diff --git a/homeassistant/components/goodwe/diagnostics.py b/homeassistant/components/goodwe/diagnostics.py
new file mode 100644
index 00000000000..285036c0254
--- /dev/null
+++ b/homeassistant/components/goodwe/diagnostics.py
@@ -0,0 +1,35 @@
+"""Diagnostics support for Goodwe."""
+from __future__ import annotations
+
+from typing import Any
+
+from goodwe import Inverter
+
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.core import HomeAssistant
+
+from .const import DOMAIN, KEY_INVERTER
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, config_entry: ConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+    inverter: Inverter = hass.data[DOMAIN][config_entry.entry_id][KEY_INVERTER]
+
+    diagnostics_data = {
+        "config_entry": config_entry.as_dict(),
+        "inverter": {
+            "model_name": inverter.model_name,
+            "rated_power": inverter.rated_power,
+            "firmware": inverter.firmware,
+            "arm_firmware": inverter.arm_firmware,
+            "dsp1_version": inverter.dsp1_version,
+            "dsp2_version": inverter.dsp2_version,
+            "dsp_svn_version": inverter.dsp_svn_version,
+            "arm_version": inverter.arm_version,
+            "arm_svn_version": inverter.arm_svn_version,
+        },
+    }
+
+    return diagnostics_data
diff --git a/tests/components/goodwe/conftest.py b/tests/components/goodwe/conftest.py
new file mode 100644
index 00000000000..cabb0f6ea10
--- /dev/null
+++ b/tests/components/goodwe/conftest.py
@@ -0,0 +1,25 @@
+"""Fixtures for the Aladdin Connect integration tests."""
+from unittest.mock import AsyncMock, MagicMock
+
+from goodwe import Inverter
+import pytest
+
+
+@pytest.fixture(name="mock_inverter")
+def fixture_mock_inverter():
+    """Set up inverter fixture."""
+    mock_inverter = MagicMock(spec=Inverter)
+    mock_inverter.serial_number = "dummy_serial_nr"
+    mock_inverter.arm_version = 1
+    mock_inverter.arm_svn_version = 2
+    mock_inverter.arm_firmware = "dummy.arm.version"
+    mock_inverter.firmware = "dummy.fw.version"
+    mock_inverter.model_name = "MOCK"
+    mock_inverter.rated_power = 10000
+    mock_inverter.dsp1_version = 3
+    mock_inverter.dsp2_version = 4
+    mock_inverter.dsp_svn_version = 5
+
+    mock_inverter.read_runtime_data = AsyncMock(return_value={})
+
+    return mock_inverter
diff --git a/tests/components/goodwe/snapshots/test_diagnostics.ambr b/tests/components/goodwe/snapshots/test_diagnostics.ambr
new file mode 100644
index 00000000000..f259e020cd5
--- /dev/null
+++ b/tests/components/goodwe/snapshots/test_diagnostics.ambr
@@ -0,0 +1,33 @@
+# serializer version: 1
+# name: test_entry_diagnostics
+  dict({
+    'config_entry': dict({
+      'data': dict({
+        'host': 'localhost',
+        'model_family': 'ET',
+      }),
+      'disabled_by': None,
+      'domain': 'goodwe',
+      'entry_id': '3bd2acb0e4f0476d40865546d0d91921',
+      'options': dict({
+      }),
+      'pref_disable_new_entities': False,
+      'pref_disable_polling': False,
+      'source': 'user',
+      'title': 'Mock Title',
+      'unique_id': None,
+      'version': 1,
+    }),
+    'inverter': dict({
+      'arm_firmware': 'dummy.arm.version',
+      'arm_svn_version': 2,
+      'arm_version': 1,
+      'dsp1_version': 3,
+      'dsp2_version': 4,
+      'dsp_svn_version': 5,
+      'firmware': 'dummy.fw.version',
+      'model_name': 'MOCK',
+      'rated_power': 10000,
+    }),
+  })
+# ---
diff --git a/tests/components/goodwe/test_diagnostics.py b/tests/components/goodwe/test_diagnostics.py
new file mode 100644
index 00000000000..edda2ed2cb7
--- /dev/null
+++ b/tests/components/goodwe/test_diagnostics.py
@@ -0,0 +1,34 @@
+"""Test the CO2Signal diagnostics."""
+from unittest.mock import MagicMock, patch
+
+from syrupy import SnapshotAssertion
+
+from homeassistant.components.goodwe import CONF_MODEL_FAMILY, DOMAIN
+from homeassistant.const import CONF_HOST
+from homeassistant.core import HomeAssistant
+from homeassistant.setup import async_setup_component
+
+from tests.common import MockConfigEntry
+from tests.components.diagnostics import get_diagnostics_for_config_entry
+from tests.typing import ClientSessionGenerator
+
+
+async def test_entry_diagnostics(
+    hass: HomeAssistant,
+    hass_client: ClientSessionGenerator,
+    snapshot: SnapshotAssertion,
+    mock_inverter: MagicMock,
+) -> None:
+    """Test config entry diagnostics."""
+
+    config_entry = MockConfigEntry(
+        domain=DOMAIN,
+        data={CONF_HOST: "localhost", CONF_MODEL_FAMILY: "ET"},
+        entry_id="3bd2acb0e4f0476d40865546d0d91921",
+    )
+    config_entry.add_to_hass(hass)
+    with patch("homeassistant.components.goodwe.connect", return_value=mock_inverter):
+        assert await async_setup_component(hass, DOMAIN, {})
+
+    result = await get_diagnostics_for_config_entry(hass, hass_client, config_entry)
+    assert result == snapshot