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<blockquote data-quote="Thnking" data-source="post: 2439970" data-attributes="member: 571105">Don’t get me wrong, my explanation isn’t simple.Reaction rate is going to be the equivalent from alternator to alternator, it’s limited by mechanical means and is much faster (a few ms to 10ms) than we can perceive.&nbsp; Voltage regulators adjust the field cycle typically 2-3x as fast as this, this is how they are set.&nbsp; That’s pretty standard, for electromagnetic regulators.&nbsp; PWM regulators typical duty cycles are around 5-10x that.In your car it sounds like the voltage regulator is part of the engine computer controller, pretty common.&nbsp; In your case it’s not the alternator’s or voltage regulator’s lack of reaction time, it’s the fact that at idle the load can’t be supported by the field adjustment or resistance adjustment of the voltage regulator.&nbsp; So after a set point amount of time the computer increases idle.&nbsp; A very different issue.As the term implies, “surface charge” has very little relationship with chemical vs electrode reaction in a battery.&nbsp; So while a battery may exhibit a higher than normal voltage due to the surface charge, current discharge is very low for the surface charge potential.And yes a battery will eliminate the extra wire Vdrop by having it in the rear, which is only going to significantly discharge below 12V, probably closer to 11V.&nbsp; And the Vdrop should be very low to begin with, because the wire should be sized properly.</blockquote>

[QUOTE="Thnking, post: 2439970, member: 571105"] Don’t get me wrong, my explanation isn’t simple. Reaction rate is going to be the equivalent from alternator to alternator, it’s limited by mechanical means and is much faster (a few ms to 10ms) than we can perceive. Voltage regulators adjust the field cycle typically 2-3x as fast as this, this is how they are set. That’s pretty standard, for electromagnetic regulators. PWM regulators typical duty cycles are around 5-10x that. In your car it sounds like the voltage regulator is part of the engine computer controller, pretty common. In your case it’s not the alternator’s or voltage regulator’s lack of reaction time, it’s the fact that at idle the load can’t be supported by the field adjustment or resistance adjustment of the voltage regulator. So after a set point amount of time the computer increases idle. A very different issue. As the term implies, “surface charge” has very little relationship with chemical vs electrode reaction in a battery. So while a battery may exhibit a higher than normal voltage due to the surface charge, current discharge is very low for the surface charge potential. And yes a battery will eliminate the extra wire Vdrop by having it in the rear, which is only going to significantly discharge below 12V, probably closer to 11V. And the Vdrop should be very low to begin with, because the wire should be sized properly. [/QUOTE]

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