ORIGINAL: c/f
Eddie,
With castle creations BEC on their brushless electric speed controls they use two BEC in parrallel. They state this does not give them double the amperage load as one might think, but allows for a safety margin of thermal shutdown one then the other. Sounds really strange but you could get more info over in rcgroups electrics forums on this subject matter............
Actually that's because the two regulators won't share the load equally unless they are matched to within 0.1V or less - which is hard to do and even if you get it close, it changes with temperature. If they are not matched that closely, then the one with the higher output voltage will carry 90% of the load.
I've actually set up a system like this with two Duralite regulators and watched its operation. We did it on a NASA research model for redundancy.
Bob