 +7,7 @@
     DeviceData,
     OffReason,
     OperationMode,
+    parse_enum,
 )
 
 
@@ -94,5 +95,5 @@ def parse_decrypted(self, decrypted: bytes) -> dict:
             "output_current": output_current / 10 if output_current != 0xFFFF else None,
             "input_voltage": input_voltage / 100 if input_voltage != 0xFFFF else None,
             "input_current": input_current / 10 if input_current != 0xFFFF else None,
-            "off_reason": OffReason(off_reason),
+            "off_reason": parse_enum(OffReason, off_reason),
         }
diff --git a/victron_ble/devices/smart_battery_protect.py b/victron_ble/devices/smart_battery_protect.py
index 1b8f2e6..3079603 100644
--- a/victron_ble/devices/smart_battery_protect.py
+++ b/victron_ble/devices/smart_battery_protect.py
@@ -9,6 +9,7 @@
     DeviceData,
     OffReason,
     OperationMode,
+    parse_enum,
 )
 
 
@@ -91,11 +92,11 @@ def parse_decrypted(self, decrypted: bytes) -> dict:
                 OutputState(output_state) if output_state != 0xFF else None
             ),
             "error_code": (ChargerError(error_code) if error_code != 0xFF else None),
-            "alarm_reason": AlarmReason(alarm_reason),
-            "warning_reason": AlarmReason(warning_reason),
+            "alarm_reason": parse_enum(AlarmReason, alarm_reason),
+            "warning_reason": parse_enum(AlarmReason, warning_reason),
             "input_voltage": (input_voltage / 100 if input_voltage != 0x7FFF else None),
             "output_voltage": (
                 output_voltage / 100 if output_voltage != 0xFFFF else None
             ),
-            "off_reason": OffReason(off_reason),
+            "off_reason": parse_enum(OffReason, off_reason),
         }