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Incorrect shading frequency


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While designing a PV system over a 3D OBJ (captured in drone deploy and exported on ReCap) the result of the simulation was 15000kwh/year. It is a system surrounded by 2 buildings, with lots of shading.

After the system was installed, the efficiency was aroung 30% of the simulated values. Reviewing the 3D simulation, I noticed that the shading simulation was incorrect, with values around 3% where it should be higher.

So, I designed walls to simulate the building walls, and turns out that the simulation result became very close to the actual generation. Se attached pictures with and without the walls.

It seems like PvSol cogeneratedBy_react-csv (2).csvnsidered the actual 3D model as "transparent" or something like that. What is the reason and correction for this behaviour?


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Hello DMA,

thank you for your request and testing the shading frequency.

Unfortunately there is a bug in the calculation of the shading frequency values.
Even small movements of the mounting surfaces result in big deviations of the values.

Please have a look into the following thread:

Kind regards,

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Hello Frederik

Thank you for your support in advance.

In the linked thread you state that this only affects the shading frequency and does not affect the yield. In my scenario it does affect the generation as well.

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  • 3 months later...

Hello dear Frederik

Have you analyzed this issue? As precaution, I am now using a solid block anytime I have a significant shadow, and the result is always a higher shading loss.

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