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how to run a 2nd bat.
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<blockquote data-quote="helotaxi" data-source="post: 2439408" data-attributes="member: 550915"><p>It isn't nearly that simple. I could put the biggest alt made in my car and I would still get dimming. My factory alt is 165A but I still get dimming. The alt itself could theorectically react instantly but the voltage regulator has a voltage threshold that must be reached before it causes the alt to react. In some cases, the voltage regulator won't do anything unless the voltage dip is of a certain duration (measured in seconds in the case of my car) as it is part of the ECU and will up the engine idle RPM before upping the output of the alt.</p><p>A battery has a skin voltage that is higher than its nominal voltage, basically the same as the charging voltage. It will begin to contibute current as soon as the voltage begins to drop. Consider also that having a battery near the amps will also eliminate the voltage drop caused by the cable run from the front of the car to the rear and the gain from adding one should become more apparent.</p><p>The determining factor on whether or not you need a HO alt is the average current drain of the system. With most daily systems and music the average draw is actually really low (</p></blockquote><p></p>
[QUOTE="helotaxi, post: 2439408, member: 550915"] It isn't nearly that simple. I could put the biggest alt made in my car and I would still get dimming. My factory alt is 165A but I still get dimming. The alt itself could theorectically react instantly but the voltage regulator has a voltage threshold that must be reached before it causes the alt to react. In some cases, the voltage regulator won't do anything unless the voltage dip is of a certain duration (measured in seconds in the case of my car) as it is part of the ECU and will up the engine idle RPM before upping the output of the alt. A battery has a skin voltage that is higher than its nominal voltage, basically the same as the charging voltage. It will begin to contibute current as soon as the voltage begins to drop. Consider also that having a battery near the amps will also eliminate the voltage drop caused by the cable run from the front of the car to the rear and the gain from adding one should become more apparent. The determining factor on whether or not you need a HO alt is the average current drain of the system. With most daily systems and music the average draw is actually really low ( [/QUOTE]
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