diff --git a/homeassistant/components/pvoutput/diagnostics.py b/homeassistant/components/pvoutput/diagnostics.py
new file mode 100644
index 00000000000..2aff3b20442
--- /dev/null
+++ b/homeassistant/components/pvoutput/diagnostics.py
@@ -0,0 +1,21 @@
+"""Diagnostics support for PVOutput."""
+from __future__ import annotations
+
+import json
+from typing import Any
+
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.core import HomeAssistant
+
+from .const import DOMAIN
+from .coordinator import PVOutputDataUpdateCoordinator
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, entry: ConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+    coordinator: PVOutputDataUpdateCoordinator = hass.data[DOMAIN][entry.entry_id]
+    # Round-trip via JSON to trigger serialization
+    data: dict[str, Any] = json.loads(coordinator.data.json())
+    return data
diff --git a/tests/components/pvoutput/test_diagnostics.py b/tests/components/pvoutput/test_diagnostics.py
new file mode 100644
index 00000000000..529e9b4e575
--- /dev/null
+++ b/tests/components/pvoutput/test_diagnostics.py
@@ -0,0 +1,28 @@
+"""Tests for the diagnostics data provided by the PVOutput integration."""
+from aiohttp import ClientSession
+
+from homeassistant.core import HomeAssistant
+
+from tests.common import MockConfigEntry
+from tests.components.diagnostics import get_diagnostics_for_config_entry
+
+
+async def test_diagnostics(
+    hass: HomeAssistant,
+    hass_client: ClientSession,
+    init_integration: MockConfigEntry,
+):
+    """Test diagnostics."""
+    assert await get_diagnostics_for_config_entry(
+        hass, hass_client, init_integration
+    ) == {
+        "energy_consumption": 1000,
+        "energy_generation": 500,
+        "normalized_output": 0.5,
+        "power_consumption": 2500,
+        "power_generation": 1500,
+        "reported_date": "2021-12-29",
+        "reported_time": "22:37:00",
+        "temperature": 20.2,
+        "voltage": 220.5,
+    }