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Just a comment on the cheaper PVs available today, like Kaneka (did I spell that right?). They aren't UL approved as far as I know, so they aren't eligible for installations in grid tie systems or for tax rebates etc in most places. Also, compared to when I bought my first PV panels back in 1982, today's PVs are dirt cheap. I think that they were about $10 a watt, and a dollar was worth a lot more than it is today. And they still work fine, and show no signs of deterioration.
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