Tropicana: Billboard powered by oranges

We created a billboard that harnesses the energy from oranges to illuminate a neon sign that reads “Natural Energy” & the Tropicana logo. Through several thousand spikes of copper and zink, a lot of wiring and 3 months of testing we managed to make a giant multi-cell battery powerful enough to light up a billboard. [...]

Source: http://www.ibelieveinadv.com/2011/04/tropicana-billboard-powered-by-oranges/

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