PVsystUser

I ran the same variant in PVsyst 8 and got a huge difference in near shading loss. Does it make sense? please see the highlighted cells below. the only difference between two is they were ran in two different versions:

Thanks but there is no such thing in V 7.2.16

I am adding this question under this thread as it might be a version-related issue similar to the above issue. I have two projects that are the same except for the shading layout. I see ~2% difference in the near shading loss (4.5% vs. 6.7%), which does not make sense for not such a big difference in their layout. The site is flat, and the module is First Solar so no backtracking. We have removed the trees, and the result didn't change. Could you please give us some idea of what we can check to nail down the source of the issue? We can't share the logs. Some screenshots are shared below.

Does PVsyst have any stow- strategy in the simulation when backtracking is on. The reason I am asking is because in "orientation" tab when backtracking is on, the modules will go to stow at sunrise and sunset (when moving the sun in the screen shot below to the extreme ends)

My PVsyst version is 7.2.16.

why not partition like this :

We have two location to define partitioning: List and management of objects zoning > filed properties > partition What is the difference between these two and which one should we use? When the string length is 26 in 1P, is the screen shot below, a correct way of partitioning in zoning? if yes, why we use 2 for nb. of rectangles in width and not the string length (number of modules in series)? A visual guide can help a lot. The partitioning in confusing. even in the link below , they don't say where should we put string size? It just says how to define number of modules in height, but how about width? https://www.pvsyst.com/help/project-design/shadings/electrical-shadings-module-strings/partition-in-strings-of-modules.html#summary-for-common-cases

I changed this number to different values ( 0.5, 2m, 30m) and it seems it is not reflected anywhere. at least when having multiple zones with different distance from ground , they all look to at the same heigh :

Please see the green rectangle in the screenshot below. What do the shading lines that fall inside the green square represent? That area is outside of sun path for the project's location; why they have a specific shape if they don't have any meaning?

Could you please explain why?

I have created a custom Pan File in PVsyst 8 and imported it in PVsyst 7, there are few param (eg: Rsh and Rs. ) that has been changed. What could be the reason?

How to install previous version of PVsyst? The link is not working: https://www.pvsyst.com/download-pvsyst/

If February 29th is missing from a leap year weather dataset, does it affect only that specific day, or does it impact the rest of the year as well? For example, when importing NSRDB weather data for 2020 (a leap year) into PVsyst, but excluding February 29th from the dataset: Does the PVsyst output for March 1st still correspond to the actual March 1st? Or does PVsyst treat the March 1st data from the file as February 29th, thereby shifting all subsequent days? Additionally, when running PVsyst for a specific year, does the software calculate the sun position based on that exact year (e.g., accounting for leap years), or is the sun position fixed for each calendar day regardless of the year?

- You are right, the terrain has been included in the scene and that's what is causing the issue. - PVsyst 8 crashes every time I want to import the scene and that's why I am using PVsyst 7.4 -I have shared the project and log with the support team 4 days ago, before writing here but it seems this chat was more helpful and thank you!

I haven't chosen a good word. Instead of "similar" I should have said why there are still shading when there is no tree. From your answer I realized that's might be the effect of backtracking. Although I am surprised because backtracking is activated in both runs and I have checked it few times. Could it be a glitch?