Okay, my understanding is that I have a pretty weak factory alternator in my 92 Supra Sunsport.

This summer I'll be adding a 4x100 watt alpine amp for the 4 speakers and another Rockford Fosgate Punch 360.2 amp that will be running 360 watts mono for a subwoofer.

So, taking that into consideration, I'll be using around 560 watts more than before at RMS. So at 12 volts, 560 watts = another 46 amperes of load on the system, right? (watts = amps * volts)

Eventually I'll probably add another amp and maybe some tower speakers (nothing too extreme, maybe some bazooka tubbies) and possibly some LED spotlights on the tower... But not this season.


So, what would be the ideal size of alternator for me to get? 140 amp? 180 amp? 200 amp?

I know that I need a marine alternator. I know that I have a left hand PCM351. I get really confused with this CW/CCW stuff and want to be sure I'm shopping for the right thing.

Would any of these work for me?
http://www.ebay.com/itm/ALTERNATOR-H...214c82&vxp=mtr

http://www.ebay.com/itm/HIGH-OUTPUT-...90b3cd&vxp=mtr

http://www.ebay.com/itm/HIGH-AMP-ALT...3c2f1a&vxp=mtr

I have heard people mention DB Electrical, but I'm not too keen on spending $300+ on a high amp alternator from them. I'd like to get as much bang for my buck as possible...

Thoughts?