Quote Originally Posted by lakeside
Well that caught my eye, Mostly I would spend more than $500 on a rotary where as the one I found for $268 would mostly meet my present needs How many real amps should the invertor kick out?Is there any advange of getting one with more amps so it could be switch between machines?
you could do something like this ...puts out 24 amps(7.5hp rated) and probably won't go over $150 used.

I personally like to use 1 vfd per machine due to programing. I currently have 1/2hp, 1hp, 2hp, and a 7.5hp VFDs under my desk right now waiting to get finished into projects. I have around $250-300 in the set. the 3 small ones(combined) take up the space of a sheet of paper and the 7.5 is about a sheet and 1/2 by itself(older unit).