gpuy Posted November 23, 2022 Share Posted November 23, 2022 I would like to know if there is a reason for not obtaining "electrical loss acc. to string" when using a Horizontal Tracking System and simulating as "According to Module Strings", regardless of the "fraction for electrical effect". With fixed structures, there is "electrical loss acc. to string" when simulating as "According to Module Strings", since shadows generate mismatch of electrical response of the modules in series and strings in parallel. I was expecting the same for Horizontal Tracking Systems (despite backtracking) since once there are shadows ("near shadings: irradiance loss" is not 0), the mismatch of electrical response of the modules would cause a loss. Link to comment Share on other sites More sharing options...
Michele Oliosi Posted November 24, 2022 Share Posted November 24, 2022 The "Near shadings: irradiance loss" also includes diffuse shadings. In PVsyst we consider that these do not produce any electrical mismatch. It seems that your backtracking is working well, since the electrical losses according to strings are 0%. Link to comment Share on other sites More sharing options...
gpuy Posted November 24, 2022 Author Share Posted November 24, 2022 2 hours ago, Michele Oliosi said: The "Near shadings: irradiance loss" also includes diffuse shadings. In PVsyst we consider that these do not produce any electrical mismatch. It seems that your backtracking is working well, since the electrical losses according to strings are 0%. Thank you for your answer Michele. I´ve checked the ShdBLss (Loss on the beam component), ShdDLss (Loss on the diffuse component), and ShdALss (Loss on the albedo component). They represent the next porcentage of the total shading loss: ShdBLss: 20% ShdDLss: 38% ShdALss: 42% Since ShdBLss > 0, is it still normal to have electrical losses according to strings of 0%? Link to comment Share on other sites More sharing options...
Michele Oliosi Posted November 28, 2022 Share Posted November 28, 2022 Hmm indeed that doesn't seem normal. I'd try to try and recompute the shading factor tables, if you are using the tables. If that still doesn't change the results, I would suggest sending us your project (exported via the main window > File > Export project). We'll be then able to review if any parameter is causing that or if there is a bug to be corrected. Link to comment Share on other sites More sharing options...
gpuy Posted December 1, 2022 Author Share Posted December 1, 2022 On 11/28/2022 at 9:58 AM, Michele Oliosi said: Hmm indeed that doesn't seem normal. I'd try to try and recompute the shading factor tables, if you are using the tables. If that still doesn't change the results, I would suggest sending us your project (exported via the main window > File > Export project). We'll be then able to review if any parameter is causing that or if there is a bug to be corrected. Thank you for your support, Michele. Since recomputing the shading factor tables didn´t change anything, I´would like to send you the project. Shall I do that via email? Link to comment Share on other sites More sharing options...
Michele Oliosi Posted December 2, 2022 Share Posted December 2, 2022 Yes ! You can send at support@pvsyst.com Link to comment Share on other sites More sharing options...
MNWild Posted March 3, 2023 Share Posted March 3, 2023 Following Link to comment Share on other sites More sharing options...
Elivelton Freitas Posted August 23, 2023 Share Posted August 23, 2023 how was this case resolved? Link to comment Share on other sites More sharing options...
Michele Oliosi Posted August 24, 2023 Share Posted August 24, 2023 In the end, the results were consistent with the backtracking (on flat ground, therefore ShdElec = 0). So no issue after all. Did anyone experience the same issue ? Or were you following by interest ? Link to comment Share on other sites More sharing options...
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