So I have read that our alternator is 105 amps, and an alternator ideally runs at 14.4 volts.. So theoretically, since watts = amps X volts, the stock electrical system should be able to handle a 1512 watt load. Since 13.5 volts is a more realistic number for the alternator to produce, that would still mean the electrical system could handle a 1417.5 watt load.. Even at 12 volts, we're still producing 1260 watts. I'm not sure what kind of efficiency all this has, or how many watts it takes just to run other electrical equipment on the car.. But that's just what I have gathered so far.
For Example: currently, I have an alpine pdx f4 amp that tested at 464 watts rms for the component speakers, the OEM bazooka sub that is 100 watts rms, hid low beams and fog lights (35watts each) so that's another 70 watts. Added up, that's 634 watts.. How many more watts could I safely run on my audio system without putting an overload on the alternator? This isn't talked about much because there are just so many factors (ie, Efficiency, and other things like how many other electrical components are you using at the same time, like opening windows, sun roof, using the brake lights, interior lights, whatever else uses electricity.. Are you listening to the music at full volume, etc)
I'm just throwing this out there because I'm about to get rid of my bazooka sub and get new subs and amp (500w rms amp for the subs + 464w rms for component speakers, so with my headlights on and music turned up, that's 1034 watts right there) and I want to learn more about this subject!