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Message: <blockquote data-quote="jrwalte" data-source="post: 4448538" data-attributes="member: 584454">Amperage is determined by wattage divided by voltage. Using safe numbers, an alternator can easily maintain 13.8 volts. No amp is 100% efficient in power conversion, so to be safe you should also increase your amps rated RMS by 15%. This would give you an 85% efficient rating.  So if you had a 1500RMS amp, the amperage required (at peak) would be 125 amps. Don't forget to add 30-50 amps for your cars electrical.Even then, it's no big deal if you have to cut it close. That's what an extra battery is for.</blockquote>

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