diff --git a/.storybook/preview.ts b/.storybook/preview.ts
index 1c51ac1cc..b38177500 100644
--- a/.storybook/preview.ts
+++ b/.storybook/preview.ts
@@ -34,7 +34,6 @@ export default {
 } satisfies Preview;
 
 setup((app) => {
-  app.config.globalProperties.$hiddenFeatures = () => true;
   app.use(setupI18n());
 
   // Mock router-link for Storybook
diff --git a/assets/js/api.ts b/assets/js/api.ts
index 86fc9ddb4..0b0287725 100644
--- a/assets/js/api.ts
+++ b/assets/js/api.ts
@@ -40,9 +40,9 @@ const errorInterceptor = (error: any) => {
     message.push(`${error.response.data.error}.`);
   }
   if (error.config) {
-    const method = error.config.method.toUpperCase();
-    const url = error.request.responseURL;
-    message.push(`${method} ${url}`);
+    const { baseURL, url, method } = error.config;
+    const fullUrl = error.request.responseURL || `${baseURL}${url}`;
+    message.push(`${method.toUpperCase()} ${fullUrl}`);
   }
   window.app.raise({ message });
   return Promise.reject(error);
diff --git a/assets/js/app.ts b/assets/js/app.ts
index ae4b1466b..f2cc4c5a4 100644
--- a/assets/js/app.ts
+++ b/assets/js/app.ts
@@ -5,7 +5,6 @@ import { VueHeadMixin, createHead } from "@unhead/vue/client";
 import App from "./views/App.vue";
 import setupRouter from "./router.ts";
 import setupI18n from "./i18n.ts";
-import featureflags from "./featureflags.ts";
 import { watchThemeChanges } from "./theme.ts";
 import { appDetection, sendToApp } from "./utils/native";
 import type { Notification } from "./types/evcc";
@@ -74,7 +73,6 @@ const head = createHead();
 
 app.use(i18n);
 app.use(setupRouter(i18n.global));
-app.use(featureflags);
 app.use(head);
 app.mixin(VueHeadMixin);
 window.app = app.mount("#app");
diff --git a/assets/js/components/Auth/PasswordModal.vue b/assets/js/components/Auth/PasswordModal.vue
index 180a3c9e1..9a6f2b1b3 100644
--- a/assets/js/components/Auth/PasswordModal.vue
+++ b/assets/js/components/Auth/PasswordModal.vue
@@ -8,7 +8,7 @@
 		@open="open"
 		@closed="closed"
 	>
-		<p v-if="error" class="text-danger">{{ $t("passwordModal.error") }} "{{ error }}"</p>
+		<ErrorMessage :error="error" />
 		<p v-if="isSetupMode" class="mb-4">{{ $t("passwordModal.description") }}</p>
 		<form
 			v-if="modalVisible"
@@ -87,6 +87,7 @@
 
 <script lang="ts">
 import GenericModal from "../Helper/GenericModal.vue";
+import ErrorMessage from "../Helper/ErrorMessage.vue";
 import FormRow from "../Helper/FormRow.vue";
 import api from "@/api";
 import { updateAuthStatus } from "./auth";
@@ -94,7 +95,7 @@ import { defineComponent } from "vue";
 
 export default defineComponent({
 	name: "PasswordModal",
-	components: { FormRow, GenericModal },
+	components: { FormRow, GenericModal, ErrorMessage },
 	props: {
 		updateMode: Boolean,
 	},
diff --git a/assets/js/components/Config/DeviceModal/DeviceModalBase.vue b/assets/js/components/Config/DeviceModal/DeviceModalBase.vue
index 27200f665..0101e114d 100644
--- a/assets/js/components/Config/DeviceModal/DeviceModalBase.vue
+++ b/assets/js/components/Config/DeviceModal/DeviceModalBase.vue
@@ -66,7 +66,7 @@
 							/>
 						</div>
 
-						<p v-if="auth.error" class="text-danger">{{ auth.error }}</p>
+						<ErrorMessage :error="auth.error" />
 
 						<div
 							class="my-4 d-flex align-items-stretch justify-content-sm-between align-items-sm-baseline flex-column-reverse flex-sm-row gap-2"
@@ -167,6 +167,7 @@
 <script lang="ts">
 import { defineComponent, type PropType } from "vue";
 import GenericModal, { type ModalFade } from "../../Helper/GenericModal.vue";
+import ErrorMessage from "../../Helper/ErrorMessage.vue";
 import PropertyEntry from "../PropertyEntry.vue";
 import PropertyCollapsible from "../PropertyCollapsible.vue";
 import Modbus from "./Modbus.vue";
@@ -203,6 +204,7 @@ export default defineComponent({
 	name: "DeviceModalBase",
 	components: {
 		GenericModal,
+		ErrorMessage,
 		PropertyEntry,
 		PropertyCollapsible,
 		Modbus,
diff --git a/assets/js/components/Config/ExperimentalModal.vue b/assets/js/components/Config/ExperimentalModal.vue
index 15e4f851e..5f53042f3 100644
--- a/assets/js/components/Config/ExperimentalModal.vue
+++ b/assets/js/components/Config/ExperimentalModal.vue
@@ -1,46 +1,56 @@
 <template>
 	<GenericModal
 		id="experimentalModal"
-		:title="$t('config.experimental.title')"
+		:title="`${$t('config.experimental.title')} 🧪`"
 		data-testid="experimental-modal"
 	>
 		<p>{{ $t("config.experimental.description") }}</p>
+		<ErrorMessage :error="error" />
 		<div class="form-check form-switch my-3">
 			<input
 				id="experimentalEnabled"
-				v-model="hiddenFeatures"
+				:checked="experimental"
 				class="form-check-input"
 				type="checkbox"
 				role="switch"
+				@change="change"
 			/>
 			<div class="form-check-label">
 				<label for="experimentalEnabled">
-					{{ $t("settings.hiddenFeatures.value") }} 🧪
+					{{ $t("settings.hiddenFeatures.value") }}
 				</label>
 			</div>
 		</div>
-		<div class="small text-muted">
-			{{ $t("settings.deviceInfo") }}
-		</div>
 	</GenericModal>
 </template>
 
 <script lang="ts">
 import { defineComponent } from "vue";
 import GenericModal from "../Helper/GenericModal.vue";
-import { getHiddenFeatures, setHiddenFeatures } from "@/featureflags.ts";
+import ErrorMessage from "../Helper/ErrorMessage.vue";
+import api from "@/api";
+import type { AxiosError } from "axios";
 
 export default defineComponent({
 	name: "ExperimentalModal",
-	components: { GenericModal },
+	components: { GenericModal, ErrorMessage },
+	props: {
+		experimental: Boolean,
+	},
 	data() {
 		return {
-			hiddenFeatures: getHiddenFeatures(),
+			error: null as string | null,
 		};
 	},
-	watch: {
-		hiddenFeatures(value) {
-			setHiddenFeatures(value);
+	methods: {
+		async change(e: Event) {
+			try {
+				this.error = null;
+				await api.post(`config/experimental/${(e.target as HTMLInputElement).checked}`);
+			} catch (err) {
+				const e = err as AxiosError<{ error: string }>;
+				this.error = e.response?.data?.error || e.message;
+			}
 		},
 	},
 });
diff --git a/assets/js/components/Config/GeneralConfig.vue b/assets/js/components/Config/GeneralConfig.vue
index c4f2a266c..70418493d 100644
--- a/assets/js/components/Config/GeneralConfig.vue
+++ b/assets/js/components/Config/GeneralConfig.vue
@@ -25,7 +25,7 @@
 		<GeneralConfigEntry
 			test-id="generalconfig-experimental"
 			:label="$t('config.general.experimental')"
-			:text="$t(`config.general.${hiddenFeatures ? 'on' : 'off'}`)"
+			:text="$t(`config.general.${experimental ? 'on' : 'off'}`)"
 			modal-id="experimentalModal"
 		/>
 
@@ -66,7 +66,6 @@
 import TitleModal from "./TitleModal.vue";
 import GeneralConfigEntry from "./GeneralConfigEntry.vue";
 import api from "@/api";
-import settings from "@/settings";
 import store from "@/store";
 import formatter from "@/mixins/formatter";
 
@@ -76,6 +75,7 @@ export default {
 	mixins: [formatter],
 	props: {
 		sponsorError: Boolean,
+		experimental: Boolean,
 	},
 	emits: ["site-changed"],
 	data() {
@@ -87,9 +87,6 @@ export default {
 		telemetryEnabled() {
 			return store.state?.telemetry === true;
 		},
-		hiddenFeatures() {
-			return settings.hiddenFeatures === true;
-		},
 		networkStatus() {
 			return `${store.state?.network?.port ?? ""}`;
 		},
diff --git a/assets/js/components/Config/YamlModal.vue b/assets/js/components/Config/YamlModal.vue
index 3459f09a3..423daecac 100644
--- a/assets/js/components/Config/YamlModal.vue
+++ b/assets/js/components/Config/YamlModal.vue
@@ -7,7 +7,7 @@
 			</a>
 		</p>
 		<slot name="afterDescription" />
-		<p v-if="error" class="text-danger" data-testid="error">{{ error }}</p>
+		<ErrorMessage :error="error" data-testid="error" />
 		<form ref="form" class="container mx-0 px-0">
 			<div v-if="!noYamlEditor" class="editor-container">
 				<YamlEditorContainer
@@ -49,13 +49,14 @@
 
 <script>
 import GenericModal from "../Helper/GenericModal.vue";
+import ErrorMessage from "../Helper/ErrorMessage.vue";
 import api from "@/api";
 import { docsPrefix } from "@/i18n";
 import YamlEditorContainer from "./YamlEditorContainer.vue";
 
 export default {
 	name: "YamlModal",
-	components: { GenericModal, YamlEditorContainer },
+	components: { GenericModal, ErrorMessage, YamlEditorContainer },
 	props: {
 		title: String,
 		description: String,
diff --git a/assets/js/components/Energyflow/Energyflow.vue b/assets/js/components/Energyflow/Energyflow.vue
index 09cb851af..740c07046 100644
--- a/assets/js/components/Energyflow/Energyflow.vue
+++ b/assets/js/components/Energyflow/Energyflow.vue
@@ -333,6 +333,7 @@ export default defineComponent({
 	mixins: [formatter, collector],
 	props: {
 		gridConfigured: Boolean,
+		experimental: Boolean,
 		gridPower: { type: Number, default: 0 },
 		homePower: { type: Number, default: 0 },
 		pvConfigured: Boolean,
@@ -510,7 +511,7 @@ export default defineComponent({
 				return undefined;
 			}
 			const { today, scale } = this.forecast.solar || {};
-			const factor = this.$hiddenFeatures() && settings.solarAdjusted && scale ? scale : 1;
+			const factor = this.experimental && settings.solarAdjusted && scale ? scale : 1;
 			const energy = today?.energy || 0;
 			return energy * factor;
 		},
diff --git a/assets/js/components/Forecast/ForecastModal.vue b/assets/js/components/Forecast/ForecastModal.vue
index 417a4eefe..e5752a247 100644
--- a/assets/js/components/Forecast/ForecastModal.vue
+++ b/assets/js/components/Forecast/ForecastModal.vue
@@ -77,6 +77,7 @@ export default defineComponent({
 	props: {
 		forecast: { type: Object as PropType<Forecast>, default: () => ({}) },
 		currency: { type: String as PropType<CURRENCY> },
+		experimental: Boolean,
 	},
 	data(): {
 		isModalVisible: boolean;
@@ -94,7 +95,7 @@ export default defineComponent({
 			return settings.solarAdjusted;
 		},
 		showSolarAdjust() {
-			return !!this.forecast.solar && this.$hiddenFeatures();
+			return !!this.forecast.solar && this.experimental;
 		},
 		solar() {
 			return this.showSolarAdjust && this.solarAdjusted
diff --git a/assets/js/components/Helper/ErrorMessage.vue b/assets/js/components/Helper/ErrorMessage.vue
new file mode 100644
index 000000000..0bc708144
--- /dev/null
+++ b/assets/js/components/Helper/ErrorMessage.vue
@@ -0,0 +1,19 @@
+<template>
+	<p v-if="error" class="text-danger text-break">
+		<strong>{{ $t("config.general.error") }}:</strong> {{ error }}
+	</p>
+</template>
+
+<script lang="ts">
+import { defineComponent, type PropType } from "vue";
+
+export default defineComponent({
+	name: "ErrorMessage",
+	props: {
+		error: {
+			type: String as PropType<string | null>,
+			default: null,
+		},
+	},
+});
+</script>
diff --git a/assets/js/components/Site/Site.vue b/assets/js/components/Site/Site.vue
index 4ca7070ac..b74554243 100644
--- a/assets/js/components/Site/Site.vue
+++ b/assets/js/components/Site/Site.vue
@@ -163,6 +163,7 @@ export default defineComponent({
 		forecast: Object as PropType<Forecast>,
 		circuits: Object as PropType<Record<string, Circuit>>,
 		telemetry: Boolean,
+		experimental: Boolean,
 		evopt: { type: Object as PropType<EvOpt> },
 	},
 	computed: {
diff --git a/assets/js/components/TelemetrySettings.vue b/assets/js/components/TelemetrySettings.vue
index ad21a9af3..edd63ccf6 100644
--- a/assets/js/components/TelemetrySettings.vue
+++ b/assets/js/components/TelemetrySettings.vue
@@ -1,5 +1,5 @@
-<!-- eslint-disable vue/no-v-html -->
 <template>
+	<ErrorMessage :error="error" />
 	<div class="form-check form-switch my-3">
 		<input
 			id="telemetryEnabled"
@@ -25,27 +25,20 @@
 				</i18n-t>
 				<span v-else>{{ $t("footer.telemetry.optInSponsorship") }}</span>
 			</label>
-			<div v-if="error" class="errorMessage my-1 text-danger" v-html="error" />
 		</div>
 	</div>
 </template>
 
 <script lang="ts">
 import { defineComponent } from "vue";
+import ErrorMessage from "./Helper/ErrorMessage.vue";
 import api from "../api";
 import { docsPrefix } from "../i18n";
 import type { AxiosError } from "axios";
 
-function parseMarkdown(markdownText: string) {
-	const htmlText = markdownText
-		.replace(/\*\*(.*)\*\*/gim, "<b>$1</b>")
-		.replace(/\*(.*)\*/gim, "<i>$1</i>")
-		.replace(/`(.*)`/gim, "<pre>$1</pre>");
-	return htmlText.trim();
-}
-
 export default defineComponent({
 	name: "TelemetrySettings",
+	components: { ErrorMessage },
 	props: { sponsorActive: Boolean, telemetry: Boolean },
 	data() {
 		return {
@@ -64,9 +57,7 @@ export default defineComponent({
 				await api.post(`settings/telemetry/${(e.target as HTMLInputElement).checked}`);
 			} catch (err) {
 				const e = err as AxiosError<{ error: string }>;
-				if (e.response) {
-					this.error = parseMarkdown("**Error:** " + e.response.data.error);
-				}
+				this.error = e.response?.data?.error || e.message;
 			}
 		},
 	},
@@ -79,8 +70,4 @@ export default defineComponent({
 .form-check-label {
 	max-width: 100%;
 }
-.errorMessage :deep(pre) {
-	text-overflow: ellipsis;
-	font-size: 1em;
-}
 </style>
diff --git a/assets/js/components/Top/Navigation.vue b/assets/js/components/Top/Navigation.vue
index 4d96f23db..3aa5e9443 100644
--- a/assets/js/components/Top/Navigation.vue
+++ b/assets/js/components/Top/Navigation.vue
@@ -166,6 +166,7 @@ export default defineComponent({
 		battery: { type: Object as PropType<Battery> },
 		evopt: { type: Object as PropType<EvOpt>, required: false },
 		fatal: { type: Array as PropType<FatalError[]>, default: () => [] },
+		experimental: Boolean,
 	},
 	emits: ["auth-required"],
 	data() {
@@ -213,7 +214,7 @@ export default defineComponent({
 			return grid || solar || co2;
 		},
 		optimizeAvailable() {
-			return !!this.evopt && this.$hiddenFeatures();
+			return !!this.evopt && this.experimental;
 		},
 		showLogout() {
 			return isLoggedIn();
diff --git a/assets/js/featureflags.ts b/assets/js/featureflags.ts
deleted file mode 100644
index 784e02bd9..000000000
--- a/assets/js/featureflags.ts
+++ /dev/null
@@ -1,16 +0,0 @@
-import type { App } from "vue";
-import settings from "./settings";
-
-export function setHiddenFeatures(value: boolean) {
-  settings.hiddenFeatures = value;
-}
-
-export function getHiddenFeatures() {
-  return settings.hiddenFeatures;
-}
-
-export default {
-  install: (app: App) => {
-    app.config.globalProperties.$hiddenFeatures = getHiddenFeatures;
-  },
-};
diff --git a/assets/js/settings.ts b/assets/js/settings.ts
index 0903dc122..3d2d45c90 100644
--- a/assets/js/settings.ts
+++ b/assets/js/settings.ts
@@ -6,7 +6,6 @@ const SETTINGS_LOCALE = "settings_locale";
 const SETTINGS_THEME = "settings_theme";
 const SETTINGS_UNIT = "settings_unit";
 const SETTINGS_12H_FORMAT = "settings_12h_format";
-const SETTINGS_HIDDEN_FEATURES = "settings_hidden_features";
 const SETTINGS_ENERGYFLOW_DETAILS = "settings_energyflow_details";
 const SETTINGS_ENERGYFLOW_CO2 = "settings_energyflow_co2";
 const SETTINGS_ENERGYFLOW_PV = "settings_energyflow_pv";
@@ -108,7 +107,6 @@ export interface Settings {
   theme: THEME | null;
   unit: string;
   is12hFormat: boolean;
-  hiddenFeatures: boolean;
   energyflowDetails: boolean;
   energyflowCo2: boolean;
   energyflowPv: boolean;
@@ -133,7 +131,6 @@ const settings: Settings = reactive({
   theme: read(SETTINGS_THEME),
   unit: read(SETTINGS_UNIT),
   is12hFormat: readBool(SETTINGS_12H_FORMAT),
-  hiddenFeatures: readBool(SETTINGS_HIDDEN_FEATURES),
   energyflowDetails: readBool(SETTINGS_ENERGYFLOW_DETAILS),
   energyflowCo2: readBool(SETTINGS_ENERGYFLOW_CO2),
   energyflowPv: readBool(SETTINGS_ENERGYFLOW_PV),
@@ -157,7 +154,6 @@ watch(() => settings.locale, save(SETTINGS_LOCALE));
 watch(() => settings.theme, save(SETTINGS_THEME));
 watch(() => settings.unit, save(SETTINGS_UNIT));
 watch(() => settings.is12hFormat, saveBool(SETTINGS_12H_FORMAT));
-watch(() => settings.hiddenFeatures, saveBool(SETTINGS_HIDDEN_FEATURES));
 watch(() => settings.energyflowDetails, saveBool(SETTINGS_ENERGYFLOW_DETAILS));
 watch(() => settings.energyflowCo2, saveBool(SETTINGS_ENERGYFLOW_CO2));
 watch(() => settings.energyflowPv, saveBool(SETTINGS_ENERGYFLOW_PV));
diff --git a/assets/js/types/evcc.ts b/assets/js/types/evcc.ts
index 6175b9995..6e1aee448 100644
--- a/assets/js/types/evcc.ts
+++ b/assets/js/types/evcc.ts
@@ -60,6 +60,8 @@ export interface FatalError {
 
 export interface State {
   offline: boolean;
+  telemetry?: boolean;
+  experimental?: boolean;
   setupRequired?: boolean;
   startupCompleted?: boolean;
   loadpoints: Loadpoint[];
diff --git a/assets/js/types/vue.d.ts b/assets/js/types/vue.d.ts
index 810550945..ce2b4ab6c 100644
--- a/assets/js/types/vue.d.ts
+++ b/assets/js/types/vue.d.ts
@@ -3,10 +3,6 @@ import type { ComponentCustomProperties } from "vue";
 
 declare module "vue" {
   interface ComponentCustomProperties {
-    /**
-     * Whether experimental UI features should be shown.
-     */
-    $hiddenFeatures: () => boolean;
     $refs: { [key: string]: HTMLElement | undefined };
   }
 }
diff --git a/assets/js/views/Config.vue b/assets/js/views/Config.vue
index 465abf9a0..ddb1fd2c2 100644
--- a/assets/js/views/Config.vue
+++ b/assets/js/views/Config.vue
@@ -16,6 +16,7 @@
 
 				<h2 class="my-4 mt-5">{{ $t("config.section.general") }}</h2>
 				<GeneralConfig
+					:experimental="experimental"
 					:sponsor-error="hasClassError('sponsorship')"
 					@site-changed="siteChanged"
 				/>
@@ -371,7 +372,7 @@
 				<MessagingModal @changed="yamlChanged" />
 				<TariffsModal @changed="yamlChanged" />
 				<TelemetryModal :sponsor="sponsor" :telemetry="telemetry" />
-				<ExperimentalModal />
+				<ExperimentalModal :experimental="experimental" />
 				<ModbusProxyModal :is-sponsor="isSponsor" @changed="loadDirty" />
 				<CircuitsModal
 					:gridMeter="gridMeter"
@@ -684,8 +685,10 @@ export default defineComponent({
 			return store.state?.ocpp;
 		},
 		telemetry() {
-			// @ts-expect-error: telemetry property exists but not in TypeScript definitions
-			return store.state?.telemetry === true;
+			return store.state?.telemetry;
+		},
+		experimental() {
+			return store.state?.experimental;
 		},
 		eebus() {
 			return store.state?.eebus;
diff --git a/assets/js/views/Issue.vue b/assets/js/views/Issue.vue
index bec26480f..9243d9461 100644
--- a/assets/js/views/Issue.vue
+++ b/assets/js/views/Issue.vue
@@ -533,12 +533,14 @@ export default defineComponent({
 				}
 
 				// read essential config data from state
-				["modbusproxy", "mqtt", "influx", "shm", "interval"].forEach((key) => {
-					const value = store.state[key as keyof State];
-					if (value) {
-						configs[key] = value;
+				["modbusproxy", "mqtt", "influx", "shm", "interval", "experimental"].forEach(
+					(key) => {
+						const value = store.state[key as keyof State];
+						if (value !== undefined && value !== null) {
+							configs[key] = value;
+						}
 					}
-				});
+				);
 
 				this.sections.uiConfig.content = formatJson(configs, EXPAND_KEYS);
 			} catch (error) {
diff --git a/cmd/root.go b/cmd/root.go
index bbf6cc789..99b3f91bb 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -378,6 +378,7 @@ func runRoot(cmd *cobra.Command, args []string) {
 	valueChan <- util.Param{Key: keys.Database, Val: db.FilePath}
 	valueChan <- util.Param{Key: keys.System, Val: util.System()}
 	valueChan <- util.Param{Key: keys.Timezone, Val: time.Now().Format("MST -07:00")}
+	valueChan <- util.Param{Key: keys.Experimental, Val: isExperimental()}
 
 	// run shutdown functions on stop
 	var once sync.Once
@@ -427,7 +428,7 @@ func runRoot(cmd *cobra.Command, args []string) {
 		site.DumpConfig()
 		site.Prepare(valueChan, pushChan)
 
-		httpd.RegisterSiteHandlers(site, valueChan)
+		httpd.RegisterSiteHandlers(site)
 
 		go func() {
 			site.Run(stopC, conf.Interval)
diff --git a/cmd/setup.go b/cmd/setup.go
index 3ee232e75..d3d0e33fc 100644
--- a/cmd/setup.go
+++ b/cmd/setup.go
@@ -1175,3 +1175,9 @@ func configureAuth(router *mux.Router, paramC chan<- util.Param) {
 	// wire the handler
 	providerauth.Setup(auth, paramC)
 }
+
+// isExperimental returns if experimental features are enabled
+func isExperimental() bool {
+	b, _ := settings.Bool(keys.Experimental)
+	return b
+}
diff --git a/core/keys/global.go b/core/keys/global.go
index 22e4edb2d..77b46a651 100644
--- a/core/keys/global.go
+++ b/core/keys/global.go
@@ -2,6 +2,7 @@ package keys
 
 const (
 	Interval           = "interval"
+	Experimental       = "experimental"
 	PasswordConfigured = "passwordConfigured"
 	Sponsor            = "sponsor"
 	SponsorToken       = "sponsorToken"
diff --git a/i18n/bg.json b/i18n/bg.json
index 08216a8b5..5c2edd710 100644
--- a/i18n/bg.json
+++ b/i18n/bg.json
@@ -1111,7 +1111,6 @@
   "passwordModal": {
     "description": "Задайте парола за защита на настройките на конфигурацията. Използването на основния екран е възможно и без влизане в системата.",
     "empty": "Паролата не трябва да бъде празна",
-    "error": "Грешка: ",
     "labelCurrent": "Текуща парола",
     "labelNew": "Нова парола",
     "labelRepeat": "Повторете паролата",
diff --git a/i18n/cs.json b/i18n/cs.json
index e23116553..9b62a72a2 100644
--- a/i18n/cs.json
+++ b/i18n/cs.json
@@ -1116,7 +1116,6 @@
   "passwordModal": {
     "description": "Nastavte heslo pro zabezpečení konfiguračního menu. Obrazovka přehledu bude stále dostupná i bez ověření heslem.",
     "empty": "Heslo nesmí být prázdné",
-    "error": "Chyba: ",
     "labelCurrent": "Současné heslo",
     "labelNew": "Nové heslo",
     "labelRepeat": "Opakujte heslo",
diff --git a/i18n/da.json b/i18n/da.json
index 577cd8d59..a5d00bd63 100644
--- a/i18n/da.json
+++ b/i18n/da.json
@@ -1118,7 +1118,6 @@
   "passwordModal": {
     "description": "Angiv adgangskode for at beskytte konfigurations indstillinger. Det er stadig mulig at benytte hovedskærmen uden at logge på.",
     "empty": "Adgangskode må ikke være tomt",
-    "error": "Fejl: ",
     "labelCurrent": "Nuværende adgangskode",
     "labelNew": "Ny adgangskode",
     "labelRepeat": "Gentag adgangskoden",
diff --git a/i18n/de.json b/i18n/de.json
index b0d9ce300..702976c9c 100644
--- a/i18n/de.json
+++ b/i18n/de.json
@@ -192,7 +192,7 @@
       "title": "EEBus"
     },
     "experimental": {
-      "description": "Aktiviert die Benutzeroberfläche für Funktionen, die sich noch in der Testphase befinden und sich in zukünftigen Versionen ändern können.",
+      "description": "Bietet frühzeitigen Zugriff auf Funktionen, die sich noch in der Testphase befinden. Diese können instabil sein und in zukünftigen Versionen geändert oder entfernt werden.",
       "title": "Experimentell"
     },
     "ext": {
@@ -223,6 +223,7 @@
       "dragHandle": "Verschieben",
       "dragItem": "Verschiebbar: {title}",
       "dragList": "Sortierbare Liste",
+      "error": "Fehler",
       "experimental": "Experimentell",
       "forceSave": "Trotzdem speichern",
       "fromYamlHint": "Hinweis: Konfiguriert über evcc.yaml. Entferne den Eintrag aus der Datei, um die Bearbeitung hier zu aktivieren.",
@@ -1124,7 +1125,6 @@
   "passwordModal": {
     "description": "Setze ein Passwort, um die Konfiguration zu schützen. Die Hauptansicht bleibt ohne Login zugänglich.",
     "empty": "Passwort darf nicht leer sein",
-    "error": "Fehler: ",
     "labelCurrent": "Aktuelles Passwort",
     "labelNew": "Neues Passwort",
     "labelRepeat": "Neues Passwort wiederholen",
@@ -1238,7 +1238,7 @@
     },
     "hiddenFeatures": {
       "label": "Experimentell",
-      "value": "Experimentelle Funktionen anzeigen."
+      "value": "Experimentelle Funktionen aktivieren."
     },
     "language": {
       "auto": "Automatisch",
diff --git a/i18n/el.json b/i18n/el.json
index 573221b19..8a1e9bdc4 100644
--- a/i18n/el.json
+++ b/i18n/el.json
@@ -1116,7 +1116,6 @@
   "passwordModal": {
     "description": "Ορίστε έναν κωδικό πρόσβασης για την προστασία των ρυθμίσεων διαμόρφωσης. Η χρήση της κύριας οθόνης εξακολουθεί να είναι δυνατή χωρίς σύνδεση.",
     "empty": "Ο κωδικός πρόσβασης δεν πρέπει να είναι κενός",
-    "error": "Σφάλμα: ",
     "labelCurrent": "Τρέχων κωδικός",
     "labelNew": "Νέος κωδικός",
     "labelRepeat": "Επανάληψη κωδικού",
diff --git a/i18n/en.json b/i18n/en.json
index ac1cfc274..92ff001be 100644
--- a/i18n/en.json
+++ b/i18n/en.json
@@ -192,7 +192,7 @@
       "title": "EEBus"
     },
     "experimental": {
-      "description": "Enable user interface for features that are still being tested and may change in future versions.",
+      "description": "Provides early access to features that are still being tested. These may be unstable and could change or be removed in future versions.",
       "title": "Experimental"
     },
     "ext": {
@@ -223,6 +223,7 @@
       "dragHandle": "Drag handle",
       "dragItem": "Draggable: {title}",
       "dragList": "Reorderable list",
+      "error": "Error",
       "experimental": "Experimental",
       "forceSave": "Save anyway",
       "fromYamlHint": "Note: Configured via evcc.yaml. Remove the entry from the file to enable editing here.",
@@ -1124,7 +1125,6 @@
   "passwordModal": {
     "description": "Set a password to protect the configuration settings. Using the main screen is still possible without login.",
     "empty": "Password should not be empty",
-    "error": "Error: ",
     "labelCurrent": "Current password",
     "labelNew": "New password",
     "labelRepeat": "Repeat password",
@@ -1238,7 +1238,7 @@
     },
     "hiddenFeatures": {
       "label": "Experimental",
-      "value": "Show experimental features."
+      "value": "Enable experimental features."
     },
     "language": {
       "auto": "Automatic",
diff --git a/i18n/es.json b/i18n/es.json
index 779787a43..94c43307a 100644
--- a/i18n/es.json
+++ b/i18n/es.json
@@ -1111,7 +1111,6 @@
   "passwordModal": {
     "description": "Establezca una contraseña para proteger los ajustes de configuración. Se puede seguir utilizando la pantalla principal sin necesidad de iniciar sesión.",
     "empty": "La contraseña no debe estar vacía",
-    "error": "Error: ",
     "labelCurrent": "Contraseña actual",
     "labelNew": "Nueva contraseña",
     "labelRepeat": "Repita la contraseña",
diff --git a/i18n/fi.json b/i18n/fi.json
index 53ea68b59..454da7930 100644
--- a/i18n/fi.json
+++ b/i18n/fi.json
@@ -1117,7 +1117,6 @@
   "passwordModal": {
     "description": "Aseta salasana suojellaksesi määritys asetuksia. Pääikkunan käyttö on silti mahdollista ilman kirjautumista.",
     "empty": "Salasana ei tulisi olla tyhjä",
-    "error": "Virhe: ",
     "labelCurrent": "Nykyinen salasana",
     "labelNew": "Uusi salasana",
     "labelRepeat": "Toista salasana",
diff --git a/i18n/fr.json b/i18n/fr.json
index 60267322f..a5499cb0c 100644
--- a/i18n/fr.json
+++ b/i18n/fr.json
@@ -1117,7 +1117,6 @@
   "passwordModal": {
     "description": "Configurez un mot de passe pour protéger la configuration. L’utilisation de l’écran principal et toujours possible sans authentification.",
     "empty": "Le mot de passe ne doit pas être vide",
-    "error": "Erreur : ",
     "labelCurrent": "Mot de passe actuel",
     "labelNew": "Nouveau mot de passe",
     "labelRepeat": "Répétez le mot de passe",
diff --git a/i18n/hr.json b/i18n/hr.json
index c6c412457..b7536b52b 100644
--- a/i18n/hr.json
+++ b/i18n/hr.json
@@ -1117,7 +1117,6 @@
   "passwordModal": {
     "description": "Postavite lozinku za zaštitu postavki. Početna stranica se može koristiti i bez prijave.",
     "empty": "Lozinka ne bi trebala biti prazna",
-    "error": "Greška: ",
     "labelCurrent": "Trenutna lozinka",
     "labelNew": "Nova lozinka",
     "labelRepeat": "Ponovite lozinku",
diff --git a/i18n/hu.json b/i18n/hu.json
index 5628d7c4a..1e1a5e036 100644
--- a/i18n/hu.json
+++ b/i18n/hu.json
@@ -1116,7 +1116,6 @@
   "passwordModal": {
     "description": "Állítson be egy jelszót a konfigurációs beállítások védelmére. A főképernyő használata továbbra is lehetséges bejelentkezés nélkül.",
     "empty": "A jelszó nem lehet üres",
-    "error": "Hiba: ",
     "labelCurrent": "Jelenlegi jelszó",
     "labelNew": "Új jelszó",
     "labelRepeat": "Jelszó megismétlése",
diff --git a/i18n/it.json b/i18n/it.json
index dc6fa78a6..d76d38338 100644
--- a/i18n/it.json
+++ b/i18n/it.json
@@ -1111,7 +1111,6 @@
   "passwordModal": {
     "description": "Imposta una password per proteggere le impostazioni di configurazione. È comunque possibile utilizzare la schermata principale senza effettuare il login.",
     "empty": "La password non deve essere vuota",
-    "error": "Errore: ",
     "labelCurrent": "Password attuale",
     "labelNew": "Nuova password",
     "labelRepeat": "Ripeti la password",
diff --git a/i18n/lb.json b/i18n/lb.json
index 638b319f6..5a5fd4cb7 100644
--- a/i18n/lb.json
+++ b/i18n/lb.json
@@ -1116,7 +1116,6 @@
   "passwordModal": {
     "description": "Definéiert e Passwuert fir d'Konfiguratiounsastellungen ze schützen. Et kann een den Haaptbildschierm och ouni Login nach ëmmer benotzen.",
     "empty": "Passwuert duerf net eidel sinn",
-    "error": "Feeler: ",
     "labelCurrent": "Aktuellt Passwuert",
     "labelNew": "Neit Passwuert",
     "labelRepeat": "Neit Passwuert widderhuelen",
diff --git a/i18n/lt.json b/i18n/lt.json
index 74635f368..5156e582f 100644
--- a/i18n/lt.json
+++ b/i18n/lt.json
@@ -1118,7 +1118,6 @@
   "passwordModal": {
     "description": "Nustatykite slaptažodį konfigūracijos apsaugai. Pagrindiniu ekranu galima naudotis ir neprisijungus.",
     "empty": "Slaptažodis negali būti tuščias",
-    "error": "Klaida: ",
     "labelCurrent": "Dabartinis slaptažodis",
     "labelNew": "Naujas slaptažodis",
     "labelRepeat": "Pakartoti slaptažodį",
diff --git a/i18n/nl.json b/i18n/nl.json
index 696605eb0..2b5dab846 100644
--- a/i18n/nl.json
+++ b/i18n/nl.json
@@ -1117,7 +1117,6 @@
   "passwordModal": {
     "description": "Stel een wachtwoord in voor het afschermen van de instellingen. Het hoofdscherm blijft beschikbaar zonder wachtwoord.",
     "empty": "Wachtwoord mag niet leeg zijn",
-    "error": "Fout: ",
     "labelCurrent": "Huidig wachtwoord",
     "labelNew": "Nieuw wachtwoord",
     "labelRepeat": "Wachtwoord herhalen",
diff --git a/i18n/no.json b/i18n/no.json
index 3f1b657f5..ff7b4008c 100644
--- a/i18n/no.json
+++ b/i18n/no.json
@@ -1108,7 +1108,6 @@
   "passwordModal": {
     "description": "Angi et passord for å beskytte konfigurasjonsinnstillingene. Det er fortsatt mulig å bruke hovedskjermen uten å logge inn.",
     "empty": "Passordet må ikke være tomt",
-    "error": "Feil: ",
     "labelCurrent": "Gjeldende passord",
     "labelNew": "Nytt passord",
     "labelRepeat": "Gjenta passord",
diff --git a/i18n/pl.json b/i18n/pl.json
index 4354d8fac..af6aa162d 100644
--- a/i18n/pl.json
+++ b/i18n/pl.json
@@ -1109,7 +1109,6 @@
   "passwordModal": {
     "description": "Ustaw hasło, aby chronić ustawienia konfiguracji. Korzystanie z ekranu głównego jest nadal możliwe bez logowania.",
     "empty": "Hasło nie powinno być puste",
-    "error": "Błąd: ",
     "labelCurrent": "Aktualne hasło",
     "labelNew": "Nowe hasło",
     "labelRepeat": "Powtórz hasło",
diff --git a/i18n/pt.json b/i18n/pt.json
index 520f32899..6932b792c 100644
--- a/i18n/pt.json
+++ b/i18n/pt.json
@@ -1116,7 +1116,6 @@
   "passwordModal": {
     "description": "Defina uma Palavra-passe para proteger as definições de configuração. Continua a ser possível utilizar o menu principal sem iniciar sessão.",
     "empty": "A Palavra-passe não deve ficar por preencher",
-    "error": "Erro: ",
     "labelCurrent": "Palavra-passe atual",
     "labelNew": "Nova Palavra-passe",
     "labelRepeat": "Repetir palavra-passe",
diff --git a/i18n/ro.json b/i18n/ro.json
index cb41b14b1..2c7f928be 100644
--- a/i18n/ro.json
+++ b/i18n/ro.json
@@ -1108,7 +1108,6 @@
   "passwordModal": {
     "description": "Setați o parolă pentru a proteja setările de configurare. Utilizarea ecranului principal este în continuare posibilă fără autentificare.",
     "empty": "Parola nu trebuie să fie goală",
-    "error": "Eroare: ",
     "labelCurrent": "Parola actuală",
     "labelNew": "Parolă nouă",
     "labelRepeat": "Repetați parola",
diff --git a/i18n/ru.json b/i18n/ru.json
index 06868aaa8..398774067 100644
--- a/i18n/ru.json
+++ b/i18n/ru.json
@@ -1107,7 +1107,6 @@
   "passwordModal": {
     "description": "Установите пароль для защиты настроек конфигурации. Использование главного экрана по-прежнему возможно без входа в систему.",
     "empty": "Пароль не должен быть пустым",
-    "error": "Ошибка: ",
     "labelCurrent": "Текущий пароль",
     "labelNew": "Новый пароль",
     "labelRepeat": "Повторите пароль",
diff --git a/i18n/sl.json b/i18n/sl.json
index 1ba021b13..94a9b85ac 100644
--- a/i18n/sl.json
+++ b/i18n/sl.json
@@ -1121,7 +1121,6 @@
   "passwordModal": {
     "description": "Nastavite geslo za zaščito konfiguracijskih nastavitev. Uporaba glavnega vmesnika je še vedno možna brez prijave.",
     "empty": "Geslo ne sme biti prazno",
-    "error": "Napaka: ",
     "labelCurrent": "Trenutno geslo",
     "labelNew": "Novo geslo",
     "labelRepeat": "Ponovi geslo",
diff --git a/i18n/sv.json b/i18n/sv.json
index e48850614..41dc9de47 100644
--- a/i18n/sv.json
+++ b/i18n/sv.json
@@ -1118,7 +1118,6 @@
   "passwordModal": {
     "description": "Använd lösenord för att skydda inställningarna. Huvudskärmen kan användas utan att logga in.",
     "empty": "Lösenordet får inte vara tomt",
-    "error": "Fel: ",
     "labelCurrent": "Nuvarande lösenord",
     "labelNew": "Nytt lösenord",
     "labelRepeat": "Upprepa lösenord",
diff --git a/i18n/ta.json b/i18n/ta.json
index 26206c1f1..3eac9a378 100644
--- a/i18n/ta.json
+++ b/i18n/ta.json
@@ -895,7 +895,6 @@
   "passwordModal": {
     "description": "உள்ளமைவு அமைப்புகளைப் பாதுகாக்க கடவுச்சொல்லை அமைக்கவும். உள்நுழைவு இல்லாமல் முதன்மையான திரையைப் பயன்படுத்துவது இன்னும் சாத்தியமாகும்.",
     "empty": "கடவுச்சொல் காலியாக இருக்கக்கூடாது",
-    "error": "பிழை: ",
     "labelCurrent": "தற்போதைய கடவுச்சொல்",
     "labelNew": "புதிய கடவுச்சொல்",
     "labelRepeat": "கடவுச்சொல்லை மீண்டும்",
diff --git a/i18n/tr.json b/i18n/tr.json
index 9f758d5d5..fca4c76a1 100644
--- a/i18n/tr.json
+++ b/i18n/tr.json
@@ -1116,7 +1116,6 @@
   "passwordModal": {
     "description": "Yapılandırma ayarlarını korumak için bir şifre belirle. Ana görünüme erişim oturum açmadan da mümkün.",
     "empty": "Şifre boş olamaz",
-    "error": "Hata: ",
     "labelCurrent": "Mevcut şifre",
     "labelNew": "Yeni şifre",
     "labelRepeat": "Yeni şifreyi tekrarla",
diff --git a/i18n/uk.json b/i18n/uk.json
index 3951fbe44..a60e046d3 100644
--- a/i18n/uk.json
+++ b/i18n/uk.json
@@ -1118,7 +1118,6 @@
   "passwordModal": {
     "description": "Встановіть пароль для захисту параметрів конфігурації. Використання головного екрана все ще можливо без входу.",
     "empty": "Пароль не повинен бути порожнім",
-    "error": "Помилка: ",
     "labelCurrent": "Поточний пароль",
     "labelNew": "Новий пароль",
     "labelRepeat": "Повторіть пароль",
diff --git a/i18n/zh-Hans.json b/i18n/zh-Hans.json
index d8f2a648f..14a023143 100644
--- a/i18n/zh-Hans.json
+++ b/i18n/zh-Hans.json
@@ -849,7 +849,6 @@
   "passwordModal": {
     "description": "设置密码以保护配置设置。主屏幕仍可在未登录情况下使用。",
     "empty": "密码不能为空",
-    "error": "错误： ",
     "labelCurrent": "当前密码",
     "labelNew": "新密码",
     "labelRepeat": "重复新密码",
diff --git a/server/http.go b/server/http.go
index c42e2ec92..5f59177cd 100644
--- a/server/http.go
+++ b/server/http.go
@@ -120,7 +120,7 @@ func (s *HTTPd) Router() *mux.Router {
 }
 
 // RegisterSiteHandlers connects the http handlers to the site
-func (s *HTTPd) RegisterSiteHandlers(site site.API, valueChan chan<- util.Param) {
+func (s *HTTPd) RegisterSiteHandlers(site site.API) {
 	router := s.Server.Handler.(*mux.Router)
 
 	// api
@@ -293,6 +293,7 @@ func (s *HTTPd) RegisterSystemHandler(site *core.Site, pub publisher, cache *uti
 			"interval":           {"POST", "/interval/{value:[0-9.]+}", settingsSetDurationHandler(keys.Interval, pub)},
 			"updatesponsortoken": {"POST", "/sponsortoken", updateSponsortokenHandler(pub)},
 			"deletesponsortoken": {"DELETE", "/sponsortoken", deleteSponsorTokenHandler(pub)},
+			"experimental":       {"POST", "/experimental/{value:[01truefalse]+}", boolHandler(setExperimental(pub), getExperimental)},
 		}
 
 		// yaml handlers
diff --git a/server/http_config_site_other_handler.go b/server/http_config_site_other_handler.go
index c6dd55f37..ce6a8721a 100644
--- a/server/http_config_site_other_handler.go
+++ b/server/http_config_site_other_handler.go
@@ -10,6 +10,19 @@ import (
 	"github.com/evcc-io/evcc/util/sponsor"
 )
 
+func setExperimental(pub publisher) func(bool) error {
+	return func(b bool) error {
+		settings.SetBool(keys.Experimental, b)
+		pub(keys.Experimental, b)
+		return nil
+	}
+}
+
+func getExperimental() bool {
+	b, _ := settings.Bool(keys.Experimental)
+	return b
+}
+
 func updateSponsortokenHandler(pub publisher) func(w http.ResponseWriter, r *http.Request) {
 	return func(w http.ResponseWriter, r *http.Request) {
 		var req struct {
diff --git a/tests/config.spec.ts b/tests/config.spec.ts
index 0657edd4e..2295abe7c 100644
--- a/tests/config.spec.ts
+++ b/tests/config.spec.ts
@@ -62,6 +62,32 @@ test.describe("general", async () => {
     await page.getByTestId("home-link").click();
     await expect(page.getByRole("heading", { name: "Ahoy World" })).toBeVisible();
   });
+  test("enable experimental", async ({ page }) => {
+    await page.goto("/#/config");
+
+    const experimentalEntry = page.getByTestId("generalconfig-experimental");
+
+    await expect(experimentalEntry).toContainText("off");
+    await experimentalEntry.getByRole("button", { name: "edit" }).click();
+
+    const modal = page.getByTestId("experimental-modal");
+    await expectModalVisible(modal);
+
+    const experimentalInput = modal.getByLabel("Enable experimental features.");
+    await expect(experimentalInput).not.toBeChecked();
+    await experimentalInput.click();
+    await modal.getByRole("button", { name: "Close" }).click();
+    await expectModalHidden(modal);
+    await expect(experimentalEntry).toContainText("on");
+
+    await restart(CONFIG_GRID_ONLY);
+    await page.reload();
+
+    await expect(experimentalEntry).toContainText("on");
+    await experimentalEntry.getByRole("button", { name: "edit" }).click();
+    await expectModalVisible(modal);
+    await expect(experimentalInput).toBeChecked();
+  });
 });
 
 test.describe("network modal", async () => {