This is a great question. Brandon hits a major point here that given equal loading there would not be more parasitic loss. However, with a higher output unit, you have the potential to generate more power, thus you also have the potential to have greater parasitic loss. To keep this discussion as basic as possible, when broaching electromechanical issue such as this you always have to remember that there is no "free lunch." In any given system if you take out more, you have to put in more. This principle holds true for everything except robbing banks.
My brain has sghut off for this evening so I can't come up with anything better than what I wrote. Professionally, I usually tip my hat to the electronics folks in the nerdery with their calculators for such issues as I am generally not the best source for such things. :biggrin: