diff --git a/homeassistant/components/fronius/__init__.py b/homeassistant/components/fronius/__init__.py
index e30f8e85fa0..03d80e3b2d9 100644
--- a/homeassistant/components/fronius/__init__.py
+++ b/homeassistant/components/fronius/__init__.py
@@ -226,7 +226,14 @@ class FroniusSolarNet:
                 _LOGGER.debug("Re-scan failed for %s", self.host)
                 return inverter_infos
 
-            raise ConfigEntryNotReady from err
+            raise ConfigEntryNotReady(
+                translation_domain=DOMAIN,
+                translation_key="entry_cannot_connect",
+                translation_placeholders={
+                    "host": self.host,
+                    "fronius_error": str(err),
+                },
+            ) from err
 
         for inverter in _inverter_info["inverters"]:
             solar_net_id = inverter["device_id"]["value"]
diff --git a/homeassistant/components/fronius/config_flow.py b/homeassistant/components/fronius/config_flow.py
index 2adbf2ae2f3..1d5a26984fa 100644
--- a/homeassistant/components/fronius/config_flow.py
+++ b/homeassistant/components/fronius/config_flow.py
@@ -56,7 +56,10 @@ async def validate_host(
         _LOGGER.debug(err)
         raise CannotConnect from err
     except StopIteration as err:
-        raise CannotConnect("No supported Fronius SolarNet device found.") from err
+        raise CannotConnect(
+            translation_domain=DOMAIN,
+            translation_key="no_supported_device_found",
+        ) from err
     first_inverter_uid: str = first_inverter["unique_id"]["value"]
     return first_inverter_uid, FroniusConfigEntryData(
         host=host,
diff --git a/homeassistant/components/fronius/coordinator.py b/homeassistant/components/fronius/coordinator.py
index c3dea123a77..d4f1fc6c230 100644
--- a/homeassistant/components/fronius/coordinator.py
+++ b/homeassistant/components/fronius/coordinator.py
@@ -13,6 +13,7 @@ from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.update_coordinator import DataUpdateCoordinator, UpdateFailed
 
 from .const import (
+    DOMAIN,
     SOLAR_NET_ID_POWER_FLOW,
     SOLAR_NET_ID_SYSTEM,
     FroniusDeviceInfo,
@@ -67,7 +68,11 @@ class FroniusCoordinatorBase(
                 self._failed_update_count += 1
                 if self._failed_update_count == self.MAX_FAILED_UPDATES:
                     self.update_interval = self.error_interval
-                raise UpdateFailed(err) from err
+                raise UpdateFailed(
+                    translation_domain=DOMAIN,
+                    translation_key="update_failed",
+                    translation_placeholders={"fronius_error": str(err)},
+                ) from err
 
             if self._failed_update_count != 0:
                 self._failed_update_count = 0
diff --git a/homeassistant/components/fronius/sensor.py b/homeassistant/components/fronius/sensor.py
index c8a840b1c2c..95c5df269e4 100644
--- a/homeassistant/components/fronius/sensor.py
+++ b/homeassistant/components/fronius/sensor.py
@@ -54,6 +54,9 @@ if TYPE_CHECKING:
         FroniusStorageUpdateCoordinator,
     )
 
+
+PARALLEL_UPDATES = 0
+
 ENERGY_VOLT_AMPERE_REACTIVE_HOUR: Final = "varh"
 
 
diff --git a/homeassistant/components/fronius/strings.json b/homeassistant/components/fronius/strings.json
index dfdcfc0ddb2..86348a0e2d7 100644
--- a/homeassistant/components/fronius/strings.json
+++ b/homeassistant/components/fronius/strings.json
@@ -294,5 +294,16 @@
         "name": "[%key:component::sensor::entity_component::temperature::name%]"
       }
     }
+  },
+  "exceptions": {
+    "no_supported_device_found": {
+      "message": "No supported Fronius SolarNet device found."
+    },
+    "entry_cannot_connect": {
+      "message": "Failed to connect to Fronius device at {host}: {fronius_error}"
+    },
+    "update_failed": {
+      "message": "An error occurred while attempting to fetch data: {fronius_error}"
+    }
   }
 }