S.Faulkner Posted August 19, 2015 Share Posted August 19, 2015 It appears that there is no shading electrical loss for diffuse irradiance, and I am wondering why?I noticed this when modelling a large tracking system with backtracking ie no shading of the beam component, which gives an irradiance loss of about 1% but zero electrical loss (According to module strings, 100% electrical effect). I set albedo to zero so that there is no related loss to confuse matters, ie the irradiance loss is entirely diffuse. I think I have set it up correctly but this lack of electrical loss makes me wonder. I'm expecting the electrical loss in this case to be roughly 1%. If I understand correctly, it should be at least as large as the irradiance loss, and can't be zero since the cells at the lowest point on the module see a smaller portion of the sky than the higher up cells.If I turn off backtracking there is as expected more irradiance loss (beam as well as diffuse) and an electrical loss that is larger than the irradiance loss, apparently coming only from shading of beam irradiance.As a check with no backtracking, I set the horizon very high so all the beam irradiance is blocked, and got a similar result - some irradiance shading loss but no associated electrical shading loss. So, what could be stopping the electrical loss, is this incorrect, or have I misunderstood something? (I have used 100% electrical effect and calculated According to modules strings) Link to comment Share on other sites More sharing options...
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