Dubbed the Power Pad 16 (DS-IP-PP16), it provides enough power to charge 16 iPads at one time. iPads take more USB power than any other consumer USB-powered device.
Created by Datamation Systems, a security carts and cabinet company, it’s designed to be used in school common areas where lots of students need power simultaneously (like classrooms or even lunchrooms). It can also be integrated into a mobile cart to charge everything while in storage.
Here are the details: http://www.ipadcarts.com/solutions/DS-IP-PP16.htm