I think they're referring to the white plastic covering the back side of the panel for electrical insulation. No idea why it's white, since making the back side black would help to radiate heat. (I'm going to guess the specific kind of plastic used is white and the pigments used to change the color have undesirable effects in that application.)
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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