diff --git a/Helios/Source/SolarPanel.cs b/Helios/Source/SolarPanel.cs
index 4dcb9ad0c10aff54fecc7a9cfc6bc105c98a2623..b59b44a40181eb342235eb34a251449ba15cd371 100644
--- a/Helios/Source/SolarPanel.cs
+++ b/Helios/Source/SolarPanel.cs
@@ -47,7 +47,7 @@ namespace Helios.Source
         {
             double costPerWatt;
 
-            costPerWatt = this.InstallationCost * this.PowerOutput;
+            costPerWatt = this.InstallationCost / this.PowerOutput;
 
             this.CostPerWatt = costPerWatt;