diff --git a/.github/workflows/default.yml b/.github/workflows/default.yml
index 95dcaa5a8..de7f2441e 100644
--- a/.github/workflows/default.yml
+++ b/.github/workflows/default.yml
@@ -177,11 +177,6 @@ jobs:
   integration:
     name: Integration
     runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        shardIndex: [1, 2]
-        shardTotal: [2]
 
     steps:
       - uses: actions/checkout@v4
@@ -224,7 +219,7 @@ jobs:
         run: npx playwright install --with-deps chromium
 
       - name: Run tests
-        run: npx playwright test --shard=${{ matrix.shardIndex }}/${{ matrix.shardTotal }}
+        run: npx playwright test
 
       # - name: Run tests
       #   uses: docker://mcr.microsoft.com/playwright:v1.34.3-jammy
@@ -234,6 +229,6 @@ jobs:
       - uses: actions/upload-artifact@v4
         if: ${{ !cancelled() }}
         with:
-          name: playwright-report-${{ matrix.shardIndex }}
+          name: playwright-report
           path: playwright-report/
           retention-days: 14
diff --git a/playwright.config.js b/playwright.config.js
index 17932c99d..c10ac944d 100644
--- a/playwright.config.js
+++ b/playwright.config.js
@@ -4,22 +4,21 @@ import { defineConfig, devices } from "@playwright/test";
  * @see https://playwright.dev/docs/test-configuration
  */
 export default defineConfig({
-	testDir: "./tests",
-	fullyParallel: false,
-	forbidOnly: !!process.env.CI,
-	retries: process.env.CI ? 2 : 0,
-	timeout: 15000, // 15s (default 30s)
-	expect: { timeout: 2500 }, // 2.5s (default 5s)
-	workers: 1, // run testfiles serially to avoid port and database conflicts
-	reporter: "html",
-	use: {
-		baseURL: "http://127.0.0.1:7070",
-		trace: "on-first-retry",
-	},
-	projects: [
-		{
-			name: "chromium",
-			use: { ...devices["Desktop Chrome"] },
-		},
-	],
+  testDir: "./tests",
+  forbidOnly: !!process.env.CI,
+  retries: process.env.CI ? 2 : 0,
+  timeout: 15000, // 15s (default 30s)
+  expect: { timeout: 2500 }, // 2.5s (default 5s)
+  workers: process.env.CI ? 3 : 8,
+  reporter: "html",
+  use: {
+    baseURL: "http://127.0.0.1:7070",
+    trace: "on-first-retry",
+  },
+  projects: [
+    {
+      name: "chromium",
+      use: { ...devices["Desktop Chrome"] },
+    },
+  ],
 });
diff --git a/tests/auth.spec.js b/tests/auth.spec.js
index 23620d8fb..e7163cff5 100644
--- a/tests/auth.spec.js
+++ b/tests/auth.spec.js
@@ -1,5 +1,7 @@
 import { test, expect } from "@playwright/test";
-import { start, stop } from "./evcc";
+import { start, stop, baseUrl } from "./evcc";
+
+test.use({ baseURL: baseUrl() });
 
 test.beforeEach(async ({ page }) => {
   await start("basics.evcc.yaml");
diff --git a/tests/basics.spec.js b/tests/basics.spec.js
index 490d7c795..4a8504143 100644
--- a/tests/basics.spec.js
+++ b/tests/basics.spec.js
@@ -1,5 +1,7 @@
 import { test, expect } from "@playwright/test";
-import { start, stop } from "./evcc";
+import { start, stop, baseUrl } from "./evcc";
+
+test.use({ baseURL: baseUrl() });
 
 test.beforeAll(async () => {
   await start("basics.evcc.yaml", "password.sql");
diff --git a/tests/config-meters.spec.js b/tests/config-meters.spec.js
new file mode 100644
index 000000000..fa3823429
--- /dev/null
+++ b/tests/config-meters.spec.js
@@ -0,0 +1,85 @@
+import { test, expect } from "@playwright/test";
+import { start, stop, restart, baseUrl } from "./evcc";
+import { startSimulator, stopSimulator, simulatorUrl, simulatorHost } from "./simulator";
+
+const CONFIG_EMPTY = "config-empty.evcc.yaml";
+
+test.use({ baseURL: baseUrl() });
+
+test.beforeAll(async () => {
+  await start(CONFIG_EMPTY, "password.sql");
+  await startSimulator();
+});
+test.afterAll(async () => {
+  await stop();
+  await stopSimulator();
+});
+
+async function login(page) {
+  await page.locator("#loginPassword").fill("secret");
+  await page.getByRole("button", { name: "Login" }).click();
+}
+
+async function enableExperimental(page) {
+  await page
+    .getByTestId("generalconfig-experimental")
+    .getByRole("link", { name: "change" })
+    .click();
+  await page.getByLabel("Experimental 🧪").click();
+  await page.getByRole("button", { name: "Close" }).click();
+}
+
+test.describe("meters", async () => {
+  test("create, edit and remove battery meter", async ({ page }) => {
+    // setup test data for mock openems api
+    await page.goto(simulatorUrl());
+    await page.getByLabel("Battery Power").fill("-2500");
+    await page.getByLabel("Battery SoC").fill("75");
+    await page.getByRole("button", { name: "Apply changes" }).click();
+
+    await page.goto("/#/config");
+    await login(page);
+    await enableExperimental(page);
+
+    await expect(page.getByTestId("battery")).toHaveCount(0);
+
+    // create #1
+    await page.getByRole("button", { name: "Add solar or battery" }).click();
+
+    const meterModal = page.getByTestId("meter-modal");
+    await meterModal.getByRole("button", { name: "Add battery meter" }).click();
+    await meterModal.getByLabel("Manufacturer").selectOption("OpenEMS");
+    await meterModal.getByLabel("IP address or hostname").fill(simulatorHost());
+    await expect(meterModal.getByRole("button", { name: "Validate & save" })).toBeVisible();
+    await meterModal.getByRole("link", { name: "validate" }).click();
+    await expect(meterModal.getByText("SoC: 75.0%")).toBeVisible();
+    await expect(meterModal.getByText("Power: -2.5 kW")).toBeVisible();
+    await meterModal.getByRole("button", { name: "Save" }).click();
+    await expect(page.getByTestId("battery")).toBeVisible(1);
+    await expect(page.getByTestId("battery")).toContainText("openems");
+
+    // edit #1
+    await page.getByTestId("battery").getByRole("button", { name: "edit" }).click();
+    await meterModal.getByLabel("Battery capacity in kWh").fill("20");
+    await meterModal.getByRole("button", { name: "Validate & save" }).click();
+
+    await expect(page.getByTestId("battery")).toBeVisible(1);
+    await expect(page.getByTestId("battery")).toContainText("openems");
+    await expect(page.getByTestId("battery").getByText("SoC: 75.0%")).toBeVisible();
+    await expect(page.getByTestId("battery").getByText("Power: -2.5 kW")).toBeVisible();
+    await expect(page.getByTestId("battery").getByText("Capacity: 20.0 kWh")).toBeVisible();
+
+    // restart and check in main ui
+    await restart(CONFIG_EMPTY);
+    await page.goto("/");
+    await page.getByTestId("visualization").click();
+    await expect(page.getByTestId("energyflow")).toContainText("Battery charging75%2.5 kW");
+
+    // delete #1
+    await page.goto("/#/config");
+    await page.getByTestId("battery").getByRole("button", { name: "edit" }).click();
+    await meterModal.getByRole("button", { name: "Delete" }).click();
+
+    await expect(page.getByTestId("battery")).toHaveCount(0);
+  });
+});
diff --git a/tests/config-vehicles.spec.js b/tests/config-vehicles.spec.js
new file mode 100644
index 000000000..5e7e4c5e4
--- /dev/null
+++ b/tests/config-vehicles.spec.js
@@ -0,0 +1,132 @@
+import { test, expect } from "@playwright/test";
+import { start, stop, restart, cleanRestart, baseUrl } from "./evcc";
+
+const CONFIG_EMPTY = "config-empty.evcc.yaml";
+const CONFIG_WITH_VEHICLE = "config-with-vehicle.evcc.yaml";
+
+test.use({ baseURL: baseUrl() });
+
+test.beforeAll(async () => {
+  await start(CONFIG_EMPTY, "password.sql");
+});
+test.afterAll(async () => {
+  await stop();
+});
+
+async function login(page) {
+  await page.locator("#loginPassword").fill("secret");
+  await page.getByRole("button", { name: "Login" }).click();
+}
+
+async function enableExperimental(page) {
+  await page
+    .getByTestId("generalconfig-experimental")
+    .getByRole("link", { name: "change" })
+    .click();
+  await page.getByLabel("Experimental 🧪").click();
+  await page.getByRole("button", { name: "Close" }).click();
+}
+
+test.describe("vehicles", async () => {
+  test("create, edit and delete vehicles", async ({ page }) => {
+    await page.goto("/#/config");
+    await login(page);
+    await enableExperimental(page);
+
+    await expect(page.getByTestId("vehicle")).toHaveCount(0);
+    const vehicleModal = page.getByTestId("vehicle-modal");
+
+    // create #1
+    await page.getByTestId("add-vehicle").click();
+    await vehicleModal.getByLabel("Manufacturer").selectOption("Generic vehicle");
+    await vehicleModal.getByLabel("Title").fill("Green Car");
+    await vehicleModal.getByRole("button", { name: "Validate & save" }).click();
+
+    await expect(page.getByTestId("vehicle")).toHaveCount(1);
+
+    // create #2
+    await page.getByTestId("add-vehicle").click();
+    await vehicleModal.getByLabel("Manufacturer").selectOption("Generic vehicle");
+    await vehicleModal.getByLabel("Title").fill("Yellow Van");
+    await vehicleModal.getByRole("button", { name: "Validate & save" }).click();
+
+    await expect(page.getByTestId("vehicle")).toHaveCount(2);
+    await expect(page.getByTestId("vehicle").nth(0)).toHaveText(/Green Car/);
+    await expect(page.getByTestId("vehicle").nth(1)).toHaveText(/Yellow Van/);
+
+    // edit #1
+    await page.getByTestId("vehicle").nth(0).getByRole("button", { name: "edit" }).click();
+    await expect(vehicleModal.getByLabel("Title")).toHaveValue("Green Car");
+    await vehicleModal.getByLabel("Title").fill("Fancy Car");
+    await vehicleModal.getByRole("button", { name: "Validate & save" }).click();
+
+    await expect(page.getByTestId("vehicle")).toHaveCount(2);
+    await expect(page.getByTestId("vehicle").nth(0)).toHaveText(/Fancy Car/);
+
+    // delete #1
+    await page.getByTestId("vehicle").nth(0).getByRole("button", { name: "edit" }).click();
+    await vehicleModal.getByRole("button", { name: "Delete" }).click();
+
+    await expect(page.getByTestId("vehicle")).toHaveCount(1);
+    await expect(page.getByTestId("vehicle").nth(0)).toHaveText(/Yellow Van/);
+
+    // delete #2
+    await page.getByTestId("vehicle").nth(0).getByRole("button", { name: "edit" }).click();
+    await vehicleModal.getByRole("button", { name: "Delete" }).click();
+
+    await expect(page.getByTestId("vehicle")).toHaveCount(0);
+  });
+
+  test("config should survive restart", async ({ page }) => {
+    await page.goto("/#/config");
+    await login(page);
+    await enableExperimental(page);
+
+    await expect(page.getByTestId("vehicle")).toHaveCount(0);
+    const vehicleModal = page.getByTestId("vehicle-modal");
+
+    // create #1 & #2
+    await page.getByTestId("add-vehicle").click();
+    await vehicleModal.getByLabel("Manufacturer").selectOption("Generic vehicle");
+    await vehicleModal.getByLabel("Title").fill("Green Car");
+    await vehicleModal.getByRole("button", { name: "Validate & save" }).click();
+
+    await page.getByTestId("add-vehicle").click();
+    await vehicleModal.getByLabel("Manufacturer").selectOption("Generic vehicle");
+    await vehicleModal.getByLabel("Title").fill("Yellow Van");
+    await vehicleModal.getByLabel("car").click();
+    await vehicleModal.getByLabel("van").check();
+    await vehicleModal.getByRole("button", { name: "Validate & save" }).click();
+
+    await expect(page.getByTestId("vehicle")).toHaveCount(2);
+
+    // restart evcc
+    await restart(CONFIG_EMPTY);
+    await page.reload();
+
+    await expect(page.getByTestId("vehicle")).toHaveCount(2);
+    await expect(page.getByTestId("vehicle").nth(0)).toHaveText(/Green Car/);
+    await expect(page.getByTestId("vehicle").nth(1)).toHaveText(/Yellow Van/);
+  });
+
+  test("mixed config (yaml + db)", async ({ page }) => {
+    await cleanRestart(CONFIG_WITH_VEHICLE, "password.sql");
+
+    await page.goto("/#/config");
+    await login(page);
+    await enableExperimental(page);
+
+    await expect(page.getByTestId("vehicle")).toHaveCount(1);
+    const vehicleModal = page.getByTestId("vehicle-modal");
+
+    // create #1
+    await page.getByTestId("add-vehicle").click();
+    await vehicleModal.getByLabel("Manufacturer").selectOption("Generic vehicle");
+    await vehicleModal.getByLabel("Title").fill("Green Car");
+    await vehicleModal.getByRole("button", { name: "Validate & save" }).click();
+
+    await expect(page.getByTestId("vehicle")).toHaveCount(2);
+    await expect(page.getByTestId("vehicle").nth(0)).toHaveText(/YAML Bike/);
+    await expect(page.getByTestId("vehicle").nth(1)).toHaveText(/Green Car/);
+  });
+});
diff --git a/tests/config.spec.js b/tests/config.spec.js
index 6edeccb0f..15a9da81a 100644
--- a/tests/config.spec.js
+++ b/tests/config.spec.js
@@ -1,9 +1,9 @@
 import { test, expect } from "@playwright/test";
-import { start, stop, restart, cleanRestart } from "./evcc";
-import { startSimulator, stopSimulator, SIMULATOR_URL, SIMULATOR_HOST } from "./simulator";
+import { start, stop, baseUrl } from "./evcc";
 
 const CONFIG_EMPTY = "config-empty.evcc.yaml";
-const CONFIG_WITH_VEHICLE = "config-with-vehicle.evcc.yaml";
+
+test.use({ baseURL: baseUrl() });
 
 test.beforeAll(async () => {
   await start(CONFIG_EMPTY, "password.sql");
@@ -42,172 +42,6 @@ test.describe("basics", async () => {
   });
 });
 
-test.describe("vehicles", async () => {
-  test("create, edit and delete vehicles", async ({ page }) => {
-    await page.goto("/#/config");
-    await login(page);
-    await enableExperimental(page);
-
-    await expect(page.getByTestId("vehicle")).toHaveCount(0);
-    const vehicleModal = page.getByTestId("vehicle-modal");
-
-    // create #1
-    await page.getByTestId("add-vehicle").click();
-    await vehicleModal.getByLabel("Manufacturer").selectOption("Generic vehicle");
-    await vehicleModal.getByLabel("Title").fill("Green Car");
-    await vehicleModal.getByRole("button", { name: "Validate & save" }).click();
-
-    await expect(page.getByTestId("vehicle")).toHaveCount(1);
-
-    // create #2
-    await page.getByTestId("add-vehicle").click();
-    await vehicleModal.getByLabel("Manufacturer").selectOption("Generic vehicle");
-    await vehicleModal.getByLabel("Title").fill("Yellow Van");
-    await vehicleModal.getByRole("button", { name: "Validate & save" }).click();
-
-    await expect(page.getByTestId("vehicle")).toHaveCount(2);
-    await expect(page.getByTestId("vehicle").nth(0)).toHaveText(/Green Car/);
-    await expect(page.getByTestId("vehicle").nth(1)).toHaveText(/Yellow Van/);
-
-    // edit #1
-    await page.getByTestId("vehicle").nth(0).getByRole("button", { name: "edit" }).click();
-    await expect(vehicleModal.getByLabel("Title")).toHaveValue("Green Car");
-    await vehicleModal.getByLabel("Title").fill("Fancy Car");
-    await vehicleModal.getByRole("button", { name: "Validate & save" }).click();
-
-    await expect(page.getByTestId("vehicle")).toHaveCount(2);
-    await expect(page.getByTestId("vehicle").nth(0)).toHaveText(/Fancy Car/);
-
-    // delete #1
-    await page.getByTestId("vehicle").nth(0).getByRole("button", { name: "edit" }).click();
-    await vehicleModal.getByRole("button", { name: "Delete" }).click();
-
-    await expect(page.getByTestId("vehicle")).toHaveCount(1);
-    await expect(page.getByTestId("vehicle").nth(0)).toHaveText(/Yellow Van/);
-
-    // delete #2
-    await page.getByTestId("vehicle").nth(0).getByRole("button", { name: "edit" }).click();
-    await vehicleModal.getByRole("button", { name: "Delete" }).click();
-
-    await expect(page.getByTestId("vehicle")).toHaveCount(0);
-  });
-
-  test("config should survive restart", async ({ page }) => {
-    await page.goto("/#/config");
-    await login(page);
-    await enableExperimental(page);
-
-    await expect(page.getByTestId("vehicle")).toHaveCount(0);
-    const vehicleModal = page.getByTestId("vehicle-modal");
-
-    // create #1 & #2
-    await page.getByTestId("add-vehicle").click();
-    await vehicleModal.getByLabel("Manufacturer").selectOption("Generic vehicle");
-    await vehicleModal.getByLabel("Title").fill("Green Car");
-    await vehicleModal.getByRole("button", { name: "Validate & save" }).click();
-
-    await page.getByTestId("add-vehicle").click();
-    await vehicleModal.getByLabel("Manufacturer").selectOption("Generic vehicle");
-    await vehicleModal.getByLabel("Title").fill("Yellow Van");
-    await vehicleModal.getByLabel("car").click();
-    await vehicleModal.getByLabel("van").check();
-    await vehicleModal.getByRole("button", { name: "Validate & save" }).click();
-
-    await expect(page.getByTestId("vehicle")).toHaveCount(2);
-
-    // restart evcc
-    await restart(CONFIG_EMPTY);
-    await page.reload();
-
-    await expect(page.getByTestId("vehicle")).toHaveCount(2);
-    await expect(page.getByTestId("vehicle").nth(0)).toHaveText(/Green Car/);
-    await expect(page.getByTestId("vehicle").nth(1)).toHaveText(/Yellow Van/);
-  });
-
-  test("mixed config (yaml + db)", async ({ page }) => {
-    await cleanRestart(CONFIG_WITH_VEHICLE, "password.sql");
-
-    await page.goto("/#/config");
-    await login(page);
-    await enableExperimental(page);
-
-    await expect(page.getByTestId("vehicle")).toHaveCount(1);
-    const vehicleModal = page.getByTestId("vehicle-modal");
-
-    // create #1
-    await page.getByTestId("add-vehicle").click();
-    await vehicleModal.getByLabel("Manufacturer").selectOption("Generic vehicle");
-    await vehicleModal.getByLabel("Title").fill("Green Car");
-    await vehicleModal.getByRole("button", { name: "Validate & save" }).click();
-
-    await expect(page.getByTestId("vehicle")).toHaveCount(2);
-    await expect(page.getByTestId("vehicle").nth(0)).toHaveText(/YAML Bike/);
-    await expect(page.getByTestId("vehicle").nth(1)).toHaveText(/Green Car/);
-  });
-});
-
-test.describe("meters", async () => {
-  test.beforeAll(async () => {
-    await startSimulator();
-  });
-  test.afterAll(async () => {
-    await stopSimulator();
-  });
-
-  test("create, edit and remove battery meter", async ({ page }) => {
-    // setup test data for mock openems api
-    await page.goto(SIMULATOR_URL);
-    await page.getByLabel("Battery Power").fill("-2500");
-    await page.getByLabel("Battery SoC").fill("75");
-    await page.getByRole("button", { name: "Apply changes" }).click();
-
-    await page.goto("/#/config");
-    await login(page);
-    await enableExperimental(page);
-
-    await expect(page.getByTestId("battery")).toHaveCount(0);
-
-    // create #1
-    await page.getByRole("button", { name: "Add solar or battery" }).click();
-
-    const meterModal = page.getByTestId("meter-modal");
-    await meterModal.getByRole("button", { name: "Add battery meter" }).click();
-    await meterModal.getByLabel("Manufacturer").selectOption("OpenEMS");
-    await meterModal.getByLabel("IP address or hostname").fill(SIMULATOR_HOST);
-    await expect(meterModal.getByRole("button", { name: "Validate & save" })).toBeVisible();
-    await meterModal.getByRole("link", { name: "validate" }).click();
-    await expect(meterModal.getByText("SoC: 75.0%")).toBeVisible();
-    await expect(meterModal.getByText("Power: -2.5 kW")).toBeVisible();
-    await meterModal.getByRole("button", { name: "Save" }).click();
-    await expect(page.getByTestId("battery")).toBeVisible(1);
-    await expect(page.getByTestId("battery")).toContainText("openems");
-
-    // edit #1
-    await page.getByTestId("battery").getByRole("button", { name: "edit" }).click();
-    await meterModal.getByLabel("Battery capacity in kWh").fill("20");
-    await meterModal.getByRole("button", { name: "Validate & save" }).click();
-
-    await expect(page.getByTestId("battery")).toBeVisible(1);
-    await expect(page.getByTestId("battery")).toContainText("openems");
-    await expect(page.getByTestId("battery").getByText("SoC: 75.0%")).toBeVisible();
-    await expect(page.getByTestId("battery").getByText("Power: -2.5 kW")).toBeVisible();
-    await expect(page.getByTestId("battery").getByText("Capacity: 20.0 kWh")).toBeVisible();
-
-    // restart and check in main ui
-    await restart(CONFIG_EMPTY);
-    await page.goto("/");
-    await page.getByTestId("visualization").click();
-    await expect(page.getByTestId("energyflow")).toContainText("Battery charging75%2.5 kW");
-
-    // delete #1
-    await page.goto("/#/config");
-    await page.getByTestId("battery").getByRole("button", { name: "edit" }).click();
-    await meterModal.getByRole("button", { name: "Delete" }).click();
-
-    await expect(page.getByTestId("battery")).toHaveCount(0);
-  });
-});
-
 test.describe("general", async () => {
   test("change site title", async ({ page }) => {
     // initial value on main ui
diff --git a/tests/evcc.js b/tests/evcc.js
index 906c30068..b8ef6dd40 100644
--- a/tests/evcc.js
+++ b/tests/evcc.js
@@ -2,13 +2,25 @@ import fs from "fs";
 import waitOn from "wait-on";
 import axios from "axios";
 import { exec, execSync } from "child_process";
-import playwrightConfig from "../playwright.config.js";
+import os from "os";
+import path from "path";
 
-const BASE_URL = playwrightConfig.use.baseURL;
-
-const DB_PATH = "./evcc.db";
 const BINARY = "./evcc";
 
+function port() {
+  const index = process.env.TEST_WORKER_INDEX * 1;
+  return 11000 + index;
+}
+
+export function baseUrl() {
+  return `http://localhost:${port()}`;
+}
+
+function dbPath() {
+  const file = `evcc-${port()}.db`;
+  return path.join(os.tmpdir(), file);
+}
+
 export async function start(config, sqlDumps) {
   await _clean();
   if (sqlDumps) {
@@ -39,14 +51,17 @@ export async function cleanRestart(config, sqlDumps) {
 async function _restoreDatabase(sqlDumps) {
   const dumps = Array.isArray(sqlDumps) ? sqlDumps : [sqlDumps];
   for (const dump of dumps) {
-    console.log("loading database", dump);
-    execSync(`sqlite3 ${DB_PATH} < tests/${dump}`);
+    console.log("loading database", dbPath(), dump);
+    execSync(`sqlite3 ${dbPath()} < tests/${dump}`);
   }
 }
 
 async function _start(config) {
+  const configFile = config.includes("/") ? config : `tests/${config}`;
   console.log("starting evcc", { config });
-  const instance = exec(`EVCC_DATABASE_DSN=${DB_PATH} ${BINARY} --config tests/${config}`);
+  const instance = exec(
+    `EVCC_NETWORK_PORT=${port()} EVCC_DATABASE_DSN=${dbPath()} ${BINARY} --config ${configFile}`
+  );
   instance.stdout.pipe(process.stdout);
   instance.stderr.pipe(process.stderr);
   instance.on("exit", (code) => {
@@ -54,20 +69,21 @@ async function _start(config) {
       throw new Error("evcc terminated", code);
     }
   });
-  await waitOn({ resources: [BASE_URL] });
+  await waitOn({ resources: [baseUrl()] });
 }
 
 async function _stop() {
   console.log("shutting down evcc");
-  const res = await axios.post(BASE_URL + "/api/auth/login", { password: "secret" });
+  const res = await axios.post(`${baseUrl()}/api/auth/login`, { password: "secret" });
   console.log(res.status, res.statusText);
   const cookie = res.headers["set-cookie"];
-  await axios.post(BASE_URL + "/api/system/shutdown", {}, { headers: { cookie } });
+  await axios.post(`${baseUrl()}/api/system/shutdown`, {}, { headers: { cookie } });
 }
 
 async function _clean() {
-  if (fs.existsSync(DB_PATH)) {
-    console.log("delete database", DB_PATH);
-    fs.unlinkSync(DB_PATH);
+  const db = dbPath();
+  if (fs.existsSync(db)) {
+    console.log("delete database", db);
+    fs.unlinkSync(db);
   }
 }
diff --git a/tests/heating.spec.js b/tests/heating.spec.js
index 4cafc8322..d11df1968 100644
--- a/tests/heating.spec.js
+++ b/tests/heating.spec.js
@@ -1,5 +1,7 @@
 import { test, expect } from "@playwright/test";
-import { start, stop } from "./evcc";
+import { start, stop, baseUrl } from "./evcc";
+
+test.use({ baseURL: baseUrl() });
 
 test.beforeAll(async () => {
   await start("heating.evcc.yaml", "password.sql");
diff --git a/tests/limits.spec.js b/tests/limits.spec.js
index e7244f712..520cfcb3d 100644
--- a/tests/limits.spec.js
+++ b/tests/limits.spec.js
@@ -1,8 +1,8 @@
 import { test, expect } from "@playwright/test";
-import { start, stop } from "./evcc";
-import { startSimulator, stopSimulator, SIMULATOR_URL } from "./simulator";
+import { start, stop, baseUrl } from "./evcc";
+import { startSimulator, stopSimulator, simulatorUrl, simulatorConfig } from "./simulator";
 
-const CONFIG = "simulator.evcc.yaml";
+test.use({ baseURL: baseUrl() });
 
 test.beforeAll(async () => {
   await startSimulator();
@@ -12,9 +12,9 @@ test.afterAll(async () => {
 });
 
 test.beforeEach(async ({ page }) => {
-  await start(CONFIG, "password.sql");
+  await start(simulatorConfig(), "password.sql");
 
-  await page.goto(SIMULATOR_URL);
+  await page.goto(simulatorUrl());
   await page.getByLabel("Grid Power").fill("500");
   await page.getByTestId("vehicle0").getByLabel("SoC").fill("20");
   await page.getByTestId("loadpoint0").getByText("B (connected)").click();
@@ -39,7 +39,7 @@ test.describe("limitSoc", async () => {
   });
 
   test("can be set even if vehicle isn't connected yet", async ({ page }) => {
-    await page.goto(SIMULATOR_URL);
+    await page.goto(simulatorUrl());
     await page.getByTestId("loadpoint0").getByText("A (disconnected)").click();
     await page.getByRole("button", { name: "Apply changes" }).click();
 
@@ -50,7 +50,7 @@ test.describe("limitSoc", async () => {
     await page.getByTestId("limit-soc").getByRole("combobox").selectOption("50%");
     await expect(page.getByTestId("limit-soc-value")).toHaveText("50%");
 
-    await page.goto(SIMULATOR_URL);
+    await page.goto(simulatorUrl());
     await page.getByTestId("loadpoint0").getByText("B (connected)").click();
     await page.getByRole("button", { name: "Apply changes" }).click();
 
@@ -65,7 +65,7 @@ test.describe("limitSoc", async () => {
     await expect(page.getByTestId("limit-soc-value")).toHaveText("50%");
 
     // disconnect
-    await page.goto(SIMULATOR_URL);
+    await page.goto(simulatorUrl());
     await page.getByTestId("loadpoint0").getByText("A (disconnected)").click();
     await page.getByRole("button", { name: "Apply changes" }).click();
 
@@ -74,7 +74,7 @@ test.describe("limitSoc", async () => {
     await expect(page.getByTestId("limit-soc-value")).toHaveText("100%");
 
     // connect
-    await page.goto(SIMULATOR_URL);
+    await page.goto(simulatorUrl());
     await page.getByTestId("loadpoint0").getByText("B (connected)").click();
     await page.getByRole("button", { name: "Apply changes" }).click();
 
diff --git a/tests/logs.spec.js b/tests/logs.spec.js
index 91bd0d902..867ec493d 100644
--- a/tests/logs.spec.js
+++ b/tests/logs.spec.js
@@ -1,5 +1,7 @@
 import { test, expect } from "@playwright/test";
-import { start, stop } from "./evcc";
+import { start, stop, baseUrl } from "./evcc";
+
+test.use({ baseURL: baseUrl() });
 
 test.beforeAll(async () => {
   await start("basics.evcc.yaml", "password.sql");
diff --git a/tests/modals.spec.js b/tests/modals.spec.js
index 62f229327..7d6fe553a 100644
--- a/tests/modals.spec.js
+++ b/tests/modals.spec.js
@@ -1,12 +1,13 @@
 import { test, expect } from "@playwright/test";
-import { start, stop } from "./evcc";
-import { startSimulator, stopSimulator } from "./simulator";
+import { start, stop, baseUrl } from "./evcc";
+import { startSimulator, stopSimulator, simulatorConfig } from "./simulator";
 
 const BASICS_CONFIG = "basics.evcc.yaml";
-const SIMULATOR_CONFIG = "simulator.evcc.yaml";
 
 const UI_ROUTES = ["/", "/#/sessions", "/#/config"];
 
+test.use({ baseURL: baseUrl() });
+
 async function login(page) {
   await page.locator("#loginPassword").fill("secret");
   await page.getByRole("button", { name: "Login" }).click();
@@ -55,7 +56,7 @@ test.describe("Basics", async () => {
 
 test.describe("Advanced", async () => {
   test.beforeAll(async () => {
-    await start(SIMULATOR_CONFIG, "password.sql");
+    await start(simulatorConfig(), "password.sql");
     await startSimulator();
   });
 
diff --git a/tests/plan.spec.js b/tests/plan.spec.js
index db0e0ce71..2836339bf 100644
--- a/tests/plan.spec.js
+++ b/tests/plan.spec.js
@@ -1,5 +1,7 @@
 import { test, expect } from "@playwright/test";
-import { start, stop } from "./evcc";
+import { start, stop, baseUrl } from "./evcc";
+
+test.use({ baseURL: baseUrl() });
 
 const CONFIG = "plan.evcc.yaml";
 
diff --git a/tests/sessions.spec.js b/tests/sessions.spec.js
index 20f98bb2e..e46c6d6bb 100644
--- a/tests/sessions.spec.js
+++ b/tests/sessions.spec.js
@@ -1,5 +1,7 @@
 import { test, expect, devices } from "@playwright/test";
-import { start, stop } from "./evcc";
+import { start, stop, baseUrl } from "./evcc";
+
+test.use({ baseURL: baseUrl() });
 
 const mobile = devices["iPhone 12 Mini"].viewport;
 const desktop = devices["Desktop Chrome"].viewport;
diff --git a/tests/simulator.js b/tests/simulator.js
index 27d91e2c2..8e8ad7b8e 100644
--- a/tests/simulator.js
+++ b/tests/simulator.js
@@ -1,15 +1,36 @@
+import os from "os";
+import path from "path";
+import fs from "fs";
 import waitOn from "wait-on";
 import axios from "axios";
 import { exec } from "child_process";
 
-export const SIMULATOR_HOST = "localhost:7072";
-export const SIMULATOR_URL = `http://${SIMULATOR_HOST}/`;
-const HEALTH_URL = SIMULATOR_URL + "api/state";
-const SHUTDOWN_URL = SIMULATOR_URL + "api/shutdown";
+function port() {
+  const index = process.env.TEST_PARALLEL_INDEX * 1;
+  return 12000 + index;
+}
+
+export function simulatorHost() {
+  return `localhost:${port()}`;
+}
+
+export function simulatorUrl() {
+  return `http://${simulatorHost()}`;
+}
+
+export function simulatorConfig() {
+  const input = "./tests/simulator.evcc.yaml";
+  const content = fs.readFileSync(input, "utf8");
+  const result = content.replace(/localhost:7072/g, simulatorHost());
+  const resultName = "simulator.evcc.generated.yaml";
+  const resultPath = path.join(os.tmpdir(), resultName);
+  fs.writeFileSync(resultPath, result);
+  return resultPath;
+}
 
 export async function startSimulator() {
   console.log("starting simulator");
-  const instance = exec("npm run simulator");
+  const instance = exec(`npm run simulator -- --port ${port()}`);
   console.log("exec end");
   instance.stdout.pipe(process.stdout);
   instance.stderr.pipe(process.stderr);
@@ -20,10 +41,10 @@ export async function startSimulator() {
     }
   });
   console.log("waiton");
-  await waitOn({ resources: [HEALTH_URL], log: true });
+  await waitOn({ resources: [`${simulatorUrl()}/api/state`], log: true });
 }
 
 export async function stopSimulator() {
   console.log("shutting down simulator");
-  await axios.post(SHUTDOWN_URL);
+  await axios.post(`${simulatorUrl()}/api/shutdown`);
 }
diff --git a/tests/smart-cost.spec.js b/tests/smart-cost.spec.js
index dc2dd845b..8e62838da 100644
--- a/tests/smart-cost.spec.js
+++ b/tests/smart-cost.spec.js
@@ -1,11 +1,11 @@
 import { test, expect } from "@playwright/test";
-import { start, stop } from "./evcc";
-import { startSimulator, stopSimulator, SIMULATOR_URL } from "./simulator";
+import { start, stop, baseUrl } from "./evcc";
+import { startSimulator, stopSimulator, simulatorUrl, simulatorConfig } from "./simulator";
 
-const CONFIG = "simulator.evcc.yaml";
+test.use({ baseURL: baseUrl() });
 
 test.beforeAll(async () => {
-  await start(CONFIG, "password.sql");
+  await start(simulatorConfig(), "password.sql");
   await startSimulator();
 });
 test.afterAll(async () => {
@@ -14,7 +14,7 @@ test.afterAll(async () => {
 });
 
 test.beforeEach(async ({ page }) => {
-  await page.goto(SIMULATOR_URL);
+  await page.goto(simulatorUrl());
   await page.getByLabel("PV Power").fill("6000");
   await page.getByTestId("loadpoint0").getByLabel("Power").fill("6000");
   await page.getByTestId("loadpoint0").getByText("C (charging)").click();
diff --git a/tests/statistics.spec.js b/tests/statistics.spec.js
index 249517505..33d63a6d9 100644
--- a/tests/statistics.spec.js
+++ b/tests/statistics.spec.js
@@ -1,5 +1,7 @@
 import { test, expect } from "@playwright/test";
-import { start, stop } from "./evcc";
+import { start, stop, baseUrl } from "./evcc";
+
+test.use({ baseURL: baseUrl() });
 
 test.beforeAll(async () => {
   await start("statistics.evcc.yaml", ["password.sql", "statistics.sql"]);
diff --git a/tests/vehicle-error.spec.js b/tests/vehicle-error.spec.js
index 381655f71..9a58a80a9 100644
--- a/tests/vehicle-error.spec.js
+++ b/tests/vehicle-error.spec.js
@@ -1,5 +1,7 @@
 import { test, expect } from "@playwright/test";
-import { start, stop } from "./evcc";
+import { start, stop, baseUrl } from "./evcc";
+
+test.use({ baseURL: baseUrl() });
 
 test.beforeAll(async () => {
   await start("vehicle-error.evcc.yaml", "password.sql");
diff --git a/tests/vehicle-settings.spec.js b/tests/vehicle-settings.spec.js
index a02f8375c..52adfb7f9 100644
--- a/tests/vehicle-settings.spec.js
+++ b/tests/vehicle-settings.spec.js
@@ -1,8 +1,8 @@
 import { test, expect } from "@playwright/test";
-import { start, stop, restart } from "./evcc";
-import { startSimulator, stopSimulator, SIMULATOR_URL } from "./simulator";
+import { start, stop, restart, baseUrl } from "./evcc";
+import { startSimulator, stopSimulator, simulatorUrl, simulatorConfig } from "./simulator";
 
-const CONFIG = "simulator.evcc.yaml";
+test.use({ baseURL: baseUrl() });
 
 test.beforeAll(async () => {
   await startSimulator();
@@ -12,9 +12,9 @@ test.afterAll(async () => {
 });
 
 test.beforeEach(async ({ page }) => {
-  await start(CONFIG, "password.sql");
+  await start(simulatorConfig(), "password.sql");
 
-  await page.goto(SIMULATOR_URL);
+  await page.goto(simulatorUrl());
   await page.getByLabel("Grid Power").fill("500");
   await page.getByTestId("vehicle0").getByLabel("SoC").fill("20");
   await page.getByTestId("loadpoint0").getByText("B (connected)").click();
@@ -36,7 +36,7 @@ test.describe("minSoc", async () => {
     await page.getByRole("combobox", { name: "Min. charge %" }).selectOption("20%");
     await expect(page.getByText("charged to 20% in solar mode")).toBeVisible();
 
-    await restart(CONFIG);
+    await restart(simulatorConfig());
     await page.reload();
 
     await page.getByTestId("charging-plan").getByRole("button", { name: "none" }).click();
@@ -75,7 +75,7 @@ test.describe("limitSoc", async () => {
     await page.getByRole("button", { name: "Close" }).click();
     await expect(page.getByTestId("limit-soc-value")).toContainText("80%");
 
-    await restart(CONFIG);
+    await restart(simulatorConfig());
     await page.reload();
 
     await expect(page.getByTestId("limit-soc-value")).toContainText("80%");