The Nomad 13.5M collect 13.5 watts of power from the sun, and stores power with the Sherpa 50 power pack for use anytime. The solar panel charges the Sherpa 50 power pack in 6-10 hours from the sun, giving you the power you need to use your smartphone, GPS, portable media player, or any other device you carry. On the mountain or at the beach, the Nomad 13.5M goes wherever you do.