diff --git a/csharp/App/SaliMax/src/AggregationService/HourlyData.cs b/csharp/App/SaliMax/src/AggregationService/HourlyData.cs
new file mode 100644
index 000000000..a47db1c74
--- /dev/null
+++ b/csharp/App/SaliMax/src/AggregationService/HourlyData.cs
@@ -0,0 +1,92 @@
+using System.Text.Json;
+using InnovEnergy.App.SaliMax.Devices;
+using InnovEnergy.Lib.Utils;
+using static System.Text.Json.JsonSerializer;
+
+namespace InnovEnergy.App.SaliMax.AggregationService;
+// shut up trim warnings
+#pragma warning disable IL2026  
+
+public class HourlyData //TODO: let IE choose from config files (Json) and connect to GUI
+{
+    private static String DefaultHDataPath => Path.Combine(Environment.CurrentDirectory, "HourlyData/config.json");
+
+    private static readonly JsonSerializerOptions JsonOptions = new() { WriteIndented = true };
+
+    public required Double  MinSoc                      { get; set; } 
+    public required Double  MaxChargeBatteryVoltage     { get; set; }
+    public required Double  MinDischargeBatteryVoltage  { get; set; }
+    private static String?  LastSavedData               { get; set; }
+    
+    #if DEBUG 
+    public static HourlyData Default => new()
+    {
+        MinSoc                      = 20,
+        MaxChargeBatteryVoltage     = 0,
+        MinDischargeBatteryVoltage  = 0
+ 
+    };
+    #else 
+    public static HourlyData Default => new()
+    {
+        MinSoc                      = 20,
+        MaxChargeBatteryVoltage     = 0,
+        MinDischargeBatteryVoltage  = 0
+
+    };
+    #endif
+
+    public void Save(String? path = null)
+    {
+        var dataFilePath = path ?? DefaultHDataPath;
+        
+        try
+        {
+            var jsonString = Serialize(this, JsonOptions);
+
+            if (LastSavedData == jsonString)
+                return;
+            
+            LastSavedData = jsonString;
+
+            File.WriteAllText(dataFilePath, jsonString);
+        }
+        catch (Exception e)
+        {
+            $"Failed to write config file {dataFilePath}\n{e}".LogInfo();
+            throw;
+        }
+    }
+    
+    public static HourlyData Load(String? path = null)
+    {
+        var dataFilePath = path ?? DefaultHDataPath;
+        try
+        {
+            var jsonString = File.ReadAllText(dataFilePath);
+            return Deserialize<HourlyData>(jsonString)!;
+        }
+        catch (Exception e)
+        {
+            $"Failed to read config file {dataFilePath}, using default config\n{e}".WriteLine();
+            return Default;
+        }
+    }
+    
+    
+    public static async Task<HourlyData> LoadAsync(String? path = null)
+    {
+        var dataFilePath = path ?? DefaultHDataPath;
+        try
+        {
+            var jsonString = await File.ReadAllTextAsync(dataFilePath);
+            return Deserialize<HourlyData>(jsonString)!;
+        }
+        catch (Exception e)
+        {
+            Console.WriteLine($"Couldn't read config file {dataFilePath}, using default config");
+            e.Message.WriteLine();
+            return Default;
+        }
+    }
+}
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