0.8 megawatts 600 Volts equals how many amps?

800 000 Watts / 600 Volts = 1333.3333333 Amps.

With large current draws everything is going to need to be bigger, not just your amps. The law of diminishing returns starts to kick in and your mega-watt system may cost you four times as much while only delivering 6 decibels more output as compared to a more modest system. So the question is how much power do you need.