I have a 2,400 watt Rockford Fosgate amp and was wondering what kind of capacitor should I get? How many farads should it have minimum? Any help would be appreciated.
well, if you are going to get a cap, i'd recommend a 5 farad cap for that application, you usually want to go 500 watts per farad. a better option than getting a cap would be to get a high CCA battery like an optima yellow-top and some new higher Gauge wiring for your alternator and battery. all a cap does, is stiffen voltage rails, that is why it is called a "stiffening" capacitator. you will only give yourself 5-10 amps of current extra with a cap, and a higher CCA battery will do a lot more for you, and they can also be run to empty and are still rechargable.
well if you have an amp that is really putting out that amount of power, yes, i would recommend an alternator upgrade. 200 amp alternator would be best, but you could get by with 160-180 amps. any upgrade would be better than what you already have obviously.