diff --git a/csharp/App/Backend/DataTypes/Installation.cs b/csharp/App/Backend/DataTypes/Installation.cs
index 6596d797a..9710d81b3 100644
--- a/csharp/App/Backend/DataTypes/Installation.cs
+++ b/csharp/App/Backend/DataTypes/Installation.cs
@@ -43,6 +43,8 @@ public class Installation : TreeNode
     public int Product          { get; set; } = (int)ProductType.Salimax;
     public int Device           { get; set; } = 0;
     public string SerialNumber  { get; set; } = "";
+    public string InverterSN  { get; set; } = "";
+    public string DataloggerSN  { get; set; } = "";
     
     [Ignore]
     public String OrderNumbers  { get; set; }
diff --git a/csharp/DataCollectorWebApp/Controller.cs b/csharp/DataCollectorWebApp/Controller.cs
index e5b13d481..c58c739fe 100644
--- a/csharp/DataCollectorWebApp/Controller.cs
+++ b/csharp/DataCollectorWebApp/Controller.cs
@@ -40,7 +40,8 @@ public class Installation
     public int Product { get; set; } = 0;
     public int Device           { get; set; } = 0;
     public string SerialNumber  { get; set; } = "";
-
+    public string InverterSN  { get; set; } = "";
+    public string DataloggerSN  { get; set; } = "";
     public String OrderNumbers  { get; set; }
     public String VrmLink       { get; set; } = "";
 }