homevolt

Signed-off-by: Daniel Hjelseth Høyer <github@dahoiv.net>

CODEOWNERS

@@ -711,6 +711,8 @@ build.json @home-assistant/supervisor
 /tests/components/homematic/ @pvizeli
 /homeassistant/components/homematicip_cloud/ @hahn-th
 /tests/components/homematicip_cloud/ @hahn-th
+/homeassistant/components/homevolt/ @danielhiversen
+/tests/components/homevolt/ @danielhiversen
 /homeassistant/components/homewizard/ @DCSBL
 /tests/components/homewizard/ @DCSBL
 /homeassistant/components/honeywell/ @rdfurman @mkmer

homeassistant/components/homevolt/__init__.py

@@ -0,0 +1,36 @@
+"""The Homevolt integration."""
+
+from __future__ import annotations
+
+from homevolt import Homevolt
+
+from homeassistant.const import CONF_HOST, CONF_PASSWORD, Platform
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.aiohttp_client import async_get_clientsession
+
+from .coordinator import HomevoltConfigEntry, HomevoltDataUpdateCoordinator
+
+PLATFORMS: list[Platform] = [Platform.SENSOR]
+
+
+async def async_setup_entry(hass: HomeAssistant, entry: HomevoltConfigEntry) -> bool:
+    """Set up Homevolt from a config entry."""
+    host: str = entry.data[CONF_HOST]
+    password: str | None = entry.data.get(CONF_PASSWORD)
+
+    websession = async_get_clientsession(hass)
+    client = Homevolt(host, password, websession=websession)
+
+    coordinator = HomevoltDataUpdateCoordinator(hass, entry, client)
+    await coordinator.async_config_entry_first_refresh()
+
+    entry.runtime_data = coordinator
+
+    await hass.config_entries.async_forward_entry_setups(entry, PLATFORMS)
+
+    return True
+
+
+async def async_unload_entry(hass: HomeAssistant, entry: HomevoltConfigEntry) -> bool:
+    """Unload a config entry."""
+    return await hass.config_entries.async_unload_platforms(entry, PLATFORMS)

homeassistant/components/homevolt/config_flow.py

@@ -0,0 +1,70 @@
+"""Config flow for the Homevolt integration."""
+
+from __future__ import annotations
+
+import logging
+from typing import Any
+
+from homevolt import Homevolt, HomevoltAuthenticationError, HomevoltConnectionError
+import voluptuous as vol
+
+from homeassistant.config_entries import ConfigFlow, ConfigFlowResult
+from homeassistant.const import CONF_HOST, CONF_PASSWORD
+from homeassistant.helpers.aiohttp_client import async_get_clientsession
+
+from .const import DOMAIN
+
+_LOGGER = logging.getLogger(__name__)
+
+STEP_USER_DATA_SCHEMA = vol.Schema(
+    {
+        vol.Required(CONF_HOST): str,
+        vol.Optional(CONF_PASSWORD): str,
+    }
+)
+
+
+class HomevoltConfigFlow(ConfigFlow, domain=DOMAIN):
+    """Handle a config flow for Homevolt."""
+
+    VERSION = 1
+    MINOR_VERSION = 1
+
+    async def async_step_user(
+        self, user_input: dict[str, Any] | None = None
+    ) -> ConfigFlowResult:
+        """Handle the initial step."""
+        errors: dict[str, str] = {}
+        if user_input is not None:
+            host = user_input[CONF_HOST]
+            password = user_input.get(CONF_PASSWORD)
+            websession = async_get_clientsession(self.hass)
+            client = Homevolt(host, password, websession=websession)
+            try:
+                await client.update_info()
+                device = client.get_device()
+                device_id = device.device_id
+            except HomevoltAuthenticationError:
+                errors["base"] = "invalid_auth"
+            except HomevoltConnectionError:
+                errors["base"] = "cannot_connect"
+            except Exception:
+                _LOGGER.exception(
+                    "Error occurred while connecting to the Homevolt battery"
+                )
+                errors["base"] = "unknown"
+            else:
+                await self.async_set_unique_id(device_id)
+                self._abort_if_unique_id_configured()
+
+                return self.async_create_entry(
+                    title="Homevolt Local",
+                    data={
+                        CONF_HOST: host,
+                        CONF_PASSWORD: password,
+                    },
+                )
+
+        return self.async_show_form(
+            step_id="user", data_schema=STEP_USER_DATA_SCHEMA, errors=errors
+        )

homeassistant/components/homevolt/const.py

@@ -0,0 +1,9 @@
+"""Constants for the Homevolt integration."""
+
+from __future__ import annotations
+
+from datetime import timedelta
+
+DOMAIN = "homevolt"
+MANUFACTURER = "Homevolt"
+SCAN_INTERVAL = timedelta(seconds=15)

homeassistant/components/homevolt/coordinator.py

@@ -0,0 +1,56 @@
+"""Data update coordinator for Homevolt integration."""
+
+from __future__ import annotations
+
+import logging
+
+from homevolt import (
+    Device,
+    Homevolt,
+    HomevoltAuthenticationError,
+    HomevoltConnectionError,
+    HomevoltError,
+)
+
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.core import HomeAssistant
+from homeassistant.exceptions import ConfigEntryAuthFailed
+from homeassistant.helpers.update_coordinator import DataUpdateCoordinator, UpdateFailed
+
+from .const import DOMAIN, SCAN_INTERVAL
+
+type HomevoltConfigEntry = ConfigEntry[HomevoltDataUpdateCoordinator]
+
+_LOGGER = logging.getLogger(__name__)
+
+
+class HomevoltDataUpdateCoordinator(DataUpdateCoordinator[Device]):
+    """Class to manage fetching Homevolt data."""
+
+    config_entry: HomevoltConfigEntry
+
+    def __init__(
+        self,
+        hass: HomeAssistant,
+        entry: HomevoltConfigEntry,
+        client: Homevolt,
+    ) -> None:
+        """Initialize the Homevolt coordinator."""
+        self.client = client
+        super().__init__(
+            hass,
+            _LOGGER,
+            name=DOMAIN,
+            update_interval=SCAN_INTERVAL,
+            config_entry=entry,
+        )
+
+    async def _async_update_data(self) -> Device:
+        """Fetch data from the Homevolt API."""
+        try:
+            await self.client.update_info()
+            return self.client.get_device()
+        except HomevoltAuthenticationError as err:
+            raise ConfigEntryAuthFailed from err
+        except (HomevoltConnectionError, HomevoltError) as err:
+            raise UpdateFailed(f"Error communicating with device: {err}") from err

homeassistant/components/homevolt/manifest.json

@@ -0,0 +1,12 @@
+{
+  "domain": "homevolt",
+  "name": "Homevolt",
+  "codeowners": ["@danielhiversen"],
+  "config_flow": true,
+  "dependencies": [],
+  "documentation": "https://www.home-assistant.io/integrations/homevolt",
+  "integration_type": "device",
+  "iot_class": "local_polling",
+  "quality_scale": "bronze",
+  "requirements": ["homevolt==0.2.4"]
+}

homeassistant/components/homevolt/quality_scale.yaml

@@ -0,0 +1,70 @@
+rules:
+  # Bronze
+  action-setup:
+    status: exempt
+    comment: Integration does not register custom actions.
+  appropriate-polling: done
+  brands: done
+  common-modules: done
+  config-flow-test-coverage: done
+  config-flow: done
+  dependency-transparency: done
+  docs-actions:
+    status: exempt
+    comment: Integration does not register custom actions.
+  docs-high-level-description: done
+  docs-installation-instructions: done
+  docs-removal-instructions: done
+  entity-event-setup:
+    status: exempt
+    comment: Local_polling without events
+  entity-unique-id: done
+  has-entity-name: done
+  runtime-data: done
+  test-before-configure: done
+  test-before-setup: done
+  unique-config-entry: done
+
+  # Silver
+  action-exceptions:
+    status: exempt
+    comment: Integration does not register custom actions.
+  config-entry-unloading: done
+  docs-configuration-parameters:
+    status: exempt
+    comment: Integration does not have an options flow.
+  docs-installation-parameters: todo
+  entity-unavailable: done
+  integration-owner: done
+  log-when-unavailable: todo
+  parallel-updates: done
+  reauthentication-flow: todo
+  test-coverage: todo
+
+  # Gold
+  devices: done
+  diagnostics: todo
+  discovery-update-info: todo
+  discovery: todo
+  docs-data-update: todo
+  docs-examples: todo
+  docs-known-limitations: todo
+  docs-supported-devices: todo
+  docs-supported-functions: todo
+  docs-troubleshooting: todo
+  docs-use-cases: todo
+  dynamic-devices: todo
+  entity-category: todo
+  entity-device-class: done
+  entity-disabled-by-default: todo
+  entity-translations: done
+  exception-translations: todo
+  icon-translations: todo
+  reconfiguration-flow: todo
+  repair-issues: todo
+  stale-devices: todo
+
+  # Platinum
+  async-dependency: done
+  inject-websession: done
+  strict-typing: todo

homeassistant/components/homevolt/sensor.py

@@ -0,0 +1,162 @@
+"""Support for Homevolt sensors."""
+
+from __future__ import annotations
+
+from homevolt.models import SensorType
+
+from homeassistant.components.sensor import (
+    SensorDeviceClass,
+    SensorEntity,
+    SensorEntityDescription,
+    SensorStateClass,
+)
+from homeassistant.const import (
+    PERCENTAGE,
+    SIGNAL_STRENGTH_DECIBELS,
+    UnitOfElectricCurrent,
+    UnitOfElectricPotential,
+    UnitOfEnergy,
+    UnitOfFrequency,
+    UnitOfPower,
+    UnitOfTemperature,
+)
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.device_registry import DeviceInfo
+from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback
+from homeassistant.helpers.typing import StateType
+from homeassistant.helpers.update_coordinator import CoordinatorEntity
+
+from .const import DOMAIN, MANUFACTURER
+from .coordinator import HomevoltConfigEntry, HomevoltDataUpdateCoordinator
+
+PARALLEL_UPDATES = 0  # Coordinator-based updates
+
+SENSORS: tuple[SensorEntityDescription, ...] = (
+    SensorEntityDescription(
+        key=SensorType.COUNT,
+        state_class=SensorStateClass.TOTAL_INCREASING,
+    ),
+    SensorEntityDescription(
+        key=SensorType.ENERGY_TOTAL,
+        device_class=SensorDeviceClass.ENERGY,
+        state_class=SensorStateClass.TOTAL,
+        native_unit_of_measurement=UnitOfEnergy.WATT_HOUR,
+    ),
+    SensorEntityDescription(
+        key=SensorType.ENERGY_INCREASING,
+        device_class=SensorDeviceClass.ENERGY,
+        state_class=SensorStateClass.TOTAL_INCREASING,
+        native_unit_of_measurement=UnitOfEnergy.WATT_HOUR,
+    ),
+    SensorEntityDescription(
+        key=SensorType.FREQUENCY,
+        device_class=SensorDeviceClass.FREQUENCY,
+        state_class=SensorStateClass.MEASUREMENT,
+        native_unit_of_measurement=UnitOfFrequency.HERTZ,
+    ),
+    SensorEntityDescription(
+        key=SensorType.PERCENTAGE,
+        device_class=SensorDeviceClass.BATTERY,
+        state_class=SensorStateClass.MEASUREMENT,
+        native_unit_of_measurement=PERCENTAGE,
+    ),
+    SensorEntityDescription(
+        key=SensorType.POWER,
+        device_class=SensorDeviceClass.POWER,
+        state_class=SensorStateClass.MEASUREMENT,
+        native_unit_of_measurement=UnitOfPower.WATT,
+    ),
+    SensorEntityDescription(
+        key=SensorType.SCHEDULE_TYPE,
+    ),
+    SensorEntityDescription(
+        key=SensorType.SIGNAL_STRENGTH,
+        device_class=SensorDeviceClass.SIGNAL_STRENGTH,
+        state_class=SensorStateClass.MEASUREMENT,
+        native_unit_of_measurement=SIGNAL_STRENGTH_DECIBELS,
+    ),
+    SensorEntityDescription(
+        key=SensorType.TEMPERATURE,
+        device_class=SensorDeviceClass.TEMPERATURE,
+        state_class=SensorStateClass.MEASUREMENT,
+        native_unit_of_measurement=UnitOfTemperature.CELSIUS,
+    ),
+    SensorEntityDescription(
+        key=SensorType.TEXT,
+    ),
+    SensorEntityDescription(
+        key=SensorType.VOLTAGE,
+        device_class=SensorDeviceClass.VOLTAGE,
+        state_class=SensorStateClass.MEASUREMENT,
+        native_unit_of_measurement=UnitOfElectricPotential.VOLT,
+    ),
+    SensorEntityDescription(
+        key=SensorType.CURRENT,
+        device_class=SensorDeviceClass.CURRENT,
+        state_class=SensorStateClass.MEASUREMENT,
+        native_unit_of_measurement=UnitOfElectricCurrent.AMPERE,
+    ),
+)
+
+
+async def async_setup_entry(
+    hass: HomeAssistant,
+    entry: HomevoltConfigEntry,
+    async_add_entities: AddConfigEntryEntitiesCallback,
+) -> None:
+    """Set up the Homevolt sensor."""
+    coordinator = entry.runtime_data
+    entities = []
+    sensors_by_key = {sensor.key: sensor for sensor in SENSORS}
+    for sensor_key, sensor in coordinator.data.sensors.items():
+        if (description := sensors_by_key.get(sensor.type)) is None:
+            continue
+        entities.append(
+            HomevoltSensor(
+                description,
+                coordinator,
+                sensor_key,
+            )
+        )
+    async_add_entities(entities)
+
+
+class HomevoltSensor(CoordinatorEntity[HomevoltDataUpdateCoordinator], SensorEntity):
+    """Representation of a Homevolt sensor."""
+
+    _attr_has_entity_name = True
+
+    def __init__(
+        self,
+        description: SensorEntityDescription,
+        coordinator: HomevoltDataUpdateCoordinator,
+        sensor_key: str,
+    ) -> None:
+        """Initialize the sensor."""
+        super().__init__(coordinator)
+        self.entity_description = description
+        device_id = coordinator.data.device_id
+        self._attr_unique_id = f"{device_id}_{sensor_key}"
+        sensor_data = coordinator.data.sensors[sensor_key]
+        self._attr_translation_key = sensor_data.slug
+        self._sensor_key = sensor_key
+        device_metadata = coordinator.data.device_metadata.get(
+            sensor_data.device_identifier
+        )
+        self._attr_device_info = DeviceInfo(
+            identifiers={(DOMAIN, f"{device_id}_{sensor_data.device_identifier}")},
+            configuration_url=coordinator.client.base_url,
+            manufacturer=MANUFACTURER,
+            model=device_metadata.model if device_metadata else None,
+            name=device_metadata.name if device_metadata else None,
+        )
+
+    @property
+    def available(self) -> bool:
+        """Return if entity is available."""
+        return super().available and self._sensor_key in self.coordinator.data.sensors
+
+    @property
+    def native_value(self) -> StateType:
+        """Return the native value of the sensor."""
+        return self.coordinator.data.sensors[self._sensor_key].value

homeassistant/components/homevolt/strings.json

@@ -0,0 +1,198 @@
+{
+  "config": {
+    "abort": {
+      "already_configured": "[%key:common::config_flow::abort::already_configured_device%]"
+    },
+    "error": {
+      "cannot_connect": "[%key:common::config_flow::error::cannot_connect%]",
+      "invalid_auth": "[%key:common::config_flow::error::invalid_auth%]",
+      "unknown": "[%key:common::config_flow::error::unknown%]"
+    },
+    "step": {
+      "user": {
+        "data": {
+          "host": "[%key:common::config_flow::data::host%]",
+          "password": "[%key:common::config_flow::data::password%]"
+        },
+        "data_description": {
+          "host": "The IP address or hostname of your Homevolt battery on your local network.",
+          "password": "The local password configured for your Homevolt battery, if required."
+        },
+        "description": "Connect Home Assistant to your Homevolt battery over the local network.",
+        "title": "Homevolt Local"
+      }
+    }
+  },
+  "entity": {
+    "sensor": {
+      "available_charging_energy": {
+        "name": "Available charging energy"
+      },
+      "available_charging_power": {
+        "name": "Available charging power"
+      },
+      "available_discharge_energy": {
+        "name": "Available discharge energy"
+      },
+      "available_discharge_power": {
+        "name": "Available discharge power"
+      },
+      "average_rssi_grid": {
+        "name": "Grid average RSSI"
+      },
+      "average_rssi_load": {
+        "name": "Load average RSSI"
+      },
+      "battery_state_of_charge": {
+        "name": "Battery state of charge"
+      },
+      "charge_cycles": {
+        "name": "Charge cycles"
+      },
+      "energy_exported_grid": {
+        "name": "Grid exported energy"
+      },
+      "energy_exported_load": {
+        "name": "Load exported energy"
+      },
+      "energy_imported_grid": {
+        "name": "Grid imported energy"
+      },
+      "energy_imported_load": {
+        "name": "Load imported energy"
+      },
+      "exported_energy": {
+        "name": "Exported energy"
+      },
+      "frequency": {
+        "name": "Frequency"
+      },
+      "imported_energy": {
+        "name": "Imported energy"
+      },
+      "l1_current": {
+        "name": "L1 current"
+      },
+      "l1_current_grid": {
+        "name": "Grid L1 current"
+      },
+      "l1_current_load": {
+        "name": "Load L1 current"
+      },
+      "l1_l2_voltage": {
+        "name": "L1-L2 voltage"
+      },
+      "l1_power_grid": {
+        "name": "Grid L1 power"
+      },
+      "l1_power_load": {
+        "name": "Load L1 power"
+      },
+      "l1_voltage": {
+        "name": "L1 voltage"
+      },
+      "l1_voltage_grid": {
+        "name": "Grid L1 voltage"
+      },
+      "l1_voltage_load": {
+        "name": "Load L1 voltage"
+      },
+      "l2_current": {
+        "name": "L2 current"
+      },
+      "l2_current_grid": {
+        "name": "Grid L2 current"
+      },
+      "l2_current_load": {
+        "name": "Load L2 current"
+      },
+      "l2_l3_voltage": {
+        "name": "L2-L3 voltage"
+      },
+      "l2_power_grid": {
+        "name": "Grid L2 power"
+      },
+      "l2_power_load": {
+        "name": "Load L2 power"
+      },
+      "l2_voltage": {
+        "name": "L2 voltage"
+      },
+      "l2_voltage_grid": {
+        "name": "Grid L2 voltage"
+      },
+      "l2_voltage_load": {
+        "name": "Load L2 voltage"
+      },
+      "l3_current": {
+        "name": "L3 current"
+      },
+      "l3_current_grid": {
+        "name": "Grid L3 current"
+      },
+      "l3_current_load": {
+        "name": "Load L3 current"
+      },
+      "l3_l1_voltage": {
+        "name": "L3-L1 voltage"
+      },
+      "l3_power_grid": {
+        "name": "Grid L3 power"
+      },
+      "l3_power_load": {
+        "name": "Load L3 power"
+      },
+      "l3_voltage": {
+        "name": "L3 voltage"
+      },
+      "l3_voltage_grid": {
+        "name": "Grid L3 voltage"
+      },
+      "l3_voltage_load": {
+        "name": "Load L3 voltage"
+      },
+      "power": {
+        "name": "Power"
+      },
+      "power_grid": {
+        "name": "Grid power"
+      },
+      "power_load": {
+        "name": "Load power"
+      },
+      "rssi_grid": {
+        "name": "Grid RSSI"
+      },
+      "rssi_load": {
+        "name": "Load RSSI"
+      },
+      "schedule_id": {
+        "name": "Schedule ID"
+      },
+      "schedule_max_discharge": {
+        "name": "Schedule max discharge"
+      },
+      "schedule_max_power": {
+        "name": "Schedule max power"
+      },
+      "schedule_power_setpoint": {
+        "name": "Schedule power setpoint"
+      },
+      "schedule_type": {
+        "name": "Schedule type"
+      },
+      "state_of_charge": {
+        "name": "State of charge"
+      },
+      "system_temperature": {
+        "name": "System temperature"
+      },
+      "tmax": {
+        "name": "Maximum temperature"
+      },
+      "tmin": {
+        "name": "Minimum temperature"
+      }
+    }
+  }
+}

homeassistant/generated/config_flows.py

@@ -294,6 +294,7 @@ FLOWS = {
         "homekit",
         "homekit_controller",
         "homematicip_cloud",
+        "homevolt",
         "homewizard",
         "homeworks",
         "honeywell",

homeassistant/generated/integrations.json

@@ -2836,6 +2836,12 @@
         "zwave"
       ]
     },
+    "homevolt": {
+      "name": "Homevolt",
+      "integration_type": "device",
+      "config_flow": true,
+      "iot_class": "local_polling"
+    },
     "homewizard": {
       "name": "HomeWizard",
       "integration_type": "device",

requirements_all.txt

@@ -1226,6 +1226,9 @@ homelink-integration-api==0.0.1
 # homeassistant.components.homematicip_cloud
 homematicip==2.4.0
 
+# homeassistant.components.homevolt
+homevolt==0.2.4
+
 # homeassistant.components.horizon
 horimote==0.4.1
 

requirements_test_all.txt

@@ -1084,6 +1084,9 @@ homelink-integration-api==0.0.1
 # homeassistant.components.homematicip_cloud
 homematicip==2.4.0
 
+# homeassistant.components.homevolt
+homevolt==0.2.4
+
 # homeassistant.components.remember_the_milk
 httplib2==0.20.4
 

tests/components/homevolt/__init__.py

@@ -0,0 +1 @@
+"""Tests for the Homevolt integration."""

tests/components/homevolt/conftest.py

@@ -0,0 +1,110 @@
+"""Common fixtures for the Homevolt tests."""
+
+from collections.abc import Generator
+from unittest.mock import AsyncMock, MagicMock, patch
+
+from homevolt import Device, DeviceMetadata, Sensor, SensorType
+import pytest
+
+from homeassistant.components.homevolt.const import DOMAIN
+from homeassistant.const import CONF_HOST, CONF_PASSWORD, Platform
+from homeassistant.core import HomeAssistant
+
+from tests.common import MockConfigEntry
+
+
+@pytest.fixture
+def mock_setup_entry() -> Generator[AsyncMock]:
+    """Override async_setup_entry."""
+    with patch(
+        "homeassistant.components.homevolt.async_setup_entry", return_value=True
+    ) as mock_setup_entry:
+        yield mock_setup_entry
+
+
+@pytest.fixture
+def mock_config_entry() -> MockConfigEntry:
+    """Return the default mocked config entry."""
+    return MockConfigEntry(
+        title="Homevolt",
+        domain=DOMAIN,
+        data={
+            CONF_HOST: "127.0.0.1",
+            CONF_PASSWORD: "test-password",
+        },
+        unique_id="40580137858664",
+    )
+
+
+@pytest.fixture
+def mock_homevolt_client() -> Generator[MagicMock]:
+    """Return a mocked Homevolt client."""
+    with (
+        patch(
+            "homeassistant.components.homevolt.Homevolt",
+            autospec=True,
+        ) as homevolt_mock,
+        patch(
+            "homeassistant.components.homevolt.config_flow.Homevolt",
+            new=homevolt_mock,
+        ),
+    ):
+        client = homevolt_mock.return_value
+        client.base_url = "http://127.0.0.1"
+        client.update_info = AsyncMock()
+
+        # Create a mock Device with sensors
+        device = MagicMock(spec=Device)
+        device.device_id = "40580137858664"
+        device.sensors = {
+            "L1 Voltage": Sensor(
+                value=234.5,
+                type=SensorType.VOLTAGE,
+                device_identifier="ems_40580137858664",
+                slug="l1_voltage",
+            ),
+            "Battery State of Charge": Sensor(
+                value=80.6,
+                type=SensorType.PERCENTAGE,
+                device_identifier="ems_40580137858664",
+                slug="battery_state_of_charge",
+            ),
+            "Power": Sensor(
+                value=-12,
+                type=SensorType.POWER,
+                device_identifier="ems_40580137858664",
+                slug="power",
+            ),
+        }
+        device.device_metadata = {
+            "ems_40580137858664": DeviceMetadata(
+                name="Homevolt EMS",
+                model="EMS-1000",
+            ),
+        }
+        client.get_device.return_value = device
+
+        yield client
+
+
+@pytest.fixture
+def platforms() -> list[Platform]:
+    """Return the platforms to test."""
+    return [Platform.SENSOR]
+
+
+@pytest.fixture
+async def init_integration(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+    mock_homevolt_client: MagicMock,
+    platforms: list[Platform],
+) -> MockConfigEntry:
+    """Set up the Homevolt integration for testing."""
+    mock_config_entry.add_to_hass(hass)
+
+    with patch("homeassistant.components.homevolt.PLATFORMS", platforms):
+        await hass.config_entries.async_setup(mock_config_entry.entry_id)
+        await hass.async_block_till_done()
+
+    return mock_config_entry

tests/components/homevolt/snapshots/test_sensor.ambr

@@ -0,0 +1,169 @@
+# serializer version: 1
+# name: test_entities[sensor.homevolt_ems_battery_state_of_charge-entry]
+  EntityRegistryEntrySnapshot({
+    'aliases': set({
+    }),
+    'area_id': None,
+    'capabilities': dict({
+      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
+    }),
+    'config_entry_id': <ANY>,
+    'config_subentry_id': <ANY>,
+    'device_class': None,
+    'device_id': <ANY>,
+    'disabled_by': None,
+    'domain': 'sensor',
+    'entity_category': None,
+    'entity_id': 'sensor.homevolt_ems_battery_state_of_charge',
+    'has_entity_name': True,
+    'hidden_by': None,
+    'icon': None,
+    'id': <ANY>,
+    'labels': set({
+    }),
+    'name': None,
+    'object_id_base': 'Battery state of charge',
+    'options': dict({
+    }),
+    'original_device_class': <SensorDeviceClass.BATTERY: 'battery'>,
+    'original_icon': None,
+    'original_name': 'Battery state of charge',
+    'platform': 'homevolt',
+    'previous_unique_id': None,
+    'suggested_object_id': None,
+    'supported_features': 0,
+    'translation_key': 'battery_state_of_charge',
+    'unique_id': '40580137858664_Battery State of Charge',
+    'unit_of_measurement': '%',
+  })
+# ---
+# name: test_entities[sensor.homevolt_ems_battery_state_of_charge-state]
+  StateSnapshot({
+    'attributes': ReadOnlyDict({
+      'device_class': 'battery',
+      'friendly_name': 'Homevolt EMS Battery state of charge',
+      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
+      'unit_of_measurement': '%',
+    }),
+    'context': <ANY>,
+    'entity_id': 'sensor.homevolt_ems_battery_state_of_charge',
+    'last_changed': <ANY>,
+    'last_reported': <ANY>,
+    'last_updated': <ANY>,
+    'state': '80.6',
+  })
+# ---
+# name: test_entities[sensor.homevolt_ems_l1_voltage-entry]
+  EntityRegistryEntrySnapshot({
+    'aliases': set({
+    }),
+    'area_id': None,
+    'capabilities': dict({
+      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
+    }),
+    'config_entry_id': <ANY>,
+    'config_subentry_id': <ANY>,
+    'device_class': None,
+    'device_id': <ANY>,
+    'disabled_by': None,
+    'domain': 'sensor',
+    'entity_category': None,
+    'entity_id': 'sensor.homevolt_ems_l1_voltage',
+    'has_entity_name': True,
+    'hidden_by': None,
+    'icon': None,
+    'id': <ANY>,
+    'labels': set({
+    }),
+    'name': None,
+    'object_id_base': 'L1 voltage',
+    'options': dict({
+      'sensor': dict({
+        'suggested_display_precision': 0,
+      }),
+    }),
+    'original_device_class': <SensorDeviceClass.VOLTAGE: 'voltage'>,
+    'original_icon': None,
+    'original_name': 'L1 voltage',
+    'platform': 'homevolt',
+    'previous_unique_id': None,
+    'suggested_object_id': None,
+    'supported_features': 0,
+    'translation_key': 'l1_voltage',
+    'unique_id': '40580137858664_L1 Voltage',
+    'unit_of_measurement': <UnitOfElectricPotential.VOLT: 'V'>,
+  })
+# ---
+# name: test_entities[sensor.homevolt_ems_l1_voltage-state]
+  StateSnapshot({
+    'attributes': ReadOnlyDict({
+      'device_class': 'voltage',
+      'friendly_name': 'Homevolt EMS L1 voltage',
+      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
+      'unit_of_measurement': <UnitOfElectricPotential.VOLT: 'V'>,
+    }),
+    'context': <ANY>,
+    'entity_id': 'sensor.homevolt_ems_l1_voltage',
+    'last_changed': <ANY>,
+    'last_reported': <ANY>,
+    'last_updated': <ANY>,
+    'state': '234.5',
+  })
+# ---
+# name: test_entities[sensor.homevolt_ems_power-entry]
+  EntityRegistryEntrySnapshot({
+    'aliases': set({
+    }),
+    'area_id': None,
+    'capabilities': dict({
+      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
+    }),
+    'config_entry_id': <ANY>,
+    'config_subentry_id': <ANY>,
+    'device_class': None,
+    'device_id': <ANY>,
+    'disabled_by': None,
+    'domain': 'sensor',
+    'entity_category': None,
+    'entity_id': 'sensor.homevolt_ems_power',
+    'has_entity_name': True,
+    'hidden_by': None,
+    'icon': None,
+    'id': <ANY>,
+    'labels': set({
+    }),
+    'name': None,
+    'object_id_base': 'Power',
+    'options': dict({
+      'sensor': dict({
+        'suggested_display_precision': 0,
+      }),
+    }),
+    'original_device_class': <SensorDeviceClass.POWER: 'power'>,
+    'original_icon': None,
+    'original_name': 'Power',
+    'platform': 'homevolt',
+    'previous_unique_id': None,
+    'suggested_object_id': None,
+    'supported_features': 0,
+    'translation_key': 'power',
+    'unique_id': '40580137858664_Power',
+    'unit_of_measurement': <UnitOfPower.WATT: 'W'>,
+  })
+# ---
+# name: test_entities[sensor.homevolt_ems_power-state]
+  StateSnapshot({
+    'attributes': ReadOnlyDict({
+      'device_class': 'power',
+      'friendly_name': 'Homevolt EMS Power',
+      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
+      'unit_of_measurement': <UnitOfPower.WATT: 'W'>,
+    }),
+    'context': <ANY>,
+    'entity_id': 'sensor.homevolt_ems_power',
+    'last_changed': <ANY>,
+    'last_reported': <ANY>,
+    'last_updated': <ANY>,
+    'state': '-12',
+  })
+# ---

tests/components/homevolt/test_config_flow.py

@@ -0,0 +1,170 @@
+"""Tests for the Homevolt config flow."""
+
+from __future__ import annotations
+
+from unittest.mock import AsyncMock, MagicMock, patch
+
+from homevolt import HomevoltAuthenticationError, HomevoltConnectionError
+import pytest
+
+from homeassistant.components.homevolt.const import DOMAIN
+from homeassistant.config_entries import SOURCE_USER
+from homeassistant.const import CONF_HOST, CONF_PASSWORD
+from homeassistant.core import HomeAssistant
+from homeassistant.data_entry_flow import FlowResultType
+
+from tests.common import MockConfigEntry
+
+
+async def test_full_flow_success(
+    hass: HomeAssistant, mock_setup_entry: AsyncMock
+) -> None:
+    """Test a complete successful user flow."""
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": SOURCE_USER}
+    )
+
+    assert result["type"] is FlowResultType.FORM
+    assert result["step_id"] == "user"
+    assert result["errors"] == {}
+
+    user_input = {
+        CONF_HOST: "192.168.1.100",
+        CONF_PASSWORD: "test-password",
+    }
+
+    with (
+        patch(
+            "homeassistant.components.homevolt.config_flow.Homevolt.update_info",
+            new_callable=AsyncMock,
+        ),
+        patch(
+            "homeassistant.components.homevolt.config_flow.Homevolt.get_device",
+        ) as mock_get_device,
+    ):
+        mock_device = MagicMock()
+        mock_device.device_id = "40580137858664"
+        mock_get_device.return_value = mock_device
+        result = await hass.config_entries.flow.async_configure(
+            result["flow_id"],
+            user_input,
+        )
+        await hass.async_block_till_done()
+
+    assert result["type"] is FlowResultType.CREATE_ENTRY
+    assert result["title"] == "Homevolt Local"
+    assert result["data"] == user_input
+    assert len(mock_setup_entry.mock_calls) == 1
+
+
+@pytest.mark.parametrize(
+    ("exception", "expected_error"),
+    [
+        (HomevoltAuthenticationError, "invalid_auth"),
+        (HomevoltConnectionError, "cannot_connect"),
+        (Exception, "unknown"),
+    ],
+)
+async def test_step_user_errors(
+    hass: HomeAssistant,
+    mock_setup_entry: AsyncMock,
+    exception: Exception,
+    expected_error: str,
+) -> None:
+    """Test error cases for the user step with recovery."""
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": SOURCE_USER}
+    )
+
+    assert result["type"] is FlowResultType.FORM
+    assert result["step_id"] == "user"
+    assert result["errors"] == {}
+
+    user_input = {
+        CONF_HOST: "192.168.1.100",
+        CONF_PASSWORD: "test-password",
+    }
+
+    with patch(
+        "homeassistant.components.homevolt.config_flow.Homevolt.update_info",
+        new_callable=AsyncMock,
+    ) as mock_update_info:
+        mock_update_info.side_effect = exception
+
+        result = await hass.config_entries.flow.async_configure(
+            result["flow_id"],
+            user_input,
+        )
+
+    assert result["type"] is FlowResultType.FORM
+    assert result["step_id"] == "user"
+    assert result["errors"] == {"base": expected_error}
+
+    with (
+        patch(
+            "homeassistant.components.homevolt.config_flow.Homevolt.update_info",
+            new_callable=AsyncMock,
+        ),
+        patch(
+            "homeassistant.components.homevolt.config_flow.Homevolt.get_device",
+        ) as mock_get_device,
+    ):
+        mock_device = MagicMock()
+        mock_device.device_id = "40580137858664"
+        mock_get_device.return_value = mock_device
+        result = await hass.config_entries.flow.async_configure(
+            result["flow_id"],
+            user_input,
+        )
+        await hass.async_block_till_done()
+
+    assert result["type"] is FlowResultType.CREATE_ENTRY
+    assert result["title"] == "Homevolt Local"
+    assert result["data"] == user_input
+    assert len(mock_setup_entry.mock_calls) == 1
+
+
+async def test_duplicate_entry(
+    hass: HomeAssistant,
+    mock_setup_entry: AsyncMock,
+) -> None:
+    """Test that a duplicate device_id aborts the flow."""
+    existing_entry = MockConfigEntry(
+        domain=DOMAIN,
+        data={CONF_HOST: "192.168.1.100", CONF_PASSWORD: "test-password"},
+        unique_id="40580137858664",
+    )
+    existing_entry.add_to_hass(hass)
+
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": SOURCE_USER}
+    )
+
+    assert result["type"] is FlowResultType.FORM
+    assert result["step_id"] == "user"
+    assert result["errors"] == {}
+
+    user_input = {
+        CONF_HOST: "192.168.1.200",
+        CONF_PASSWORD: "test-password",
+    }
+
+    with (
+        patch(
+            "homeassistant.components.homevolt.config_flow.Homevolt.update_info",
+            new_callable=AsyncMock,
+        ),
+        patch(
+            "homeassistant.components.homevolt.config_flow.Homevolt.get_device",
+        ) as mock_get_device,
+    ):
+        mock_device = MagicMock()
+        mock_device.device_id = "40580137858664"
+        mock_get_device.return_value = mock_device
+        result = await hass.config_entries.flow.async_configure(
+            result["flow_id"],
+            user_input,
+        )
+
+    assert result["type"] is FlowResultType.ABORT
+    assert result["reason"] == "already_configured"

tests/components/homevolt/test_init.py

@@ -0,0 +1,65 @@
+"""Test the Homevolt init module."""
+
+from __future__ import annotations
+
+from unittest.mock import MagicMock
+
+from homevolt import HomevoltAuthenticationError, HomevoltConnectionError
+
+from homeassistant.config_entries import ConfigEntryState
+from homeassistant.core import HomeAssistant
+
+from tests.common import MockConfigEntry
+
+
+async def test_load_unload_entry(
+    hass: HomeAssistant,
+    mock_homevolt_client: MagicMock,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test load and unload entry."""
+    mock_config_entry.add_to_hass(hass)
+
+    await hass.config_entries.async_setup(mock_config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    assert mock_config_entry.state is ConfigEntryState.LOADED
+
+    await hass.config_entries.async_remove(mock_config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    assert mock_config_entry.state is ConfigEntryState.NOT_LOADED
+
+
+async def test_config_entry_not_ready(
+    hass: HomeAssistant,
+    mock_homevolt_client: MagicMock,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test the Homevolt configuration entry not ready."""
+    mock_homevolt_client.update_info.side_effect = HomevoltConnectionError(
+        "Connection failed"
+    )
+    mock_config_entry.add_to_hass(hass)
+
+    await hass.config_entries.async_setup(mock_config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    assert mock_config_entry.state is ConfigEntryState.SETUP_RETRY
+
+
+async def test_config_entry_auth_failed(
+    hass: HomeAssistant,
+    mock_homevolt_client: MagicMock,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test the Homevolt configuration entry authentication failed."""
+    mock_homevolt_client.update_info.side_effect = HomevoltAuthenticationError(
+        "Authentication failed"
+    )
+    mock_config_entry.add_to_hass(hass)
+
+    await hass.config_entries.async_setup(mock_config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    assert mock_config_entry.state is ConfigEntryState.SETUP_ERROR

tests/components/homevolt/test_sensor.py

@@ -0,0 +1,60 @@
+"""Tests for the Homevolt sensor platform."""
+
+import pytest
+from syrupy.assertion import SnapshotAssertion
+
+from homeassistant.components.homevolt.const import DOMAIN
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers import device_registry as dr, entity_registry as er
+
+from tests.common import MockConfigEntry, snapshot_platform
+
+pytestmark = pytest.mark.usefixtures(
+    "entity_registry_enabled_by_default", "init_integration"
+)
+
+
+async def test_entities(
+    hass: HomeAssistant,
+    snapshot: SnapshotAssertion,
+    entity_registry: er.EntityRegistry,
+    device_registry: dr.DeviceRegistry,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test the sensor entities."""
+    await snapshot_platform(hass, entity_registry, snapshot, mock_config_entry.entry_id)
+
+    device_entry = device_registry.async_get_device(
+        identifiers={(DOMAIN, "40580137858664_ems_40580137858664")}
+    )
+    assert device_entry
+    entity_entries = er.async_entries_for_config_entry(
+        entity_registry, mock_config_entry.entry_id
+    )
+    for entity_entry in entity_entries:
+        assert entity_entry.device_id == device_entry.id
+
+
+async def test_sensor_exposes_values_from_coordinator(
+    hass: HomeAssistant,
+    entity_registry: er.EntityRegistry,
+    mock_config_entry: MockConfigEntry,
+    mock_homevolt_client,
+) -> None:
+    """Ensure sensor entities are created and expose values from the coordinator."""
+    unique_id = "40580137858664_L1 Voltage"
+    entity_id = entity_registry.async_get_entity_id("sensor", DOMAIN, unique_id)
+    assert entity_id is not None
+
+    state = hass.states.get(entity_id)
+    assert state is not None
+    assert float(state.state) == 234.5
+
+    mock_homevolt_client.get_device.return_value.sensors["L1 Voltage"].value = 240.1
+    coordinator = mock_config_entry.runtime_data
+    await coordinator.async_refresh()
+    await hass.async_block_till_done()
+
+    state = hass.states.get(entity_id)
+    assert state is not None
+    assert float(state.state) == 240.1