Looking for some help with an electronic project, not for my home but hopefully someone come help any way.
I'm planning on going on a 7-10 day cycle tour and am looking for a way to keep my phone and GoPro cameras charged. The closest product I've found is this: http://www.trademe.co.nz/electronics-photography/other-electronics/other/auction-577709926.htm
However the battery in it is pretty small (most AA batteries have close to the same charge), and has a very small solar panel, just 4 watts. I figured I could probably make something that would suit pretty easy?
I'm getting one of these to carry all my stuff:
Figured I could chuck the solar panel on the rack, and the rest inside with all my gear. Keeping the weight down is the main priority. I don't really know a lot about solar power, but from what I know, I'll need a solar panel (~10-20 watts?), a solar regulator/charger, small rechargeable 12v battery, and something to drop the voltage down to 5v, and feed it into a USB port.
If anyone can help me with what parts to use for this, or if you know a better solution I would love your help.