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Message: <blockquote data-quote="av83" data-source="post: 8164733" data-attributes="member: 640058">Think of it this way. Your vehicle will consume roughly 60% of the available amps. So.if your vehicle has a 100 amp alt(and you get a smaller amount of that at idle) that means you have roughly 40 amps to play with.You have a 1300 watt amp that, if you're lucky as heck, is 80% efficient. 1300 watts, and let's assume you can hold 13.5 volts(unlikely...) at 80% efficiency means you'll draw 120 amps at full tilt. You will need to cover what your vehicle needs(assuming 60 amps again, if the og alt was a 100 amp.unit)+ a minimum of 50% of the amp's maximum draw. And you want that at idle. So, a good alt for you will be 100 amps at idle. Alts generally are rated at rpm's that are higher than idle. I would suggest a 180 amp alt, minimum. You'll likely want to upgrade later on as well, so be sure to get yourself some growing room.</blockquote>

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