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Oh the dichotomy; you'd have to put your fermenter in the sun so that it could cool
However a keg at a party with solar power to keep cool is a great idea.
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Boffins chill out with solar-powered beer bottles
The best invention ever ... probably
Robert Jaques, vnunet.com 12 Jul 2006
Beer bottles that use solar power to keep their precious contents cool in the height of summer could be a welcome fringe benefit of thin-film technology currently under development.
The material being developed by researchers at the US Rensselaer Polytechnic Institute sticks solar cells and heat pumps onto surfaces, and could ultimately turn walls, windows and even beer bottles into climate control systems.
Oh the dichotomy; you'd have to put your fermenter in the sun so that it could cool
However a keg at a party with solar power to keep cool is a great idea.
Doc