smeredith Posted November 9, 2020 Share Posted November 9, 2020 Hi,First off, I'm using PVsyst version 7.0.16.I'm trying to modify a PAN file based on a third-party PAN file that I was provided. When I opened the PAN file in PVsyst, I noticed that the RSerie parameter got changed from 350 to 500. As an experiment, I didn't make any edits to the file and immediately closed it in PVsyst. I then opened the PAN file in a text editor and saw that the value was still 350.But then I re-opened the PAN file in PVsyst, made some edits to the PAN file (I didn't change RSerie), then saved the file as a new file. When I opened the PAN file in a text editor, the value had changed to 500.This seems like a bug that's unique to version 7, because I did the same things in version 6 and I had no problems there. Link to comment Share on other sites More sharing options...
smeredith Posted November 24, 2020 Author Share Posted November 24, 2020 Just wanted to give an update.Today I was opening a manufacturer-provided PAN file in 7.0.16, and I noticed that PVsyst again changed a parameter when I opened it - this time it was Voc (went from 53.5 to 31.2).Additionally, I noticed that when I went to change the number of cells in parallel from 1 to 2 and the cell area from 328.9 to 165, that PVsyst also changed the following parameters:1. RSerie (went from 0.255 to -2.781)2. Gamma (went from 1.151 to 4.620)3. muGamma (went from -0.0004 to 0.0200)I updated my PVsyst version to 7.0.17 and the error still persisted. Link to comment Share on other sites More sharing options...
eye4u Posted December 14, 2020 Share Posted December 14, 2020 Hi,I'm wondering if you've solved the problem. I have exactly the same problem as you did.Thank you. Link to comment Share on other sites More sharing options...
smeredith Posted December 14, 2020 Author Share Posted December 14, 2020 Hi eye4u,No, unfortunately this problem has persisted at least through 7.0.17. I haven't downloaded 7.1.0 yet, so I can't say for sure if the problem has been fixed in that version.For now, I need to use PVsyst 6 to edit any PAN files. Link to comment Share on other sites More sharing options...
smeredith Posted March 4, 2022 Author Share Posted March 4, 2022 This post is old, but I think is still relevant. I can give some background to those that are experiencing this error.PVsyst is constantly changing the way that it determines the default values for the single-diode parameters Rseries, Rshunt, and Rshunt at g=0. The implication is that you may get a different default value for a parameter if you open the PAN file in version 6.88 vs. if you open that same PAN file in a later version.This is not a problem if you are opening the PAN file in the same (or a similar) version that it was created in - but I would argue based on the wide variety of versions I've seen used to create PAN files - that this is rarely the case. This is why I argue in a different post that PVsyst needs to either do away with default values for these parameters or else come up with a consistent methodology for determining default values regardless of PVsyst version. Because if you don't, you're going to end up with a different module model for the same PAN file depending on what version you're using. Link to comment Share on other sites More sharing options...
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