>>619057I picked up a solar panel that comes in a briefcase, similar to the one in the picture, I got it for $35 used (but like new) from craigslist, I use it to charge up my deep cycle battery when I'm not using it to charge my laptop, having it propped up next to the van or inside the windshield isn't the most stealthy of things but it does work well, and it will recharge my laptop in a pretty short time on sunny days.
