Pierre Chatenay

I agree with Jonipa here, for me the near shading especially in a utility scale project on trackers with backtracking, and potentially as well some of IAM factor loss which are already measured by our pyranometers in the plane of array (GPOA). Ultimately the question is what does my pyranometers installed in the plane of array directly on my trackers for utility scale of my site, cleaned daily, Bifacial modules and Backtracking scenario measure? 1- GPOA onsite= Global inc? 2- GPOA onsite= Global Inc - (near shading: Irradiance loss)+ ground reflection on front side? 3- GPOA onsite= Global Inc - near shading - IAM losses + ground reflection on front side 4- Other? Does PVSYST have any opinion on this? Thanks in advance,

Dear Bapossatto, I also believe that the pyranometers onsite are reading something in between Global Inc and Glob Eff and i would like to know more from PVSYST about this split. If i am not mistaken, GlobInc= Glob Eff+ Near Shadings: irradiance loss + IAM + Soiling +/- Ground reflection on front side. I am not sure though if this near shading loss would have an impact on a tracking system with backtracking since the near shading loss due to the diffuse and albedo component might be minor. Also for soiling, the pyranometer needs to be cleaned daily to be able to consider GlobInc as you pyranometer reading (particularly in desert conditions). Could someone enlighten us on this? Thanks,