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is it more cost efficient to repair a solar cell, or to replace it?

Yes, it is more cost effective to replace the solar cell.   1 vote - 50 %
No, it is not more cost effective to replace a solar cell.   1 vote - 50 %
 
2 Total Votes
Efficiency of the repair of solar cells | 4 comments (4 topical)
Re: Efficiency of the repair of solar cells (3.00 / 0) (#1)
by DamonHD on Tue Feb 10, 2009 at 08:05:56 AM MST

It might be helpful to distinguish between repairing/replacing individual cells (within a panel/module) rather than whole panels/modules which would normally be the field-replacable unit IMHO.

I should imagine that many types of panels/modules would not take at all kindly to being opened up.

Rgds

Damon
"Once you have licked the windows of freedom your tongue gets stuck."



Re: Efficiency of the repair of solar cells (3.00 / 0) (#2)
by electronbaby on Tue Feb 10, 2009 at 02:37:11 PM MST

Modules can be "opened up". They need to be uniformly heated to remove the laminant backing and encapsulant. Manufacturers are doing this as we speak on past failed lots of modules and reselling or replacing defective units in the field.

The need for this usually is not too often and modules for the most part are pretty durable. Ground faults, lightning hits, and other electrical failures/shorts dont usually hurt PV modules unless there are many strings back-feeding into a single string. This usually makes the bypass diodes fail.

The single most vulnerable component of pv modules are the bypass diodes. These usually can be replace relatively easily, with the exception of many amorphous pv modules which might have them located on each cell enclosed in the laminant.

hope this helps
Have Fun!! RoyR KB2UHF



Re: Efficiency of the repair of solar cells (3.00 / 0) (#3)
by poprox198 on Wed Feb 11, 2009 at 08:24:27 AM MST

Thank you for your comments. For clarification, my lab partner and I are geared towards repairing physically broken cells, as well as the panel as a whole.



Re: Efficiency of the repair of solar cells (3.00 / 0) (#4)
by ghurd on Wed Feb 11, 2009 at 08:44:44 AM MST

I have seen a lot of panels that had bad things done to them.
I do not recall a physically broken cell, unless the entire panel was smashed.

I saw a panel that was smashed (no glass left on the front), but still working fine. No cells showed obvious damage.  I doubt it worked very long after.

If one cell was broken in a standard 36 cell module, the most cost efficient solution would be to simply bypass that cell.

I have a gut feeling...
The module output is based on the area of a cell.  If a broken cell is repaired, the surface area would be reduced.  The output would likely go down more than removing the broken cell from the circuit.
It would be an interesting experiment either way.
G-
Ghurd.info



Efficiency of the repair of solar cells | 4 comments (4 topical)
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