A few days ago i built a solar charger for usb gadget with some of parts from sparkfun and adafruit industries. Did you plan to make a kit with DC-DC converter, battery and solar charger ? It could be very interesting for all our electronics gadgets
Iām using sparkfun LiPoly Charger - Single Cell 3.7-7V Input to charge a lipo battery with a 6v solar panel. I convert 3.7v from the battery to 5v for usb output with a mintyboost MintyBoost Kit. It should be better if we have the lipo charger on mintyboost PCB.