diff --git a/homeassistant/components/peblar/select.py b/homeassistant/components/peblar/select.py
index 37a4f491130c..247fc1ce83fb 100644
--- a/homeassistant/components/peblar/select.py
+++ b/homeassistant/components/peblar/select.py
@@ -44,11 +44,17 @@ def _smart_charging_options(configuration: PeblarUserConfiguration) -> list[str]
     A charger without a power meter configured rejects solar charging, and
     scheduled charging can be switched off during commissioning. Offering
     those anyway lands the user on a mode the charger quietly ignores.
+
+    Custom solar arrived with firmware 1.10. Rather than check the version,
+    take the charger at its word: it reports the settings that go with the
+    mode, and leaves them out when it has never heard of it.
     """
     solar = configuration.solar_charging_allowed
+    custom = solar and configuration.solar_charging_custom_power_target is not None
     return [
         option
         for option, allowed in (
+            ("custom_solar", custom),
             ("default", True),
             ("fast_solar", solar),
             ("pure_solar", solar),
diff --git a/homeassistant/components/peblar/strings.json b/homeassistant/components/peblar/strings.json
index afb4fccef947..bd7abf30282b 100644
--- a/homeassistant/components/peblar/strings.json
+++ b/homeassistant/components/peblar/strings.json
@@ -99,6 +99,7 @@
       "smart_charging": {
         "name": "Smart charging",
         "state": {
+          "custom_solar": "Custom solar",
           "default": "Default",
           "fast_solar": "Fast solar",
           "pure_solar": "Pure solar",
diff --git a/tests/components/peblar/fixtures/user_configuration.json b/tests/components/peblar/fixtures/user_configuration.json
index b41aecd00efa..0d9c4f70e01d 100644
--- a/tests/components/peblar/fixtures/user_configuration.json
+++ b/tests/components/peblar/fixtures/user_configuration.json
@@ -40,6 +40,9 @@
   "SeccOcppUri": "",
   "SessionManagerChargeWithoutAuth": false,
   "SolarChargingAllowed": true,
+  "SolarChargingCustomAlwaysCharge": false,
+  "SolarChargingCustomPowerTarget": 0,
+  "SolarChargingCustomPowerThreshold": -1300,
   "SolarChargingEnable": true,
   "SolarChargingMode": "PureSolar",
   "SolarChargingSource": "homewizard",
diff --git a/tests/components/peblar/snapshots/test_diagnostics.ambr b/tests/components/peblar/snapshots/test_diagnostics.ambr
index 12d671c5100c..00bb3f401f89 100644
--- a/tests/components/peblar/snapshots/test_diagnostics.ambr
+++ b/tests/components/peblar/snapshots/test_diagnostics.ambr
@@ -138,6 +138,9 @@
       'SeccOcppUri': '',
       'SessionManagerChargeWithoutAuth': False,
       'SolarChargingAllowed': True,
+      'SolarChargingCustomAlwaysCharge': False,
+      'SolarChargingCustomPowerTarget': 0,
+      'SolarChargingCustomPowerThreshold': -1300,
       'SolarChargingEnable': True,
       'SolarChargingMode': 'PureSolar',
       'SolarChargingSource': 'homewizard',
diff --git a/tests/components/peblar/snapshots/test_select.ambr b/tests/components/peblar/snapshots/test_select.ambr
index ad6634630f22..bf4b98b5b4b0 100644
--- a/tests/components/peblar/snapshots/test_select.ambr
+++ b/tests/components/peblar/snapshots/test_select.ambr
@@ -137,6 +137,7 @@
     'area_id': None,
     'capabilities': dict({
       <SelectEntityCapabilityAttribute.OPTIONS: 'options'>: list([
+        'custom_solar',
         'default',
         'fast_solar',
         'pure_solar',
@@ -179,6 +180,7 @@
     'attributes': ReadOnlyDict({
       <EntityStateAttribute.FRIENDLY_NAME: 'friendly_name'>: 'Peblar EV Charger Smart charging',
       <SelectEntityCapabilityAttribute.OPTIONS: 'options'>: list([
+        'custom_solar',
         'default',
         'fast_solar',
         'pure_solar',
diff --git a/tests/components/peblar/test_select.py b/tests/components/peblar/test_select.py
index 8c3d8b045974..2a974694e2bf 100644
--- a/tests/components/peblar/test_select.py
+++ b/tests/components/peblar/test_select.py
@@ -262,14 +262,18 @@ async def test_hw_entity_absent_when_hw_flag_false(
         ),
         (
             {"ScheduledChargingAllowed": False},
-            ["default", "fast_solar", "pure_solar", "smart_solar"],
+            ["custom_solar", "default", "fast_solar", "pure_solar", "smart_solar"],
         ),
         (
             {"SolarChargingAllowed": False, "ScheduledChargingAllowed": False},
             ["default"],
         ),
+        (
+            {"SolarChargingCustomPowerTarget": None},
+            ["default", "fast_solar", "pure_solar", "scheduled", "smart_solar"],
+        ),
     ],
-    ids=["no solar", "no scheduled", "neither"],
+    ids=["no solar", "no scheduled", "neither", "firmware without custom solar"],
     indirect=["mock_peblar"],
 )
 @pytest.mark.usefixtures("entity_registry_enabled_by_default")
@@ -281,8 +285,30 @@ async def test_smart_charging_options_follow_the_charger(
 
     A charger without a power meter rejects solar charging, and the web
     interface hides those modes. Offering them anyway lets the user pick
-    something the charger quietly ignores.
+    something the charger quietly ignores. The same goes for custom solar,
+    which firmware older than 1.10 has never heard of.
     """
     state = hass.states.get("select.peblar_ev_charger_smart_charging")
     assert state
     assert state.attributes[ATTR_OPTIONS] == expected_options
+
+
+@pytest.mark.usefixtures("entity_registry_enabled_by_default")
+async def test_selecting_custom_solar(
+    hass: HomeAssistant,
+    mock_peblar: MagicMock,
+) -> None:
+    """Test the mode firmware 1.10 added reaches the charger."""
+    mock_peblar.smart_charging.reset_mock()
+
+    await hass.services.async_call(
+        SELECT_DOMAIN,
+        SERVICE_SELECT_OPTION,
+        {
+            ATTR_ENTITY_ID: "select.peblar_ev_charger_smart_charging",
+            ATTR_OPTION: "custom_solar",
+        },
+        blocking=True,
+    )
+
+    mock_peblar.smart_charging.assert_called_once_with(SmartChargingMode.CUSTOM_SOLAR)