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this post was submitted on 30 Sep 2023
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A team at NREL found evidence for the cause of this a couple years ago. It's something to do with interaction between the boron and the oxygen content within the silicon cells. If it holds up, hopefully we're on the road lessening the degradation over time.
Some panels are around 90% at 40 years now, and there isn't really much of a price premium for those panels either.