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<blockquote data-quote="keep_hope_alive" data-source="post: 7853341" data-attributes="member: 576029">the equation you want is called Ohm&#039;s Law.&nbsp; my sig has the equation.to figure out current drawn at a given amplifier power output you need to know the amplifiers efficiency at that power level.&nbsp;&nbsp; You also need to know battery voltage (which varies car on/off and changes with voltage drop from load)Wattage (output) / Efficiency (%) = Power input.Current drawn = Power input / Battery voltageIf 80% efficient.1000/.8 = 1250 Watt consumedif 13.5VDC1250/13.5 = 92.6 A DCbut that current would only be for an instant with music.&nbsp; Average music power is MUCH less than Peak music power (the difference is referred to as Crest Factor in dB).simply put - a good front battery is important to maintain &amp;gt;12.6 VDC.a high output alternator is required to maintain &amp;gt;14 VDCsize of the alternator depends on the load and habits.I recommend you have a volt meter installed in the dash so you can monitor battery voltage. if it ever drops below 12.3 VDC you should turn the volume down and let the batteries recharge.</blockquote>

[QUOTE="keep_hope_alive, post: 7853341, member: 576029"] the equation you want is called Ohm's Law. my sig has the equation. to figure out current drawn at a given amplifier power output you need to know the amplifiers efficiency at that power level. You also need to know battery voltage (which varies car on/off and changes with voltage drop from load) Wattage (output) / Efficiency (%) = Power input. Current drawn = Power input / Battery voltage If 80% efficient. 1000/.8 = 1250 Watt consumed if 13.5VDC 1250/13.5 = 92.6 A DC but that current would only be for an instant with music. Average music power is MUCH less than Peak music power (the difference is referred to as Crest Factor in dB). simply put - a good front battery is important to maintain >12.6 VDC. a high output alternator is required to maintain >14 VDC size of the alternator depends on the load and habits. I recommend you have a volt meter installed in the dash so you can monitor battery voltage. if it ever drops below 12.3 VDC you should turn the volume down and let the batteries recharge. [/QUOTE]

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