Thread: cap math?
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Old 07-21-2006, 07:28 AM   #8
Shadow
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Join Date: Jul 2001
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First, it's an alternator not altinator. Second, you've got room under the hood for a second battery. Third, as long as you never sit with your car off and play the system, your factory alternator could handle the secondary battery no problem. I had a 100A GM Smallcase alt that handled a normal lead acid and two 1100CCA batteries just fine. Fourth, if you want to isolate the batteries, that's cool, but high amperage isolators cost a LOT of money. I'd just parallel them.

Red top = cranking battery
yellow top = battery for system

The yellow top is made to be deep cycled. With your alternator constantly charging it you'll see less benefit out of it. The red top is meant to be topped off most of the time.
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