diff --git a/Bat_EV_SDL_V4/module.php b/Bat_EV_SDL_V4/module.php
index b22c77e..46f981b 100644
--- a/Bat_EV_SDL_V4/module.php
+++ b/Bat_EV_SDL_V4/module.php
@@ -135,7 +135,8 @@ class Bat_EV_SDL_V4 extends IPSModule
                 "SDL_W" => round((float)GetValue($this->GetIDForIdent("Aktuelle_Leistung_SDL")), 0)
             ];
 
-            $this->SetIdentValue("CalcJSON", json_encode($calc, JSON_PRETTY_PRINT));
+            $calcRounded = $this->RoundArray($calc, 3);
+            $this->SetIdentValue("CalcJSON", json_encode($calcRounded, JSON_PRETTY_PRINT));
 
         } catch (Throwable $e) {
             $this->SendDebug("Update ERROR", $e->getMessage() . " @ " . $e->getFile() . ":" . $e->getLine(), 0);
@@ -796,6 +797,22 @@ class Bat_EV_SDL_V4 extends IPSModule
         }
     }
 
+    private function RoundArray($data, int $decimals = 3)
+    {
+        if (is_array($data)) {
+            foreach ($data as $k => $v) {
+                $data[$k] = $this->RoundArray($v, $decimals);
+            }
+            return $data;
+        }
+
+        if (is_float($data)) {
+            return round($data, $decimals);
+        }
+
+        return $data;
+    }
+
     private function SetIdentValue(string $ident, $value): void
     {
         $id = @$this->GetIDForIdent($ident);