High Output Alternator and Stereo System?

200 amp x 14 volts = 2800 watts if everything was perfect, but when you figure in efficiency loss from amps and running power for the car, you should really count on about 2300-2400 watts RMS. you can add a second battery with some extra fusing and a high amp relay to isolate them when the car is off, and it will help some too. hope that helps.