diff --git a/csharp/App/Backend/DataTypes/Installation.cs b/csharp/App/Backend/DataTypes/Installation.cs
index e1e12a436..b7553afe7 100644
--- a/csharp/App/Backend/DataTypes/Installation.cs
+++ b/csharp/App/Backend/DataTypes/Installation.cs
@@ -45,6 +45,7 @@ public class Installation : TreeNode
     public string SerialNumber  { get; set; } = "";
     public string InverterSN  { get; set; } = "";
     public string DataloggerSN  { get; set; } = "";
+    public int BatteryClusterNumber           { get; set; } = 0;
     
     [Ignore]
     public String OrderNumbers  { get; set; }