What would you do with a watt of electricity at night? ⚡
Apr 05, 2022
“During the day, there's a light coming in from the Sun and hitting the solar cell, but during the night, something of a reverse happens,” Assawaworrarit says. “There’s actually light going out [from the solar panel], and we use that to generate electricity at night. The photons going out into the night sky actually cool down the solar cell,” he says.
“The theoretical limit is probably about one or two watts per square meter,” he says. “That’s not a huge number, but there are a lot of applications” where that kind of energy at night would come in handy. “It’s a sort of light,” Assawaworrarit says. The infrared radiation that glows from the warm Earth has wavelengths that are too long for eyes to see, but it does carry energy. In fact, more than half of the total amount of solar energy that hits the Earth goes through this process, eventually returning to space.
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