Just a quick FYI on the Brunton roll ups. Unless you are using a vehicle, I wouldn't use them, they dont roll up that small. We took some to Afghanistan, and while the small ones were great for strapping across your ruck to work while you walk, storing them was a bit of a pain. The one I do like is the tri-fold 25 watt system they have, it's a bit bulky, about the size of a small laptop, but what a powerhouse! I'm not sure if they even make them any more, but it was tough, and provided a lot of juice in a short time. Because it folds into it's own case, it was pretty rugged too.

Cheers,
Mike