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re: "magnification is out."
21 apr 1999
marcus n hofer wrote:
>has anyone data on how high temperature decreases the lifetime of
>a pv cell? if you have for instance your unit running at 70 centigrade
>'permanently', does it shorten the lifetime of the panel by a factor of
>2 or just by a few months?
not a factor of 2, i'd guess, for moderate temperature increases, eg
20-70 c. metal migration matters, i guess, and stresses owing to thermal
cycling. other failure modes in ics have activation energies that become
more important at say, 100 c, but cells can also be designed to operate
more reliably at higher currents and temperatures. maybe richard komp or
bp or siemens can answer this question, for standard panels.
cells affected by corrosion and water vapor may last longer at higher
temperatures, which can also help overcome the stabler-wronski effect
in amorphous cells (a rapid initial efficiency deterioration.)
>i would think that this is the very most important parameter in the field
>of cogeneration of heat and electricity with pv panels.
sure...
nick
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