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Solar charges meant to juice up your battery powered gadgets, like the Solio, have been on the market for years. Turns out Knut has some connections at the Institute for Energy Technology or IFE (very convenient contacts!) where he was able to procure some flexible solar cells.
This may be a slight hiccup in materials for a quick DIY home project but never the less flexible solar cells, or Photo Voltaics, are on the market in all sorts of shapes, sizes, and prices. See the full article and more pictures below: