bkn Posted March 12, 2019 Share Posted March 12, 2019 Hello, guysI would like to ask you why backtracking give less yield than the one without backtracking in the simulation report of PVsyst 6.7.8.I selected "no shadings" in "Near shadings" box in "Optional" part. See below the attached pictures. My question are below with bold characters.[Monofacial case. Left:without backtracking / right: with backtracking] [bifacial case. Left:without backtracking / right: with backtracking] Some doubts cased by the statements below:1. In PVsyst help says "It should be noted that the Backtracking doesn't increase the total irradiance received. It only improves the electrical loss effects of the shadings."-> But, the report (the pictures attached) say the opposite: the system without backtracking has higher "Global incident on collection plane". Am I mistaken some part here?2. Backtracking's advantage"Though the angle of the panels is not optimal, the loss from the off-angle is typically less than the loss that would result from shading the panels, added John Williamson, director of engineering at Array Technologies."Link: https://www.solarpowerworldonline.com/2015/07/how-does-solar-backtracking-make-projects-more-productive/-> "Global incident collector plane" is higher w/o backtracking. Although, it has higher shadings loss such as "irradiance loss" and "electrical loss" compared to the one with backtracking, total energy yield present that the backtracking system is not effective strategy to improve the energy yield. Is it reasonable conclusion according to the simulation report? Am I missing something here? Simply, I cannot understand why it happen like this.Could anyone can guide me to figure out this phenomenon, please?Thanks in advance Link to comment Share on other sites More sharing options...
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