Originally Posted by
cntrylvr79
A deep cycle battery isn't going to help with dimming lights. All they're good for is allowing you to run a system longer with the engine off than a regular battery. They also can be run down further than a standard battery while still recovering. Whereas the first time you run a stanrdard battery down enough it never truly recovers. THe other problem with deep cycle batteries is for a given size they tend to have much lower cold cranking amps than a stardard battery. Now if you don't live in a place where it gets very cold you can genreally skate by this problem.
I do have one problem with your statement though. The math doesn't add up. FActory spec on a galants alternator is 85-100 amps. Even if your alternator is outputting 15 volts, that's 167 amps of current required to hit 2500 watts. And that's if the amps were 100% efficient. That's a minimum of 60amps worth of power that the battery has to provide, not including the 50+ that the car's electrical system pulls to run it.