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<blockquote data-quote="VWBobby" data-source="post: 8198467" data-attributes="member: 624844"><p>Depends on your voltage drop at the amp. The only way to tell is to run your amp at full tilt and measure the voltage on the power leads. If the voltage is dipping below 12.5V - 13V, you need more reserve power (batteries, alt, or both). A lot of guys go overkill for lack of understanding of current draw and voltage. Voltage = potential. Amperage = flow.</p><p></p><p>You can calculate your current requirements from your amp's current draw.</p><p></p><p>EXAMPLE: Just because your amp can draw ~400A at full tilt does not mean you need a 400A alternator(s). The average current draw will be somewhere around 200A, except on test tones.</p><p></p><p>Personally, I would rather run 1 large alternator and 2- 3 batteries.</p></blockquote><p></p>
[QUOTE="VWBobby, post: 8198467, member: 624844"] Depends on your voltage drop at the amp. The only way to tell is to run your amp at full tilt and measure the voltage on the power leads. If the voltage is dipping below 12.5V - 13V, you need more reserve power (batteries, alt, or both). A lot of guys go overkill for lack of understanding of current draw and voltage. Voltage = potential. Amperage = flow. You can calculate your current requirements from your amp's current draw. EXAMPLE: Just because your amp can draw ~400A at full tilt does not mean you need a 400A alternator(s). The average current draw will be somewhere around 200A, except on test tones. Personally, I would rather run 1 large alternator and 2- 3 batteries. [/QUOTE]
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