Grouped array of trackers in near shade scene have more shading than ungrouped in V7.4.8

[Andres B]

I was running generic simulations and noticed that when I ungrouped the array of trackers I made in the near shade scene the production was higher. The only difference between the two variants below is just whether the created array of trackers was ungrouped or not after creating them in the near shade scene. The grouped trackers has a higher near shadings loss of ~2% for no apparent reason that goes away if you ungroup the array of trackers. 

[Michele Oliosi]

Hi, this is likely because of the diffuse shading losses calculation.
In version 7.4.8, you can check the details from the 3D scene window > Tools > Trackers diffuse shadings definition. If it is automatic, there is a chance that by ungrouping, PVsyst picked a representative tracker for the calculation (see the “central tracker” choice), which is not really representative. (2% losses is more realistic !)

See https://www.pvsyst.com/help-pvsyst7/tracking_diffuse.htm

or https://www.pvsyst.com/help/project-design/shadings/calculation-and-model/diffuse-losses-with-tracking-systems.html for the v8 help.