After rise it won't pull near that much. I run a 25a power supply on a HU and a small class A/B 4 channel amp
Once you get much past that you'd be better off to buy an amp designed for 120v. A power supply for that isn't going to be cheap
I see it'll be a slash 300/4 running prolly 50 rms a channel and a alpine mrp500 I believe running 4 ohms on the mono around 150 watts rms I'll look into a 120 volt amps