For those asking about power. 
here is the power supply that is used in the photo's and is a fairly standard industrial power supply 30 Amp will drive 5
in either mode. and be safe. if you are going to stay in scrypt mode exclusively .5 amps per unit can safely run more
than probably be secured without connection issues. (could in theory connect 60 although I always allow 10% on continuous rating)

http://www.amazon.com/Universal-Regulated-Switching-Computer-Project/dp/B00D7CWSCG/ref=sr_1_1?ie=UTF8&qid=1392141141&sr=8-1&keywords=power+supply+12v+30amp

This power supply will allow you to run 15 at full power.  (slightly more actually)

http://www.amazon.com/Meanwell-Switching-Power-Constant-Ledwholesalers/dp/B007K4XZPG/ref=pd_rhf_dp_s_cp_5_YDA1?ie=UTF8&refRID=0EKYF1P7NQRC16GCXEE6

Would be interesting to see the power draw on the new firmware to allow for calcultions on a power supply:) although the 30 amp one would
be a very safe range if staying on scrypt, I don't see it going above 12 watts per unit. at that you could drive 27 without issue.

BTW a fairly standard laptop power supply would drive one of these. 

El

The Guy that works on the equipment that makes Computer Chips.  Wet/Diffusion/Epi/CMP