Hello Tacoistas, As you know, we recently made a group purchase of 24 volts@25 amps switching power supplies. I have only 2 units left, at $40 a piece. In parallel, they will deliver 24 volts at 50 amps, and in series, 48 volts at 25 amps, or 1.2 kilowatts They have a built-in fan, are short circuit proof, etc. Anyone interested, please let me know. 73 Andre'