Roll up Solar Panels. 2 x 68 W Solar Panels These are what I use for portability on the move: Deployed on a BOV: The Solar Panels I've mounted on top of a Land Rover Defender 110. 2 x 68 Watt flexi-panels joined up in parallel, then going to a charge controller, finally going to the Trojan Battery. This is a great way of getting your transport off the grid and producing it's own power FREE! The panels will last decades and then some and the battery is good for years! Get the roof bars on, make sure you've got some roof glands for getting the cables through. Seal it all up, connect all the wires and you're done!