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Message: <blockquote data-quote="smoka" data-source="post: 5864371" data-attributes="member: 606721">Some details would be nice.How many watts is that amp putting out?If you are using more power than the alt can generate, then all the extra batts are going to do is buy you more time until the voltage drop.Lets pretend your alt is running maxed out at a constant 250a. That means at 14v it can produce 3500w of power, at 12v it drops to 3000w of power.At an estimated 75% efficiency, that means if your amp is wired to output more than 2250w, then you are using more power than you can produce which means its only a matter of time before you drain your batts and fall under 12v.Now those are just general numbers to give you an idea whats going on. But since music is dynamic you will not be maxing out your amp power which means that batts might get to charge but not much.</blockquote>

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