j.meier Posted January 21, 2016 Share Posted January 21, 2016 Hi all,thanks for the new v6.40 and all the improvements I have seen so far, but:I have noticed that since I have updated to 6.40 the shadings: electrical loss acc to stings are twice as high as for PVsyst 6.39.I used the same simulation variant, same system same losses, just recalculated the shading table and noticed that these losses increased from around 1% to around 2%.Was the loss calculation underestimated in the older versions or is there another special reason for this?Can you please explain this change?Looking forward for your reply. Link to comment Share on other sites More sharing options...
Bruno Wittmer Posted January 26, 2016 Share Posted January 26, 2016 The electrical loss according to strings depends strongly on the specific details of the simulation. Could you send your project (or a minimal example where you observe the behavior) to support@pvsyst.com, so we can have a look at it?We did not introduce any fundamental change in this calculation, so we do not expect major differences in the results of V6.39 and 6.40. Link to comment Share on other sites More sharing options...
deblynn Posted January 31, 2016 Share Posted January 31, 2016 I just observed the same change as well from 6.39 to 6.40. Link to comment Share on other sites More sharing options...
j.meier Posted February 2, 2016 Author Share Posted February 2, 2016 I did send an example project.Do you have any update regarding this topic?I noticed that the difference still occurs in PVsyst 6.41. Link to comment Share on other sites More sharing options...
Jen H Posted February 4, 2016 Share Posted February 4, 2016 I am having the same problem too. When I export a project from 6.39 into version 6.41 and recompute the shading table, sometimes there is a small difference in linear shading but bigger difference in electrical shading, which can translate to a significant difference in electrical shading loss between the two versions. I've attached a project to this post as a reference. The differences in electrical shading factor (shading factor according to strings) between version 6.39 and 6.41 is below: I did not change anything in the simulation other than recomputing the shading table. P.S. In 6.41 the shading table is calculated much more quickly than for previous versions, so thank you!Bedford_Project.zip Link to comment Share on other sites More sharing options...
Bruno Wittmer Posted February 15, 2016 Share Posted February 15, 2016 When doing the calculation according to strings, there is indeed a bug in V6.40 and V6.41, causing some of the shaded areas to be counted twice, resulting in too large electrical shading factors.The fix is being worked on. Link to comment Share on other sites More sharing options...
Bruno Wittmer Posted February 16, 2016 Share Posted February 16, 2016 The bug has been fixed for PVsyst V6.42, to be released in the coming days. Link to comment Share on other sites More sharing options...
Jen H Posted February 16, 2016 Share Posted February 16, 2016 Many thanks for looking into this. Looking forward to the update! Link to comment Share on other sites More sharing options...
masheets Posted April 6, 2016 Share Posted April 6, 2016 Was this bug also in V6.39? I noticed a sharp increase in production estimates when I upgraded from V6.39 to V6.43 when using detailed electrical calculations due to module layout with optimizers. I ran an old variant in the new version to compare, and saw "Near Shadings: irradiance loss" decrease from -17% to -9.4%, and "Shadings: Electrical Loss detailed module calc" decrease from -6.7% to -2% (this project is in a very shady area). The resulting production estimate difference is %15, and I would like to make sure the new result is accurate before I finalize my recommendation.Thanks. Link to comment Share on other sites More sharing options...
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