This works great on the boat. It self recharges and opens up more ports. Don't know how it will work with the 1 watt Alpha though. It may drain the batteries quickly. On the other hand, when you are offline it will recharge from the USB port.

http://www.amazon.com/CyberPower-CP-H420MP-4-Port-USB-Hub/dp/B0002UQALQ