Does any one know of a portable solar power solution that can both triple charge a car battery and be used to charge electronics. Most solar power solutions I have found only have a USB or other power cable running from the solar panel. I don't want some thing mounted to my 4runner as I also like to raft and would like to be able to take it with me but if my car battery dies I want to be able to trickle charge it when I get off the river. Any Ideas?