PVstudent - Solar Education Resource
RSS Follow Become a Fan

Delivered by FeedBurner


Recent Posts

Advancement and Development of Electricity and Technology
Building Integrated PV
Bypass diodes
Determining low temperature that caused the inverter to go over voltage
Another NABCEP PVIP Certificate in the mail!

Most Popular Posts

Feeder PV Connections 705.12(D)(2)(1)(b)
Crimping MC4 Connectors without the tool
Converting kWh to pounds of CO2
NEC 310.15(A)(2) Exception, 10% or 10 feet or less for sizing conductors
Bonding Neutral to Ground

Categories

Advanced PV Course
NABCEP PV Installation Professional Exam Prep Course
NABCEP PV Technical Sales Exam Study Group (which will evolve into a full course)
PV Boot Camp and NABCEP Entry Level Exam Prep Course
powered by

HeatSpring PV Course Blog

Shading, bypass diodes, portrait and landscape


Q:

Hi Sean,
The layout of an array, landscape vs portrait was to install as many modules as possible in the available space, maximizing the size of the system. From your discussion regarding the bypass diode, I note that if there were any shading issues, orientation of the module, when positioned in landscape will have the least affect on the functionality of the bypass diode and thus module output.
Thanks

A:

That is correct for typical crystalline PV assuming the normal shadow pattern with the shadow coming from the lower part of the module as with inter-row shading as opposed to a shadow coming from the side. This way we will take one third of the module's production rather than all of it if the shadow was shading 1 row of cells.

Note: if the entire string is shaded with MPPT, then the PV source circuit would operate as if the entire string was in the shade, since shaded cells can operate at a substantial decrease in output.

Another note: with thin film PV, the cells are in stripes, so the PV will be oriented so that the stripes are north to south and the inter-row shadow will shade all of the cells the same and then shading is directly proportional to production (no series penalty if cells are all shaded the same).

Thanks,
Sean White



0 Comments to Shading, bypass diodes, portrait and landscape:

Comments RSS

Add a Comment

Your Name:
Email Address: (Required)
Website:
Comment:
Make your text bigger, bold, italic and more with HTML tags. We'll show you how.
Post Comment
Website Builder provided by  Vistaprint