In article , firstname.lastname@example.org says... | To accomplish this, I am thinking about powering the computers directly with | 12 volts DC current. This means that I have to have some kind of central | unit that will take 120 AC power and convert the energy to 12 volt DC and | feed all the computers from there (150 feet max cable runs). I calculated | that the total energy requirement per computer is 30 watts tops (12V - 2.5 | amp) | | I am thinking of using 600 watts power supplies such as | |
Your scheme is doomed to complete and utter failure. Those PSU's are certainly NOT capable of delivering 50amps at 12v each. You will also likely need -12v, -5v and another quite high current supply at 5v. Other control signals are also needed between the PC's and PSU's, before they will operate.
The main problem is voltage drop at such low voltages and high currents, unless you use large copper bus bars, will be absolutely horrendous. Computers need a tightly regulated PSU. Any spikes, surges and voltage drop will cause them to crash. If you doubt this, try running just one PC from its original PSU, with just 20 foot of cable linking the two.
If were going to do this (if I had to do this), I would be thinking along the lines of distributing 25v and -25v to each computer, then locally regulating it down to the required voltages using series regulators at each PC. These types of regulators generate lots of waste heat and are usually no more than around 50% efficient.