Awesome setup , I run an HP C-3000 enclosure with 3 hp proliant bl460c gen6 ( i have a 4th ) and 1 bl480c ( i have 2 ) blades. Your setup is eh 50/50 blade maybe as it looks its standard ATX boards using standard ATX PSU's and I assume its 1 per machine using a propitiatory connector interface so you can slide out each blade and just slide it back in? Its more a VERY organized ATX setup and that means you can GPU crunch as blades such as mine have minimal video capabilities and is meant to be done remote. Additionally , my C-3000 has 6 x 1200w PSU and 6 super tubro fans ( 6 stacked ) and addon modules such as single or redundant Onboard Administrators to control the enclosure and manage it remotely along with HP iLO integrated lights out that is a hardware version of VNC with the ability to micro manage everything and lastly addon pass-threw ethernet and fiber optic modules and KVM and more. I have a C-7000 in storage with 16 BL460s I will upgrade to but as you mentioned your 15 amp limitation and that unit is 220v and my current 120v and I have to split it between 2 breakers/legs ( actually 3 right now due to my EMC CX4-120 SANS array ) I rewired the place a bit as the whole livingroom along with kitchen , hallway lights and the TV/media center uses the same 15amp leg. SOOOO the washer did not need its own 20amp and another 20amp was used for the other half of the livingroom and both 20 amp lines are dedicated to the blade enclosure setup with 1 PSU on the 15 amp for backup as the whole setup is typically 12-13amp. APC has inexpensive PDU's that are a power strip that shows the current draw threw it. Really awesome seeing it done with standard hardware , I knew someone had to make a case and interconnection interface for standard ATX hardware so its not really a " blade " its a standard low profile 1u machine sideways in an enclosure made to hold 8 machines per 6u of space?