diff --git a/Bat_EV_SDL/module.php b/Bat_EV_SDL/module.php
index 7a2d9b3..284ed9b 100644
--- a/Bat_EV_SDL/module.php
+++ b/Bat_EV_SDL/module.php
@@ -119,7 +119,7 @@ class Bat_EV_SDL extends IPSModule
 
             $sdlShareKW = $sdlTotalkW/$sumBatPowerkW*$pBatkW; // SDL Power
             $evShareKW = $pBatkW - $sdlShareKW ; // EV Power
-            //$underKWh  = $sdlShareKW * $hours;// untere GRenze für SDL
+            $underKWh  = $sdlShareKW * $hours;// untere GRenze für SDL
             $underKWh = max(0.0, min($underKWh, $capKWh / 2.0));
             $upKWh = $capKWh - $underKWh ; // obere Grenze für SDL
             $SDL_kWh = 2*$underKWh; //SDL  kWh
@@ -140,8 +140,9 @@ class Bat_EV_SDL extends IPSModule
             } elseif ($upKWh < $real_kWh) {
                 $EV_SOC  = 100;
 
-                $SDL_SOC = (2*$underKWh)  / ($capKWh - $real_kWh + $underKWh) * 100;
-
+                //$SDL_SOC = (2*$underKWh)  / ($capKWh - $real_kWh + $underKWh) * 100;
+                $den = ($capKWh - $real_kWh + $underKWh);
+                $SDL_SOC = ($den > 0) ? ((2*$underKWh) / $den * 100.0) : 0.0;
 
                 $sdlDisKW =  $sdlShareKW; // SDL-
                 $evDisKW  = $evShareKW; // EV-