diff --git a/homeassistant/components/apcupsd/coordinator.py b/homeassistant/components/apcupsd/coordinator.py
index 321da56095a..ae4c94a9382 100644
--- a/homeassistant/components/apcupsd/coordinator.py
+++ b/homeassistant/components/apcupsd/coordinator.py
@@ -9,6 +9,7 @@ from typing import Final
 
 from apcaccess import status
 
+from homeassistant.config_entries import ConfigEntry
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.debounce import Debouncer
 from homeassistant.helpers.device_registry import DeviceInfo
@@ -32,6 +33,8 @@ class APCUPSdCoordinator(DataUpdateCoordinator[OrderedDict[str, str]]):
     updates from the server.
     """
 
+    config_entry: ConfigEntry
+
     def __init__(self, hass: HomeAssistant, host: str, port: int) -> None:
         """Initialize the data object."""
         super().__init__(
@@ -70,13 +73,10 @@ class APCUPSdCoordinator(DataUpdateCoordinator[OrderedDict[str, str]]):
         return self.data.get("SERIALNO")
 
     @property
-    def device_info(self) -> DeviceInfo | None:
+    def device_info(self) -> DeviceInfo:
         """Return the DeviceInfo of this APC UPS, if serial number is available."""
-        if not self.ups_serial_no:
-            return None
-
         return DeviceInfo(
-            identifiers={(DOMAIN, self.ups_serial_no)},
+            identifiers={(DOMAIN, self.ups_serial_no or self.config_entry.entry_id)},
             model=self.ups_model,
             manufacturer="APC",
             name=self.ups_name if self.ups_name else "APC UPS",