maylar
10+ year member
Electrical Weenie
The power supply's voltage regulator will shut down if it senses a voltage higher than what it's set for, even by a few millivolts. To prevent that you need to isolate them from each other with a diode, which passes current in only one direction. At the currents we're talking about (20 amps +) that would require a power diode, or rectifier. Digikey has them: (put rectifier in the search box)EFFF I'm guessing you can't just parallel them. I have 2 matching 950w power supplies but they shut off if I try to parallel them and run a single amp one them. What his this power diode or shottkey you speak of?
Digi-Key
Unfortunately, you'll lose 3/4 of a volt or more due to the voltage drop of the diode. If the PS is adjustable you can compensate for that by cranking the output up a bit. If not, you'll have to suffer with it. A Schottkey diode is a special type used in low voltage switching power supplies that has about half the forward voltage drop of a standard diode.