diff --git a/PV_Visu/module.html b/PV_Visu/module.html
index 0f1b3b6..7e32f63 100644
--- a/PV_Visu/module.html
+++ b/PV_Visu/module.html
@@ -35,8 +35,18 @@
             document.getElementById('barPV').style.width    = data.consPV + '%';
             document.getElementById('barGrid').style.width  = data.consGrid + '%';
         }
-        function handleMessage(msg) { Apply(msg); }
-        // Kein requestAction-Aufruf hier nötig
+        function handleMessage(msg) {
+            try {
+                var data = (typeof msg === 'string') ? JSON.parse(msg) : msg;
+                Apply(data);
+            } catch(e) {
+                console.error('PV_Visu handleMessage error:', e, msg);
+            }
+        }
+        // Bind to HTML-SDK
+        if (typeof registerMessageHandler === 'function') {
+            registerMessageHandler(handleMessage);
+        }
     </script>
 </body>
 </html>
\ No newline at end of file
diff --git a/PV_Visu/module.php b/PV_Visu/module.php
index ad4d55e..56a660f 100644
--- a/PV_Visu/module.php
+++ b/PV_Visu/module.php
@@ -2,6 +2,7 @@
 
 declare(strict_types=1);
 
+
 class PV_Visu extends IPSModule
 {
     public function Create()
@@ -16,30 +17,23 @@ class PV_Visu extends IPSModule
         $this->SetVisualizationType(3);
     }
 
-    public function ApplyChanges()
+    public function ApplyChanges(): void
     {
         parent::ApplyChanges();
-        $this->RequestAction("update", 1); 
     }
 
     /**
-     * Liefert das HTML-Template und injiziert initiale Tagesdaten
+     * Liefert das HTML-Template und injiziert initiale Daten
      */
-    public function GetVisualizationTile()
+    public function GetVisualizationTile(): string
     {
-        // Tageswerte berechnen
         $start = strtotime('today 00:00');
         $end   = time();
 
-        $prodID = $this->ReadPropertyInteger('VarProduction');
-        $consID = $this->ReadPropertyInteger('VarConsumption');
-        $feedID = $this->ReadPropertyInteger('VarFeedIn');
-        $gridID = $this->ReadPropertyInteger('VarGrid');
-
-        $prod  = $this->GetDailyTotal($prodID, $start, $end);
-        $cons  = $this->GetDailyTotal($consID, $start, $end);
-        $feed  = $this->GetDailyTotal($feedID, $start, $end);
-        $grid  = $this->GetDailyTotal($gridID, $start, $end);
+        $prod   = $this->GetDailyTotal($this->ReadPropertyInteger('VarProduction'),  $start, $end);
+        $cons   = $this->GetDailyTotal($this->ReadPropertyInteger('VarConsumption'), $start, $end);
+        $feed   = $this->GetDailyTotal($this->ReadPropertyInteger('VarFeedIn'),      $start, $end);
+        $grid   = $this->GetDailyTotal($this->ReadPropertyInteger('VarGrid'),        $start, $end);
 
         // Prozent-Quoten
         $prodCons = $prod > 0 ? ($cons  / $prod) * 100 : 0;
@@ -47,7 +41,7 @@ class PV_Visu extends IPSModule
         $consPV   = $cons > 0 ? min($prod, $cons) / $cons * 100 : 0;
         $consGrid = $cons > 0 ? ($grid  / $cons) * 100 : 0;
 
-        $initialData = [
+        $data = [
             'prodCons' => round($prodCons, 1),
             'prodFeed' => round($prodFeed, 1),
             'consPV'   => round($consPV,   1),
@@ -60,24 +54,23 @@ class PV_Visu extends IPSModule
             ],
         ];
 
-        // Script zur Injektion der initialen Daten
-        $message = '<script>handleMessage(' . json_encode($initialData) . ');</script>';
+        // Daten als JSON-String übergeben
+        $json = json_encode($data);
+        $this->UpdateVisualizationValue($json);
 
-        // HTML-Template laden
+        // HTML-Template laden und zurückgeben
         $htmlPath = __DIR__ . '/module.html';
         if (!file_exists($htmlPath)) {
             $this->LogMessage("module.html nicht gefunden in $htmlPath", KL_ERROR);
             return '';
         }
-        $html = file_get_contents($htmlPath);
-
-        return $html . $message;
+        return file_get_contents($htmlPath);
     }
 
     /**
      * Callback vom HTML: sendet frische Daten
      */
-    public function RequestAction($Ident, $Value)
+    public function RequestAction($Ident, $Value): void
     {
         if ($Ident === 'update') {
             $this->UpdateData();
@@ -89,15 +82,15 @@ class PV_Visu extends IPSModule
     /**
      * Aktualisiert Daten und sendet an Tile
      */
-    public function UpdateData()
+    public function UpdateData(): void
     {
         $start = strtotime('today 00:00');
         $end   = time();
 
-        $prod  = $this->GetDailyTotal($this->ReadPropertyInteger('VarProduction'),  $start, $end);
-        $cons  = $this->GetDailyTotal($this->ReadPropertyInteger('VarConsumption'), $start, $end);
-        $feed  = $this->GetDailyTotal($this->ReadPropertyInteger('VarFeedIn'),      $start, $end);
-        $grid  = $this->GetDailyTotal($this->ReadPropertyInteger('VarGrid'),        $start, $end);
+        $prod   = $this->GetDailyTotal($this->ReadPropertyInteger('VarProduction'),  $start, $end);
+        $cons   = $this->GetDailyTotal($this->ReadPropertyInteger('VarConsumption'), $start, $end);
+        $feed   = $this->GetDailyTotal($this->ReadPropertyInteger('VarFeedIn'),      $start, $end);
+        $grid   = $this->GetDailyTotal($this->ReadPropertyInteger('VarGrid'),        $start, $end);
 
         $prodCons = $prod > 0 ? ($cons  / $prod) * 100 : 0;
         $prodFeed = $prod > 0 ? ($feed  / $prod) * 100 : 0;
@@ -117,13 +110,14 @@ class PV_Visu extends IPSModule
             ],
         ];
 
-        $this->UpdateVisualizationValue($data);
+        $json = json_encode($data);
+        $this->UpdateVisualizationValue($json);
     }
 
     /**
      * Holt Tages-Aggregat aus dem IPS-Archiv
      */
-    private function GetDailyTotal(int $varID, int $start, int $end)
+    private function GetDailyTotal(int $varID, int $start, int $end): float
     {
         if ($varID <= 0) {
             return 0.0;