diff --git a/homeassistant/components/saj/sensor.py b/homeassistant/components/saj/sensor.py
index 12a5ae99570..866279af973 100644
--- a/homeassistant/components/saj/sensor.py
+++ b/homeassistant/components/saj/sensor.py
@@ -181,7 +181,12 @@ class SAJsensor(SensorEntity):
 
     _attr_should_poll = False
 
-    def __init__(self, serialnumber, pysaj_sensor, inverter_name=None):
+    def __init__(
+        self,
+        serialnumber: str | None,
+        pysaj_sensor: pysaj.Sensor,
+        inverter_name: str | None = None,
+    ) -> None:
         """Initialize the SAJ sensor."""
         self._sensor = pysaj_sensor
         self._inverter_name = inverter_name
@@ -193,38 +198,28 @@ class SAJsensor(SensorEntity):
         if pysaj_sensor.name == "total_yield":
             self._attr_state_class = SensorStateClass.TOTAL_INCREASING
 
-    @property
-    def name(self) -> str:
-        """Return the name of the sensor."""
+        self._attr_unique_id = f"{serialnumber}_{pysaj_sensor.name}"
+        native_uom = SAJ_UNIT_MAPPINGS[pysaj_sensor.unit]
+        self._attr_native_unit_of_measurement = native_uom
         if self._inverter_name:
-            return f"saj_{self._inverter_name}_{self._sensor.name}"
-
-        return f"saj_{self._sensor.name}"
+            self._attr_name = f"saj_{self._inverter_name}_{pysaj_sensor.name}"
+        else:
+            self._attr_name = f"saj_{pysaj_sensor.name}"
+        if native_uom == UnitOfPower.WATT:
+            self._attr_device_class = SensorDeviceClass.POWER
+        if native_uom == UnitOfEnergy.KILO_WATT_HOUR:
+            self._attr_device_class = SensorDeviceClass.ENERGY
+        if native_uom in (
+            UnitOfTemperature.CELSIUS,
+            UnitOfTemperature.FAHRENHEIT,
+        ):
+            self._attr_device_class = SensorDeviceClass.TEMPERATURE
 
     @property
     def native_value(self):
         """Return the state of the sensor."""
         return self._state
 
-    @property
-    def native_unit_of_measurement(self) -> str | None:
-        """Return the unit the value is expressed in."""
-        return SAJ_UNIT_MAPPINGS[self._sensor.unit]
-
-    @property
-    def device_class(self) -> SensorDeviceClass | None:
-        """Return the device class the sensor belongs to."""
-        if self.native_unit_of_measurement == UnitOfPower.WATT:
-            return SensorDeviceClass.POWER
-        if self.native_unit_of_measurement == UnitOfEnergy.KILO_WATT_HOUR:
-            return SensorDeviceClass.ENERGY
-        if self.native_unit_of_measurement in (
-            UnitOfTemperature.CELSIUS,
-            UnitOfTemperature.FAHRENHEIT,
-        ):
-            return SensorDeviceClass.TEMPERATURE
-        return None
-
     @property
     def per_day_basis(self) -> bool:
         """Return if the sensors value is on daily basis or not."""
@@ -255,8 +250,3 @@ class SAJsensor(SensorEntity):
 
         if update:
             self.async_write_ha_state()
-
-    @property
-    def unique_id(self) -> str:
-        """Return a unique identifier for this sensor."""
-        return f"{self._serialnumber}_{self._sensor.name}"