PV degradation [RE-wrenches]

[Windy Dankoff]

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Wrenches,

Perhaps you can help  me answer a question for "Ask The Experts"  
column in Home Power. It regards degradation of PV modules.

There seems to be some agreement on a norm of about 1/2% per year  
degradation (not due to dirt). This is a rough average, of course.Is  
there any general agreement on WHY this happens?

I think it's the average of a variety of factors, but if you have  
data on this issue, it may be helpful.

Also, if you have factual data on percentages of failures rates of PV  
over a long period, that will help too.

Thanks!
Windy


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