diff --git a/Bat_EV_SDL _V2/module.php b/Bat_EV_SDL _V2/module.php
index f372f81..9055645 100644
--- a/Bat_EV_SDL _V2/module.php	
+++ b/Bat_EV_SDL _V2/module.php	
@@ -140,7 +140,7 @@ class Bat_EV_SDL_V2 extends IPSModule
                 // --- Deine 3 Fälle ---
                 if ($underKWh <= $real_kWh && $upKWh >= $real_kWh) {
 
-                    $SDL_SOC = 50.0;
+                    $SDL_SOC = 100 / ($upKWh + $underKWh) * $underKWh;
                     $EV_SOC  = ($capKWh > 0.0) ? (($real_kWh - $underKWh) * 100.0 / $capKWh) : 0.0;
 
                     $sdlDisKW = $sdlShareKW_entladen;