Works perfectly sunny day. Full charge of the battery in 4/5 hours. Used to recharge almost everything. During the trek to Morocco two weeks, it allowed me to recharge GPS, mobile phone, Ipod and even charge the batteries for my Nikon D700! Surprising. However, overcast, cloudy, it takes 20 hours to charge completely. Works equally well in hot weather (+ 45 ° C) or cold (-15 ° C). All fixed perfectly on a bag back. Warning! after charging, the battery does not keep charging more than three days. I suggest to recharge your devices fully charge the battery.
