PVsyst's forumhttps://forum.pvsyst.com/ Electrical string definitionhttps://forum.pvsyst.com/viewtopic.php?f=25&t=4390 Page 1 of 1

 Author: Lockyy [ Fri May 03, 2019 2:39 pm ] Post subject: Electrical string definition Hello, I have a question. If I have rows of tables 4x20 More possibilities for the stringing: 1)Each row is one string: _________ _________ _________ _________ 2)Every two rows are one string: _________ _________ _________| _________| _________ _________ _________| _________| 3) Every four rows are one string What are the number of strings in width and in height: 1) width: 1 hight: 4 2) width: 2 hight: 2 3) width: 4 hight: 1 ??? The simulation shows that 3) ist much worse than 1). But in reality in 3) for each string, only some module will be shadowed in the morning. But as I understood PVSyst, this is not how it works? If the lower modules are shadowed in 3), the whole string is influenced!? Can somebody enlight me?

 Author: dtarin [ Tue May 07, 2019 9:02 pm ] Post subject: Re: Electrical string definition Quote: What are the number of strings in width and in height: 1) width: 1 hight: 4 2) width: 2 hight: 2 3) width: 4 hight: 1 ??? Yes That is correct 1) 4 H x 1 W 2) 2 H x 2 W 3) 1 H x 4 L Quote: The simulation shows that 3) ist much worse than 1). But in reality in 3) for each string, only some module will be shadowed in the morning. But as I understood PVSyst, this is not how it works? If the lower modules are shadowed in 3), the whole string is influenced!? Can somebody enlight me? Yes, the lowest current drives the current of the string, so in #3, when the bottom modules are shaded, the entire string has reduced output. The according to strings method of shading will capture this effect for c-Si modules (setting electrical effect to 100%).