[Butcher]

You could use a 24V 200A supply if you could find one - the amount of current drawn depends on the voltage. Thus any power supply with at least 11.3A continuous output at 24V will do fine. More volts is not a good isdea though. Also note that peltiers are more efficient below their maximum voltage - as you approach and exceed maximum voltage you don't get much more cooling - the efficiency drops and the extra power is wasted (as heat off the hot side).