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<blockquote data-quote="violator5spd" data-source="post: 144703" data-attributes="member: 545373"><p>usually you can use these formulas for amp draw and it's fairly accurate...</p><p></p><p>for class D amps -</p><p></p><p>RMS watts / 14.4 / .80 , the 14.4 is for volts and the class D amps are generally 80% efficient...</p><p></p><p>for class AB amps -</p><p></p><p>RMS watts / 14.4 / .60 , same stuff but they're more like 60% efficient...</p><p></p><p>1000 / 14.4 / .80 = about 90 amps</p><p></p><p>680 / 14.4 / .60 = about 80 amps</p><p></p><p>so unless i'm wrong, those to amps will draw around 170a max, leaving 30a for your car. i think you would be fine with a 200a alternator...</p></blockquote><p></p>
[QUOTE="violator5spd, post: 144703, member: 545373"] usually you can use these formulas for amp draw and it's fairly accurate... for class D amps - RMS watts / 14.4 / .80 , the 14.4 is for volts and the class D amps are generally 80% efficient... for class AB amps - RMS watts / 14.4 / .60 , same stuff but they're more like 60% efficient... 1000 / 14.4 / .80 = about 90 amps 680 / 14.4 / .60 = about 80 amps so unless i'm wrong, those to amps will draw around 170a max, leaving 30a for your car. i think you would be fine with a 200a alternator... [/QUOTE]
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