diff --git a/homeassistant/components/forecast_solar/__init__.py b/homeassistant/components/forecast_solar/__init__.py
index 760ad04af98..d4e8e3af969 100644
--- a/homeassistant/components/forecast_solar/__init__.py
+++ b/homeassistant/components/forecast_solar/__init__.py
@@ -16,6 +16,7 @@ from .const import (
     CONF_AZIMUTH,
     CONF_DAMPING,
     CONF_DECLINATION,
+    CONF_INVERTER_SIZE,
     CONF_MODULES_POWER,
     DOMAIN,
 )
@@ -29,6 +30,11 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     # this if statement is here to catch that.
     api_key = entry.options.get(CONF_API_KEY) or None
 
+    if (
+        inverter_size := entry.options.get(CONF_INVERTER_SIZE)
+    ) is not None and inverter_size > 0:
+        inverter_size = inverter_size / 1000
+
     session = async_get_clientsession(hass)
     forecast = ForecastSolar(
         api_key=api_key,
@@ -39,6 +45,7 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
         azimuth=(entry.options[CONF_AZIMUTH] - 180),
         kwp=(entry.options[CONF_MODULES_POWER] / 1000),
         damping=entry.options.get(CONF_DAMPING, 0),
+        inverter=inverter_size,
     )
 
     # Free account have a resolution of 1 hour, using that as the default
diff --git a/homeassistant/components/forecast_solar/config_flow.py b/homeassistant/components/forecast_solar/config_flow.py
index e7f41777062..86de17ef285 100644
--- a/homeassistant/components/forecast_solar/config_flow.py
+++ b/homeassistant/components/forecast_solar/config_flow.py
@@ -15,6 +15,7 @@ from .const import (
     CONF_AZIMUTH,
     CONF_DAMPING,
     CONF_DECLINATION,
+    CONF_INVERTER_SIZE,
     CONF_MODULES_POWER,
     DOMAIN,
 )
@@ -118,6 +119,14 @@ class ForecastSolarOptionFlowHandler(OptionsFlow):
                         CONF_DAMPING,
                         default=self.config_entry.options.get(CONF_DAMPING, 0.0),
                     ): vol.Coerce(float),
+                    vol.Optional(
+                        CONF_INVERTER_SIZE,
+                        description={
+                            "suggested_value": self.config_entry.options.get(
+                                CONF_INVERTER_SIZE
+                            )
+                        },
+                    ): vol.Coerce(int),
                 }
             ),
         )
diff --git a/homeassistant/components/forecast_solar/const.py b/homeassistant/components/forecast_solar/const.py
index 63d5bd10084..d9742cf5dfc 100644
--- a/homeassistant/components/forecast_solar/const.py
+++ b/homeassistant/components/forecast_solar/const.py
@@ -14,6 +14,7 @@ CONF_DECLINATION = "declination"
 CONF_AZIMUTH = "azimuth"
 CONF_MODULES_POWER = "modules power"
 CONF_DAMPING = "damping"
+CONF_INVERTER_SIZE = "inverter_size"
 
 SENSORS: tuple[ForecastSolarSensorEntityDescription, ...] = (
     ForecastSolarSensorEntityDescription(
diff --git a/homeassistant/components/forecast_solar/manifest.json b/homeassistant/components/forecast_solar/manifest.json
index dc4b88d160c..472f5cac213 100644
--- a/homeassistant/components/forecast_solar/manifest.json
+++ b/homeassistant/components/forecast_solar/manifest.json
@@ -3,7 +3,7 @@
   "name": "Forecast.Solar",
   "config_flow": true,
   "documentation": "https://www.home-assistant.io/integrations/forecast_solar",
-  "requirements": ["forecast_solar==2.1.0"],
+  "requirements": ["forecast_solar==2.2.0"],
   "codeowners": ["@klaasnicolaas", "@frenck"],
   "quality_scale": "platinum",
   "iot_class": "cloud_polling"
diff --git a/homeassistant/components/forecast_solar/strings.json b/homeassistant/components/forecast_solar/strings.json
index e1ae451a04f..b10e927eb8b 100644
--- a/homeassistant/components/forecast_solar/strings.json
+++ b/homeassistant/components/forecast_solar/strings.json
@@ -22,6 +22,7 @@
           "api_key": "Forecast.Solar API Key (optional)",
           "azimuth": "Azimuth (360 degrees, 0 = North, 90 = East, 180 = South, 270 = West)",
           "damping": "Damping factor: adjusts the results in the morning and evening",
+          "inverter_size": "Inverter size (Watt)",
           "declination": "Declination (0 = Horizontal, 90 = Vertical)",
           "modules power": "Total Watt peak power of your solar modules"
         }
diff --git a/homeassistant/components/forecast_solar/translations/en.json b/homeassistant/components/forecast_solar/translations/en.json
index f9eef2b5c0a..db9bead2e8c 100644
--- a/homeassistant/components/forecast_solar/translations/en.json
+++ b/homeassistant/components/forecast_solar/translations/en.json
@@ -21,6 +21,7 @@
                     "api_key": "Forecast.Solar API Key (optional)",
                     "azimuth": "Azimuth (360 degrees, 0 = North, 90 = East, 180 = South, 270 = West)",
                     "damping": "Damping factor: adjusts the results in the morning and evening",
+                    "inverter_size": "Inverter size (Watt)",
                     "declination": "Declination (0 = Horizontal, 90 = Vertical)",
                     "modules power": "Total Watt peak power of your solar modules"
                 },
diff --git a/requirements_all.txt b/requirements_all.txt
index 518345320fd..4047f66c811 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -658,7 +658,7 @@ fnvhash==0.1.0
 foobot_async==1.0.0
 
 # homeassistant.components.forecast_solar
-forecast_solar==2.1.0
+forecast_solar==2.2.0
 
 # homeassistant.components.fortios
 fortiosapi==1.0.5
diff --git a/requirements_test_all.txt b/requirements_test_all.txt
index 678a071db62..f1c79379eb8 100644
--- a/requirements_test_all.txt
+++ b/requirements_test_all.txt
@@ -453,7 +453,7 @@ fnvhash==0.1.0
 foobot_async==1.0.0
 
 # homeassistant.components.forecast_solar
-forecast_solar==2.1.0
+forecast_solar==2.2.0
 
 # homeassistant.components.freebox
 freebox-api==0.0.10
diff --git a/tests/components/forecast_solar/conftest.py b/tests/components/forecast_solar/conftest.py
index 408c5423861..0d9f76b367e 100644
--- a/tests/components/forecast_solar/conftest.py
+++ b/tests/components/forecast_solar/conftest.py
@@ -11,6 +11,7 @@ from homeassistant.components.forecast_solar.const import (
     CONF_AZIMUTH,
     CONF_DAMPING,
     CONF_DECLINATION,
+    CONF_INVERTER_SIZE,
     CONF_MODULES_POWER,
     DOMAIN,
 )
@@ -38,6 +39,7 @@ def mock_config_entry() -> MockConfigEntry:
             CONF_AZIMUTH: 190,
             CONF_MODULES_POWER: 5100,
             CONF_DAMPING: 0.5,
+            CONF_INVERTER_SIZE: 2000,
         },
     )
 
diff --git a/tests/components/forecast_solar/test_config_flow.py b/tests/components/forecast_solar/test_config_flow.py
index d175be986ca..f0611d1678d 100644
--- a/tests/components/forecast_solar/test_config_flow.py
+++ b/tests/components/forecast_solar/test_config_flow.py
@@ -5,6 +5,7 @@ from homeassistant.components.forecast_solar.const import (
     CONF_AZIMUTH,
     CONF_DAMPING,
     CONF_DECLINATION,
+    CONF_INVERTER_SIZE,
     CONF_MODULES_POWER,
     DOMAIN,
 )
@@ -81,6 +82,7 @@ async def test_options_flow(
             CONF_AZIMUTH: 22,
             CONF_MODULES_POWER: 2122,
             CONF_DAMPING: 0.25,
+            CONF_INVERTER_SIZE: 2000,
         },
     )
 
@@ -91,4 +93,5 @@ async def test_options_flow(
         CONF_AZIMUTH: 22,
         CONF_MODULES_POWER: 2122,
         CONF_DAMPING: 0.25,
+        CONF_INVERTER_SIZE: 2000,
     }