Hello,

I am trying to calculate the loss of energy when a solar panel has not the optimum inclination (22°). I calculated the incident radiation in three different ways:
1-first, I ran an interzonal adjacencies calculation and then checked the "use the existing shading masks" box.
The total radiation was 495 kWh/m², including 5 kWh/m² of diffuse radiation.

2- Then, I calculated the radiation directly by checking the "perform detailed shading calculations" box.
The total radiation was 1050 kWh/m², including 568 kWh/m² of diffuse radiation, 100 times more!!

3- Then, I calculated the shading masks with the sunpath calculation tool. After that, I calculated the incident radiation checking the "use the existing shading masks" box again.
The total radiation was 483 kWh/m², including -1,6kWh/m² of diffuse radiation!!

What is wrong here? Is this a bug or am I making a mistake?

I am including my model so you can check it.

Thank you for your help, I am pretty desperate here...

Alice