Hey OP
ussually . you should run 50Hz devices on 60Hz ( I personally ren at 400Hz ! and the power factor was increased by few digits ! ) , the problem is that you got 60Hz stuff , in that case you only gonna lower the efficiency of the device ..
playing with mains is not A game hence I won't tell you what just went into my mind
that "5000" device firstly pop the " chinese " and then ... well I don't gonna trust these figures due to my bad experience with them , they simply are piss of junk witch should be thrown to the occian ...
this 5000 figure may be reveal as 1 third of that ... in that case .. you where screwed ...
please read the comments below , as you may find out , at 140$ ... my brain has some great difficulties figure out how *true* 5KW device can be sold ..
Plus , I didn't saw any frequency conversion spec in that listing . If you did . please forgive me . if you didn't ... watch out for these things ...
My 2 Cent ..