PV power tolerance [RE-wrenches]

[Ray Walters]

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Thanks Randy, Doug, & Bill for responding;

As usual there is not a complete consensus, but for my purposes, I'll just 
use the large framed panel warranty of 80% rated power at 20 years. All of 
your info seems to  agree on that.
  The little laminate modules (regardless of brand) seem to deteriorate 
horribly in the UV at this altitude. I won't hold any manufacturer to that 
junk, but I Do wish they'd quit selling it. The plastic yellows, then 
cracks, then delaminates and allows moisture into the solder joints. Total 
time in the field: 2 to 3 years. Imagine if our big installs did that?

Thanks again, (I love this list)

Ray


>Ray, all UniSolar rigid-framed modules, 25 watts and up are rated to
>deliver within 10% of rated output at 10 years, and within 20% of rated
>output at 20 years. Smaller rigid-frames are just 10% at 10 years.
>Marine modules (soft frame) are 10% at 3 years. Peel 'n stick modules
>for metal roofing are 20% @ 20 years *if* installation is supervised by
>a licensed installer. (Gotta take one of their classes for that.)
>
>Cheers,
>Doug Pratt

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