I purchased a folding Goal Zero 7w dual solar panel with a gift card from Bass Pro..I'm not a back packer or camper so can't speak to its durability, but it is marketed as a piece of expedition quality equipment....I wanted a backup to my car charger for hurricane season, and as a former science teacher, a gizmo to fool around with...

in an effort to standardize my small batteries to AA .. (primarily my Grundig radio and LED mini mag lights) on the recommendation of AFLM purchased a set of Sanyo AA Eneloops and a microprocessor charger... on 120v AC, 4 partially charged Eneloops took about 2hrs to receive a full charge... using the solar panel and 12V cig plug the other 4 took a little less than 4 hours...

to orient the cells to the Sun, I fastened a nail as vertical as possible on a small piece of plywood, then elevated the board so the shadow of the nail fell on itself, orienting for the most direct rays

later purchased the companion Goal Zero Guide 10 power pack which works with included small 12v plug or USB to recharge the Eneloops, and has a small LED light, and a USB to mini USB cable out to charge my cell phone

as I commented on earlier in the Summer, don't have a ammeter to see the actual charge rate..