diff --git a/Bat_EV_SDL_V3_Beta/module.php b/Bat_EV_SDL_V3_Beta/module.php
index c5ca9ed..6d83f6c 100644
--- a/Bat_EV_SDL_V3_Beta/module.php
+++ b/Bat_EV_SDL_V3_Beta/module.php
@@ -27,6 +27,10 @@ class Bat_EV_SDL_V3_Beta extends IPSModule
         $this->RegisterVariableInteger("P_EV_laden",     "P EV laden max (W)",     "", 31);
         $this->RegisterVariableInteger("P_EV_entladen",  "P EV entladen max (W)",  "", 32);
         $this->RegisterVariableFloat("SDL_Start_Pos", "SDL Start SoC (%)", "", 35);
+        
+        $this->RegisterVariableBoolean("SDL_Reset", "SDL Konto Reset (Start)", "~Switch", 36);
+        $this->EnableAction("SDL_Reset");
+
         // Debug
         $this->RegisterVariableString("CalcJSON", "Berechnung (JSON)", "", 99);
         // Timer: wichtig -> Prefix muss passen
@@ -42,6 +46,7 @@ class Bat_EV_SDL_V3_Beta extends IPSModule
         
         $this->Update();
     }
+
     public function RequestAction($Ident, $Value)
     {
         if ($Ident === "State") {
@@ -51,8 +56,21 @@ class Bat_EV_SDL_V3_Beta extends IPSModule
             }
             return;
         }
+
+        if ($Ident === "SDL_Reset") {
+            if ((bool)$Value) {
+                $this->ResetSDLToStartPoint();   // setzt Buffer auf Startzustand
+                SetValue($this->GetIDForIdent("SDL_Reset"), false); // Schalter automatisch zurück
+                $this->Update(); // optional: sofort Anzeige aktualisieren
+            } else {
+                SetValue($this->GetIDForIdent("SDL_Reset"), false);
+            }
+            return;
+        }
+
         throw new Exception("Invalid Ident: " . $Ident);
     }
+
 public function Update()
 {
     $semKey = 'BatEVSDL_Update_' . $this->InstanceID;
@@ -972,6 +990,49 @@ private function WriteByVendorRegistersSingleMode(string $typ, array $cfg, float
 }
 
 
+private function ResetSDLToStartPoint(): void
+{
+    // Cache sicherstellen (damit underKWh/SDL_kWh_total aktuell sind)
+    $this->BuildBatteryCache(true);
+
+    $cache = json_decode($this->GetBufferSafe("BatCacheJSON"), true);
+    if (!is_array($cache) || empty($cache["bats"])) {
+        $this->SendDebug("SDL_Reset", "Cache leer/invalid", 0);
+        return;
+    }
+
+    $sdlKWhTotal = 0.0;
+    $startKWh    = 0.0;
+
+    foreach ($cache["bats"] as $bat) {
+        $sdlKWhTotal += (float)($bat["SDL_kWh_total"] ?? 0.0);
+        $startKWh    += (float)($bat["underKWh"] ?? 0.0);
+    }
+
+    if ($sdlKWhTotal <= 0.0) {
+        $this->SendDebug("SDL_Reset", "SDL_kWh_total = 0", 0);
+        return;
+    }
+
+    // Startzustand = Summe underKWh (bei symmetrisch => exakt 50%)
+    $startKWh = max(0.0, min($sdlKWhTotal, $startKWh));
+
+    $this->SetBuffer("Int_E_SDL_kWh", (string)$startKWh);
+    $this->SetBuffer("Int_Init_SDL", "1");
+    $this->SetBuffer("Int_LastTs", (string)microtime(true));
+
+    // Hash merken, damit dein "ApplyChanges-Resync" nicht direkt wieder reinfunkt
+    $cacheHash = (string)$this->GetBufferSafe("BatCacheHash");
+    if ($cacheHash !== "") {
+        $this->SetBuffer("Int_CFG_HASH", $cacheHash);
+    }
+
+    // Optional: direkt Debug ausgeben
+    $startPct = ($sdlKWhTotal > 0.0) ? ($startKWh / $sdlKWhTotal * 100.0) : 0.0;
+    $this->SendDebug("SDL_Reset", "StartKWh=" . round($startKWh,3) . " (" . round($startPct,3) . "%)", 0);
+}
+``
+
 
 private function GetTotalBatteryPowerIstW(): float
 {