The Dutch design firm Springtime invented this ice cream cart. The solar cells on the roof collect enough energy to keep the ice cream chilled:
The ice cream carts were designed to have a solar panel attached to the roof, which charges the batteries in order to keep the ice nice and cold on a hot summer day. The design team hope that the innovative vending cart will result in a energy-neutral solution for ice cream vendors all around the world.
Link -via Gizmodo | Design Firm's Website
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There is a student run club at my school that has built and operates a Solar Powered Smoothie Cart. Using the energy gathered from the sun, they have enough power to operate two blenders which they use to make their smoothies, which are typically sold as a fundraiser. Here is a picture http://www.eng.buffalo.edu/esw/Smoothie.html
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Use something hot to keep something cold? It's heresy I tell you! But not as big a heresy as solar-powered lights.
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