You need a compact solar battery charger to charge your portable devices when off the grid or during an emergency sitiation. You can get the best out of any power situation with ease if you can couple a good solar charger with a goodUSB battery pack to hold the power for later use as well.

The best solar battery charger: Anker PowerPort Solar Lite (fast phone charging, slower tablet charging, compact and light, 15 W power)

The second best soalr battery charger: Poweradd 14W (High-Efficiency) Foldable Solar Charger (compact and lightweight two-panel array)