How to supply A2B Phantom power - help!

I'm developing a prototype of an A2B system using some phantom powered A2B device (slave) boards that we already developed for another project. For the new system I need 8 phantom powered devices and they draw too much power in total.  The current system uses 4 of them and meets the phantom power limits of A2B.  How can I use 8 of these in my prototype? (the actual system will have different boards in it and this won't be an issue).