diff --git a/custom_components/teslemetry/sensor.py b/custom_components/teslemetry/sensor.py
index 48b8cdf..e06e50f 100644
--- a/custom_components/teslemetry/sensor.py
+++ b/custom_components/teslemetry/sensor.py
@@ -1224,7 +1224,7 @@ def __init__(
     def _async_update_attrs(self) -> None:
         """Update the attributes of the sensor."""
         self._attr_available = not self.exactly(None)
-        self._attr_native_value = self.entity_description.value_fn(value)
+        self._attr_native_value = self.entity_description.value_fn(self._value)
 
 
 class TeslemetryWallConnectorSensorEntity(TeslemetryWallConnectorEntity, SensorEntity):