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PostPosted: Thu Aug 17, 2017 9:30 pm 

Joined: Fri Nov 25, 2016 3:12 am
Posts: 2
While defining the Electrical effect on the mutual shadings in Unlimited sheds field type, what should be number of strings(transverse) in the width of the row? Much appreciated if explained with an example.


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PostPosted: Fri Aug 25, 2017 10:36 pm 
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Joined: Mon Apr 16, 2012 7:29 pm
Posts: 1601
If you have only one row of modules in your shed (whatever portrait or landscape), this will be one.
If you have two rows belonging to different strings, this will be 2.
If you have two rows belonging to one the same strings, this will be 1.


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PostPosted: Sat Sep 16, 2017 1:05 pm 

Joined: Sat Sep 16, 2017 12:44 pm
Posts: 1
in shed optimization is the analysis performed under clear sky model ? So the results do not depend really on the chose place.


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PostPosted: Thu Feb 01, 2018 6:22 pm 

Joined: Wed Jan 31, 2018 10:35 pm
Posts: 9
Ok, Then
If we have only one row of modules(but 2 strings) in your shed (whatever portrait or landscape), this will be 2?, Or still one?


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PostPosted: Fri Feb 02, 2018 5:20 pm 
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Joined: Mon Apr 16, 2012 7:29 pm
Posts: 1601
It is one module in the width of the shed of course.


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PostPosted: Fri Aug 09, 2019 6:53 pm 

Joined: Fri Jul 07, 2017 3:27 pm
Posts: 28
Is there a way to simulate shading impacts to discrete bypass diodes? For example, within a module I'm likely to lose voltage in groups of 3 when in landscape orientation, or 1 in portrait. For half cell modules, I'd lose voltage in groups of 3 in landscape, and groups of 2 in portrait. Would it be appropriate to define electrical effect on the mutual shadings based on these values, when they are not individual "strings" in the system definition, but rather individual circuits within the string?

Update: I did just find this post viewtopic.php?t=1594 helpful in understanding why not to consider bypass diodes when you have more than two strings per MPPT in landscape orientation. What about the other cases where bypass diodes do have an effect, such as 1-2 strings per mppt? What about when the whole array is shaded as one, such as a tracker array with 1 half-cell module up in portrait? When half of a module is shaded, all of the array is experiencing more or less the same thing (half voltage). In this scenario, would you recommend assuming 2 "strings" in the width of the single module? I suppose it's rather unlikely that you'd reach your minimum input voltage at the inverter, in that case.


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