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Solar Panels That Work at Night: The Next Big Leap in Renewable Energy - discoverwildscience
(discoverwildscience.com)
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Yes 50 milliwatts is what googling says you can get from tegs. And the delta T giving 50 milliwatts drops to 0 in an hour after the panel cools to ambient at night.
That's why the article is such bullshit. A basic understanding of heat can prove there's not significant energy that can be harvested from a slab of glass going from 30C to 0C even at 100% efficiency.
Without even doing the math I'm screaming, "How long do they think solar panels take to cool down?!" Hell, they start cooling long before actual sundown.
SOURCE: I'm outside at sundown nearly every day.