diff --git a/apps/predbat/solis.py b/apps/predbat/solis.py
index a39cc1900..172654000 100644
--- a/apps/predbat/solis.py
+++ b/apps/predbat/solis.py
@@ -1982,6 +1982,24 @@ async def publish_entities(self):
                 except (ValueError, TypeError):
                     self.log("Warn: Failed to convert battery capacity for {}: {}".format(inverter_sn, battery_capacity_ah))  # Debug log
 
+            # Data logger timestamp from inverterDetail API (shows when the data logger last reported to SolisCloud)
+            data_timestamp_ms = detail.get("dataTimestamp")
+            if data_timestamp_ms is not None:
+                try:
+                    data_timestamp_dt = datetime.fromtimestamp(int(data_timestamp_ms) / 1000, tz=UTC)
+                    self.dashboard_item(
+                        f"sensor.{prefix}_solis_{inverter_sn_lower}_data_timestamp",
+                        state=data_timestamp_dt.isoformat(),
+                        attributes={
+                            "friendly_name": f"Solis {inverter_name} Data Logger Timestamp",
+                            "device_class": "timestamp",
+                            "icon": "mdi:clock-check-outline",
+                        },
+                        app="solis"
+                    )
+                except (ValueError, TypeError, OSError):
+                    self.log(f"Warn: Failed to parse dataTimestamp for {inverter_sn}: {data_timestamp_ms}")
+
     # ==================== Control Methods ====================
 
     async def set_storage_mode_if_needed(self, inverter_sn, mode):