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<blockquote data-quote="n2audio" data-source="post: 6795144" data-attributes="member: 540940">Not a lot of power at all by today&#039;s standards.&nbsp; Don&#039;t bother with a cap.At full volume with the engine off you&#039;re looking at a rough estimate of 23A of average current draw.A quality starting battery should have a reserve capacity of around 100 min at 25A, some are closer to 150 min.However, at the end of that time your battery would be near, possibly below 11v which 1) may or may not continue to operate your amps, and 2) may not be enough to crank the engine.I would say with your unmodified electrical system you should get at least an hour of parking lot time at high volume.&nbsp; If it&#039;s not cranked - 1.5-2 hrs.The 2nd battery would be a nice bit of insurance.With the engine running you should be able to crank it indefinitely w/o any significant effect on the electrical system (unless you&#039;re driving with an unusually small electrical system).</blockquote>

[QUOTE="n2audio, post: 6795144, member: 540940"] Not a lot of power at all by today's standards. Don't bother with a cap. At full volume with the engine off you're looking at a rough estimate of 23A of average current draw. A quality starting battery should have a reserve capacity of around 100 min at 25A, some are closer to 150 min. However, at the end of that time your battery would be near, possibly below 11v which 1) may or may not continue to operate your amps, and 2) may not be enough to crank the engine. I would say with your unmodified electrical system you should get at least an hour of parking lot time at high volume. If it's not cranked - 1.5-2 hrs. The 2nd battery would be a nice bit of insurance. With the engine running you should be able to crank it indefinitely w/o any significant effect on the electrical system (unless you're driving with an unusually small electrical system). [/QUOTE]

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