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SAT at different azimuth near shading loss

Vladislav Iliev

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I have the following staging: same site and two single axis tracker (N-S) variants:

- idenatical parameters expet the azimuth.One is 0 degree , one is -47degree.

- Backtracking is ON, Latitude  44° 49' 0" N, flat/No terrain

Results of simulation indicate better overall performance of the 47degree. Whitch contradicts with articles about performace of deviations from the 0 azimuth.

Main difference comes from near shadings.

Can someone explain those results? Comparison attached.






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  • 3 months later...

This indeed is inconsistent. We have observed recently that for trackers that do not have azimuth zero, there is a bug for a certain diffuse shadings calculation mode. I suspect this is what is happening here.

In the 3D scene, if you go to Tools > Tracker diffuse shadings definition, you can switch between the modes:

  • automatic (=central tracker above a threshold* number of trackers / = all trackers below that threshold*)
  • central tracker (fast)
  • custom tracker (fast)
  • all trackers (most accurate, slower)

The "Central tracker" and "Custom tracker" modes do not work well with azimuths away from zero because the neighbor identification fails. I would suggest to use the mode "all trackers".

* The threshold can be modified in the advanced parameters:

Read https://www.pvsyst.com/help/tracking_diffuse.htm for more details.

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