diff --git a/PV_Forecast/form.json b/PV_Forecast/form.json
index 91e2ac9..15a8fd3 100644
--- a/PV_Forecast/form.json
+++ b/PV_Forecast/form.json
@@ -8,14 +8,19 @@
     {
       "type": "SelectVariable",
       "name": "ActualVariableID",
-      "caption": "Ist-Produktion Variable"
+      "caption": "Ist-Produktion Variable (Leistung, ideal W oder kW)"
     },
     {
       "type": "NumberSpinner",
       "name": "RefreshMinutes",
       "caption": "Refresh (Minuten)",
       "minimum": 1,
-      "maximum": 120
+      "maximum": 240
+    },
+    {
+      "type": "CheckBox",
+      "name": "ActualIsWatt",
+      "caption": "Istwerte sind in Watt (in kW umrechnen)"
     }
   ],
   "actions": [
@@ -30,3 +35,4 @@
     }
   ]
 }
+
diff --git a/PV_Forecast/module.html b/PV_Forecast/module.html
index 47bbe5c..aa4dc21 100644
--- a/PV_Forecast/module.html
+++ b/PV_Forecast/module.html
@@ -4,7 +4,8 @@
   <meta charset="utf-8">
   <title>PV_Forecast</title>
 
-  <!-- Externes Script: kann je nach CSP/Mixed-Content blockiert sein -->
+  <!-- Hinweis: Wenn Symcon/CDN blockiert, kommt "Highcharts nicht geladen".
+       Dann sag Bescheid, dann liefern wir Highcharts lokal aus. -->
   <script src="https://code.highcharts.com/highcharts.js"></script>
 
   <style>
@@ -26,21 +27,19 @@
   <script>
     const metaEl = document.getElementById("meta");
 
-    // JS-Fehler sichtbar machen (sonst: schwarze Seite, keine Ahnung warum)
     window.onerror = function (msg, url, line, col) {
       metaEl.textContent = `JS-Fehler: ${msg} (${line}:${col})`;
     };
 
-    // Symcon ersetzt {{INSTANCE_ID}} mit einer ZAHL (z.B. 12345)
-    const instanceId = Number("{{INSTANCE_ID}}");
-
+    // VSCode-freundlich (Platzhalter als String)
+    window.instanceId = Number("{{INSTANCE_ID}}");
+    const instanceId = window.instanceId;
 
     if (!Number.isFinite(instanceId) || instanceId <= 0) {
       metaEl.textContent = "Fehler: INSTANCE_ID wurde nicht korrekt eingesetzt.";
       throw new Error("Invalid INSTANCE_ID");
     }
 
-    // Absoluter Endpoint (robuster als nur /hook/..., vor allem bei Proxies)
     const endpoint =
       `${location.protocol}//${location.host}` +
       `/hook/solcastcompare?instance=${instanceId}&action=data`;
@@ -52,7 +51,7 @@
       const r = await fetch(endpoint, { cache: "no-store" });
       if (!r.ok) {
         const text = await r.text().catch(() => "");
-        throw new Error(`HTTP ${r.status} ${text ? "- " + text : ""}`.trim());
+        throw new Error(`HTTP ${r.status}${text ? " - " + text : ""}`);
       }
       return await r.json();
     }
@@ -64,19 +63,20 @@
 
       const forecast = data?.series?.forecast ?? [];
       const actual   = data?.series?.actual ?? [];
-
-      metaEl.textContent = `Forecast Cache: ${cachedAt} | Forecast: ${forecast.length} | Ist: ${actual.length}`;
+      const isWatt    = !!data?.meta?.actual_is_watt;
 
       if (typeof Highcharts === "undefined") {
-        metaEl.textContent = "Fehler: Highcharts konnte nicht geladen werden (CSP/Mixed Content/CDN).";
+        metaEl.textContent = "Fehler: Highcharts nicht geladen (CSP/CDN/Mixed Content).";
         return;
       }
 
+      const yLabel = isWatt ? "Leistung (kW) [Ist umgerechnet]" : "Leistung (kW)";
+
       if (!chart) {
         chart = Highcharts.chart("chart", {
           title: { text: "PV: Erwartung vs. Tatsächlich" },
           xAxis: { type: "datetime" },
-          yAxis: { title: { text: "Leistung" } },
+          yAxis: { title: { text: yLabel } },
           tooltip: { shared: true, xDateFormat: "%d.%m.%Y %H:%M" },
           legend: { enabled: true },
           series: [
@@ -85,10 +85,13 @@
           ]
         });
       } else {
+        chart.yAxis[0].setTitle({ text: yLabel }, false);
         chart.series[0].setData(forecast, false);
         chart.series[1].setData(actual, false);
         chart.redraw();
       }
+
+      metaEl.textContent = `OK | Cache: ${cachedAt} | Forecast: ${forecast.length} | Ist: ${actual.length}`;
     }
 
     async function refresh() {
@@ -101,7 +104,6 @@
     }
 
     document.getElementById("reload").addEventListener("click", refresh);
-
     refresh();
   </script>
 </body>
diff --git a/PV_Forecast/module.json b/PV_Forecast/module.json
index dd88242..4057eb7 100644
--- a/PV_Forecast/module.json
+++ b/PV_Forecast/module.json
@@ -7,6 +7,6 @@
   "parentRequirements": [],
   "childRequirements": [],
   "implemented": [],
-  "prefix": "",
+  "prefix": "PVF",
   "url": ""
 }
diff --git a/PV_Forecast/module.php b/PV_Forecast/module.php
index 3293809..0640aa7 100644
--- a/PV_Forecast/module.php
+++ b/PV_Forecast/module.php
@@ -1,6 +1,6 @@
 <?php
 
-class PV_Forecast  extends IPSModule
+class PV_Forecast extends IPSModule
 {
     // GUID vom Archive Control (Standard in IP-Symcon)
     private const ARCHIVE_GUID = "{43192F0B-135B-4CE7-A0A7-1475603F3060}";
@@ -12,11 +12,13 @@ class PV_Forecast  extends IPSModule
         $this->RegisterPropertyString("URL", "");
         $this->RegisterPropertyInteger("ActualVariableID", 0);
         $this->RegisterPropertyInteger("RefreshMinutes", 5);
+        $this->RegisterPropertyBoolean("ActualIsWatt", true);
 
         // Timer
         $this->RegisterTimer("UpdateForecastTimer", 0, 'IPS_RequestAction($_IPS["TARGET"], "UpdateForecast", 0);');
 
         // Hook für Visualisierung (JSON Endpoint)
+        // (Falls das automatische Registrieren bei dir nicht greift: du hast es manuell im WebHook Control bereits erledigt.)
         $this->RegisterHook("/hook/solcastcompare");
     }
 
@@ -24,13 +26,13 @@ class PV_Forecast  extends IPSModule
     {
         parent::ApplyChanges();
 
-        // HTML-SDK / Tile Visualization aktivieren
+        // Tile Visualization aktivieren
         $this->SetVisualizationType(1);
 
         $mins = max(1, (int)$this->ReadPropertyInteger("RefreshMinutes"));
         $this->SetTimerInterval("UpdateForecastTimer", $mins * 60 * 1000);
 
-        // Hook besser hier registrieren
+        // Hook hier nochmal versuchen zu registrieren (ist oft zuverlässiger)
         $this->RegisterHook("/hook/solcastcompare");
     }
 
@@ -79,7 +81,7 @@ class PV_Forecast  extends IPSModule
 
     // -------- Datenaufbereitung fürs Diagramm --------
 
-    private function GetForecastSeries()
+    private function GetForecastSeries(): array
     {
         $raw = $this->GetBuffer("ForecastRaw");
         if ($raw === "") {
@@ -92,7 +94,6 @@ class PV_Forecast  extends IPSModule
         }
 
         // Solcast liefert period_end in UTC (Z)
-        // Wir geben dem Chart epoch-ms in UTC und lassen JS lokal anzeigen (ok).
         $series = [];
         foreach ($data["estimated_actuals"] as $row) {
             if (!isset($row["period_end"], $row["pv_power_rooftop"])) {
@@ -102,18 +103,21 @@ class PV_Forecast  extends IPSModule
             if ($ts === false) {
                 continue;
             }
-            // pv_power_rooftop ist i.d.R. kW (Solcast rooftop_pv_power)
+
+            // pv_power_rooftop i.d.R. kW
             $val = (float)$row["pv_power_rooftop"];
-            $series[] = [ $ts * 1000, $val ];
+            $series[] = [$ts * 1000, $val];
         }
 
-        // Solcast ist oft absteigend sortiert -> aufsteigend fürs Chart
-        usort($series, function($a, $b) { return $a[0] <=> $b[0]; });
+        // oft absteigend -> aufsteigend fürs Chart
+        usort($series, function ($a, $b) {
+            return $a[0] <=> $b[0];
+        });
 
         return $series;
     }
 
-    private function GetActualSeriesFromArchive($startTs, $endTs, $bucketSeconds = 1800)
+    private function GetActualSeriesFromArchive(int $startTs, int $endTs, int $bucketSeconds = 1800): array
     {
         $varId = (int)$this->ReadPropertyInteger("ActualVariableID");
         if ($varId <= 0 || !IPS_VariableExists($varId)) {
@@ -139,13 +143,19 @@ class PV_Forecast  extends IPSModule
         // Bucket: 30 Minuten
         $buckets = []; // key=bucketEndTs => [sum, count]
         foreach ($logged as $row) {
-            if (!isset($row["TimeStamp"], $row["Value"])) continue;
+            if (!isset($row["TimeStamp"], $row["Value"])) {
+                continue;
+            }
 
             $ts = (int)$row["TimeStamp"];
-            $bucketStart = intdiv($ts, $bucketSeconds) * $bucketSeconds;
-            $bucketEnd = $bucketStart + $bucketSeconds; // wir nehmen wie Solcast period_end
 
-            if ($bucketEnd < $startTs || $bucketEnd > $endTs) continue;
+            // 30min Raster
+            $bucketStart = intdiv($ts, $bucketSeconds) * $bucketSeconds;
+            $bucketEnd = $bucketStart + $bucketSeconds; // wie Solcast period_end
+
+            if ($bucketEnd < $startTs || $bucketEnd > $endTs) {
+                continue;
+            }
 
             if (!isset($buckets[$bucketEnd])) {
                 $buckets[$bucketEnd] = [0.0, 0];
@@ -157,22 +167,29 @@ class PV_Forecast  extends IPSModule
         ksort($buckets);
 
         $series = [];
-        foreach ($buckets as $bucketEnd => [$sum, $count]) {
-            if ($count <= 0) continue;
+        $isWatt = (bool)$this->ReadPropertyBoolean("ActualIsWatt");
+
+        foreach ($buckets as $bucketEnd => $sc) {
+            $sum = $sc[0];
+            $count = $sc[1];
+            if ($count <= 0) {
+                continue;
+            }
+
             $avg = $sum / $count;
 
-            // Falls deine Ist-Variable in W ist und Solcast in kW:
-            // -> hier ggf. /1000 machen.
-            // Ich lasse es neutral. Wenn du willst: uncomment:
-            // $avg = $avg / 1000.0;
+            // W -> kW, damit es zu Solcast passt
+            if ($isWatt) {
+                $avg = $avg / 1000.0;
+            }
 
-            $series[] = [ $bucketEnd * 1000, $avg ];
+            $series[] = [$bucketEnd * 1000, $avg];
         }
 
         return $series;
     }
 
-    private function GetArchiveInstanceID()
+    private function GetArchiveInstanceID(): int
     {
         $list = IPS_GetInstanceListByModuleID(self::ARCHIVE_GUID);
         if (is_array($list) && count($list) > 0) {
@@ -181,7 +198,7 @@ class PV_Forecast  extends IPSModule
         return 0;
     }
 
-    // -------- Visualisierung / Hook --------
+    // -------- Tile Visualisierung --------
 
     public function GetVisualizationTile(): string
     {
@@ -191,18 +208,18 @@ class PV_Forecast  extends IPSModule
         }
 
         $html = file_get_contents(__DIR__ . "/module.html");
-
-        // Platzhalter ersetzen
         $html = str_replace("{{INSTANCE_ID}}", (string)$this->InstanceID, $html);
 
         return $html;
     }
 
+    // -------- WebHook Handler --------
+
     protected function ProcessHookData()
     {
         // Erwartet: /hook/solcastcompare?instance=12345&action=data
         $instance = isset($_GET["instance"]) ? (int)$_GET["instance"] : 0;
-        $action   = isset($_GET["action"]) ? (string)$_GET["action"] : "";
+        $action = isset($_GET["action"]) ? (string)$_GET["action"] : "";
 
         if ($instance !== $this->InstanceID) {
             http_response_code(404);
@@ -216,17 +233,17 @@ class PV_Forecast  extends IPSModule
             return;
         }
 
-        // Zeitraum: letzte 24h (passt zu deinem hours=24)
         $end = time();
         $start = $end - 24 * 3600;
 
         $forecast = $this->GetForecastSeries();
-        $actual   = $this->GetActualSeriesFromArchive($start, $end, 1800);
+        $actual = $this->GetActualSeriesFromArchive($start, $end, 1800);
 
         $out = [
             "meta" => [
                 "forecast_cached_at" => (int)$this->GetBuffer("ForecastTS"),
-                "bucket_seconds" => 1800
+                "bucket_seconds" => 1800,
+                "actual_is_watt" => (bool)$this->ReadPropertyBoolean("ActualIsWatt")
             ],
             "series" => [
                 "forecast" => $forecast,
@@ -238,21 +255,25 @@ class PV_Forecast  extends IPSModule
         echo json_encode($out);
     }
 
-    private function RegisterHook($Hook)
+    // -------- optional: Hook automatisch im WebHook Control registrieren --------
+    // Wenn du es bereits manuell eingetragen hast, ist das hier nicht zwingend.
+    private function RegisterHook(string $Hook)
     {
-        $ids = IPS_GetInstanceListByModuleID("{015A6EB8-D6E5-4B93-B496-0D3FAD4D0E6E}"); // WebHook Control GUID
+        // WebHook Control GUID (kann je nach Version variieren; wenn nicht gefunden -> einfach ignorieren)
+        $ids = IPS_GetInstanceListByModuleID("{015A6EB8-D6E5-4B93-B496-0D3FAD4D0E6E}");
         if (count($ids) === 0) {
-            $this->SendDebug("Hook", "WebHook Control nicht gefunden", 0);
             return;
         }
-        $hookID = $ids[0];
 
+        $hookID = (int)$ids[0];
         $hooks = json_decode(IPS_GetProperty($hookID, "Hooks"), true);
-        if (!is_array($hooks)) $hooks = [];
+        if (!is_array($hooks)) {
+            $hooks = [];
+        }
 
         $found = false;
         foreach ($hooks as $h) {
-            if ($h["Hook"] === $Hook) {
+            if (isset($h["Hook"]) && $h["Hook"] === $Hook) {
                 $found = true;
                 break;
             }
@@ -264,4 +285,4 @@ class PV_Forecast  extends IPSModule
             IPS_ApplyChanges($hookID);
         }
     }
-}
\ No newline at end of file
+}