Do solar panels depreciate like cars do? Are we able to find great deals on used solar panels?
by 
Egao No Genki
ANSWERS: 4
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they do very slowly. a 21 watt solar panel that's been operating for 25 years would probably lose about 2 watts. so its output would diminish slower than it's used cost. i myself am trying to find deal. try craigslist.
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Used panel is just as the same as new one. The reason is because of silicon price.
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If they do, Egao, we might not want to buy them, as they may be inefficient!
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If you buy an "encapsulated" solar panel, there is a chemical reaction of the "silicon rubber" and the silicon cells. It eats them away till there is no more output from them. I learned that more than once the hard way. So anyone that is aware of this, will definately say they depreciate.
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