The Venture 30 Solar USB Recharging Kit from Goal Zero lets you pack in power for your smartphone, GPS unit, camera or other USB device, and replenish the power off the grid with solar energy. The kit comes with the Venture 30 Portable Battery Pack, which stores power for charging devices, and the Nomad 7 Solar Panel, which can collect enough energy from sunlight to fully recharge the battery pack in 16 hours or less. The battery pack can also be recharged with AC or DC power via USB; this method will fully charge it in 5 hours.
The battery pack features integrated cables for phones and devices, so you don't have to worry about packing separate cords. It is rated IPX6 for water resistance, so rain won't do it any harm. Its 7800mAh, 3.6V battery can charge a tablet once, a smartphone up to three times, a GoPro camera five times and a headlamp as many as 10 times. Your devices will charge as quickly from the battery pack as they do when plugged into a wall outlet at home.
The solar panel will fully recharge the battery pack in 8-16 hours. It puts out 7W of power, and you can chain multiple Nomad units together to increase wattage output for added versatility. You can use it to recharge the battery pack, or plug smaller USB devices directly into it for a recharge straight from the sun.