Dan Nicksy Posted November 27, 2015 Share Posted November 27, 2015 Good afternoon,I have created a PVsyst model, including a near shading scene (NSS). Modules are installed flush mounted to a low-slope roof; I have modeled this as follows: Nb. Sheds = 1; Nb. X Modules = 39; Nb. Y Modules = 15. In order to represent individual strings within the array, I have partitioned according to module strings as follows: Nb. String in X = 3; Nb. Strings in Y = 15; Fraction for Electrical Effect = 100%. It is my understanding that this divides the shed (39 modules by 15 modules) into 45 strings (13 modules by 1 module each), and that if any part of a string is shaded, that entire string is treated as electrically ineffective (i.e. does not generate any power); I recognize that this may be overly punitive. The roof has a number of air conditioning units and ducts, modeled as elementary shading objects (parallelepipede, portion of cylinder). I ran the simulation three different ways: No shading, Linear Shading, Shading according to module strings. I found that the shading loss was identical for both Linear Shading and Shading according to module strings; I verified this by outputting hourly Shading Loss to CSV. In order to test how PVsyst was behaving, I partitioned the entire shed (39 modules by 15 modules) into a single partition, such that if any part of the shed was shaded the entire shed should be electrically inactive. Again, I found that the simulation run with Linear Shading and Shading according to module strings yielded identical values. Am I misunderstanding the "Partition in Module Chains" or the "Fraction for Electrical Effect" functions? (I have read the help documentation on both topics) Is this a known occurrence in PVsyst V6.39? Is there a justifiable reason that the production should be the same between Linear Shading and Shading according to module strings? Thank you in advance for any help you are able to provide,Dan Link to comment Share on other sites More sharing options...
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