PowerBy betterways in CircuitsGadgets1,56422FavoriteEasy Solar Charger and PSU [UPDATED]by andrea biffi in SolarHeliostat for Solar Heatingby zawy in SolarHow to Build Cheap VHS Tape WINDBELT Generatorby Mladen_solar in EnergyA Paper Plate and Pop Bottle Savonius Wind Turbineby egbertfitzwilly in ScienceHow to Make a Cheap USB Powered Fanby Murf in USBVoltage Regulated [5v] Bicycle Dynamo Light & USB Chargerby sgomes3 in BikesHand Crank LED Flashlight Hacked - Now Also USB Chargerby pashanoid in EnergyHelical Vawt (blades and Charge Controller)by petercd in Energy