PV Module Degradation (was PV Inverters module strings) [RE-wrenches]

[Windy Dankoff, Dankoff Solar]

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>On output warranties: I asked Photowatt/Matrix about warranty issues a year
>or two ago. They had (have) a 10 year warranty against >10% degradation. If
>I wanted it, for a few dollars/module more they'd give me a 20 year warranty
>against >20% degradation. You figure it out.
>Allan @+E


Allan -- I've seen module specs stated on the spec sheet as +/-  as 
much as 10%. That's the mfgr's tolerance, meaning they could allow 
10% low the day they ship it out. BP says it differently. On their 
latest spec sheets, they show a "warranted minimum" that is about 7% 
lower than the rated power.

That means that degradation is less of a component of the warranty.

 From what I've observed and heard from some others, for good quality 
crystalline/glass modules, 1/2% per year is reasonable to expect.

Windy

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