PV degradation [RE-wrenches]

[Lance Barker]

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Although it's somewhat anecdotal, our eperience agrees with Brian's. As 
we have both Arco ASI16-200s (over 25 years old) and Arco M-53s (a 
ltttle less old, but close), and measuring their output with an OutBack 
MX-60 charge controller, compared to newer modules on a separate OutBack 
charge controller at the same time, the output compared to rating has 
degraded only slightly (nowhere near the advertised percentage). Other 
brands of mudules that we have had for long periods did not fare so 
well, and have been traded away...
Lance

Windy Dankoff wrote:

>
> 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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