diff --git a/homeassistant/components/imeon_inverter/const.py b/homeassistant/components/imeon_inverter/const.py
index 9cde40e01d7..45d43b1c1ef 100644
--- a/homeassistant/components/imeon_inverter/const.py
+++ b/homeassistant/components/imeon_inverter/const.py
@@ -9,6 +9,7 @@ PLATFORMS = [
 ]
 ATTR_BATTERY_STATUS = ["charging", "discharging", "charged"]
 ATTR_INVERTER_STATE = [
+    "not_connected",
     "unsynchronized",
     "grid_consumption",
     "grid_injection",
diff --git a/homeassistant/components/imeon_inverter/strings.json b/homeassistant/components/imeon_inverter/strings.json
index 66d0472b89a..6e1e3bb69ff 100644
--- a/homeassistant/components/imeon_inverter/strings.json
+++ b/homeassistant/components/imeon_inverter/strings.json
@@ -91,6 +91,7 @@
       "manager_inverter_state": {
         "name": "Inverter state",
         "state": {
+          "not_connected": "Not connected",
           "unsynchronized": "Unsynchronized",
           "grid_consumption": "Grid consumption",
           "grid_injection": "Grid injection",
diff --git a/tests/components/imeon_inverter/snapshots/test_sensor.ambr b/tests/components/imeon_inverter/snapshots/test_sensor.ambr
index 673f561d540..b860566a516 100644
--- a/tests/components/imeon_inverter/snapshots/test_sensor.ambr
+++ b/tests/components/imeon_inverter/snapshots/test_sensor.ambr
@@ -1351,6 +1351,7 @@
     'area_id': None,
     'capabilities': dict({
       'options': list([
+        'not_connected',
         'unsynchronized',
         'grid_consumption',
         'grid_injection',
@@ -1392,6 +1393,7 @@
       'device_class': 'enum',
       'friendly_name': 'Imeon inverter Inverter state',
       'options': list([
+        'not_connected',
         'unsynchronized',
         'grid_consumption',
         'grid_injection',