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DIY Solar USB Charger - Altoids: 11 Steps (with Pictures)

DIY Solar USB Charger - Altoids: 11 Steps (with Pictures)
If we use two rechargeable AAs that put out a total of 2.4Vs we're going to need a solar panel that is at least 3 - 4Vs just to meet basic levels of charging. The higher the voltage of our solar cell (or cells) the less light we need to charge up our batteries. Now we're also trying to fit this into an Altoids Tin, so we're limited in space. I have found some great 4V solar cells that perfectly fit into Altoids Tins. They're the same ones I use with my Solar AA Altoids Charger. Sure, a bigger and better solar cell would give us added power, but it wouldn't fit into our tin. You could also use a combination of several smaller cells to get your four volts. Just remember that when charging NiMh batteries we don't want to throw more than 10% of their capacity at them at any one time.

http://www.instructables.com/id/Solar-Altoids-USB-Charger/

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