I carried a Brunton Solaris 4 this summer for almost 3 months before I replaced it for a battery pack simply because of the days getting shorter with less sun.
I found that for charging anything I had it was as good as plugging into a wall socket.
It all depends on what sort of battery you use for a camera though and how much power it has. It also depends on what your hiking style is like. Do you hike from sun up to sun down? I never did try to attach the panel to my pack and charge as I go. I would just get into camp and set it up normally with many hours of sunlight to work with.
I never did use it to charge a camera battery because I did not have a USB charger for either the NB-7L or the NB-10L that I used. Although if I had based on the Mah ratings of those batteries I could have kept them charged easy.
If you can use AA or AAA batteries for your camera and want a rechargable battery that can compete with Lithium batteries try Sanyo Eneloop.
Last edited by RoguePhotonic; 09/22/12 10:54 AM.
