diff --git a/homeassistant/components/fronius/sensor.py b/homeassistant/components/fronius/sensor.py
index 53342864da7..670551ca7c5 100644
--- a/homeassistant/components/fronius/sensor.py
+++ b/homeassistant/components/fronius/sensor.py
@@ -333,24 +333,28 @@ METER_ENTITY_DESCRIPTIONS: list[SensorEntityDescription] = [
     SensorEntityDescription(
         key="power_factor_phase_1",
         name="Power factor phase 1",
+        device_class=SensorDeviceClass.POWER_FACTOR,
         state_class=SensorStateClass.MEASUREMENT,
         entity_registry_enabled_default=False,
     ),
     SensorEntityDescription(
         key="power_factor_phase_2",
         name="Power factor phase 2",
+        device_class=SensorDeviceClass.POWER_FACTOR,
         state_class=SensorStateClass.MEASUREMENT,
         entity_registry_enabled_default=False,
     ),
     SensorEntityDescription(
         key="power_factor_phase_3",
         name="Power factor phase 3",
+        device_class=SensorDeviceClass.POWER_FACTOR,
         state_class=SensorStateClass.MEASUREMENT,
         entity_registry_enabled_default=False,
     ),
     SensorEntityDescription(
         key="power_factor",
         name="Power factor",
+        device_class=SensorDeviceClass.POWER_FACTOR,
         state_class=SensorStateClass.MEASUREMENT,
     ),
     SensorEntityDescription(