Time to do a little reading and figure out what the fuck is what in terms of watts, volts,and amps. This should take you like 10 minutes.
Breakers are sized by the gauge of the wire and NOTHING ELSE!
Yes, you can run 4k with a 150 amp service. Hell, you could safely run 24,000 watts with 150.
But if your running 4 then it makes sense to go 240v current.
For the obvious reasons that you will discover when you start reading.