'if  you do 220  and not 238-242  

you will run 3 not 4'

I don't know how that makes sense. If the math is done correctly, it is 5400 watts on a (220V x 30A) 6600 watt circuit. 5400/6600 = 81%. If the rule is no more than 80% continuously, then this will work, yes? Can you please explain why I could only run 3 and not 4 on a 220V outlet?