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<blockquote data-quote="helotaxi" data-source="post: 2272563" data-attributes="member: 550915">I&#039;m assuming that you&#039;re referring to the capacitance of the battery acting to filter out the ripple voltage from the alt?As far as an alt providing 500A, no normal system draws that kind of current.&nbsp; For a pure comp system, the alt becomes largely irrelevant during the burp as the battery bank becomes the primary current supply.For a realisitc daily system, the alt SHOULD be the primary source of current and the battery there to back up the alt when the demand exceeds what the alt is currently putting out.&nbsp; The maximum capacity of the alt doesn&#039;t need to be exceeded for the battery to play a part.&nbsp; As hinted at above the battery will react faster to transient demands than the alt and the battery can act as a buffer to soften a transient voltage drop until the alt catches up.For a daily system, a single good battery should provide more than enough reserve capacity.&nbsp; Adding a second battery shouldn&#039;t be necessary, as the alt should be the source of power for the car.&nbsp; Remember that the alt has to replace any energy drawn from the battery eventually so regularly exceeding the alt&#039;s capacity and relying on the battery to pick up the slack is a sure recipe to kill the battery and bun up the alt.&nbsp; Adding more batteries won&#039;t help this situation either as it doesn&#039;t diminish the amount of power that the alt has to replace and it also can make the siuaition worse because multiple batteries wired in parallel will draw more current while recharging than a single battery.The real bottom line is that it isn&#039;t possible to to simply say that if you have X amount of amp power and the alt is rated for Y then you need to add Z to the car to make sure that you don&#039;t have any electrical problems simply because every system, every car and every user is different and what works for one may not work at all for another.</blockquote>

[QUOTE="helotaxi, post: 2272563, member: 550915"] I'm assuming that you're referring to the capacitance of the battery acting to filter out the ripple voltage from the alt? As far as an alt providing 500A, no normal system draws that kind of current. For a pure comp system, the alt becomes largely irrelevant during the burp as the battery bank becomes the primary current supply. For a realisitc daily system, the alt SHOULD be the primary source of current and the battery there to back up the alt when the demand exceeds what the alt is currently putting out. The maximum capacity of the alt doesn't need to be exceeded for the battery to play a part. As hinted at above the battery will react faster to transient demands than the alt and the battery can act as a buffer to soften a transient voltage drop until the alt catches up. For a daily system, a single good battery should provide more than enough reserve capacity. Adding a second battery shouldn't be necessary, as the alt should be the source of power for the car. Remember that the alt has to replace any energy drawn from the battery eventually so regularly exceeding the alt's capacity and relying on the battery to pick up the slack is a sure recipe to kill the battery and bun up the alt. Adding more batteries won't help this situation either as it doesn't diminish the amount of power that the alt has to replace and it also can make the siuaition worse because multiple batteries wired in parallel will draw more current while recharging than a single battery. The real bottom line is that it isn't possible to to simply say that if you have X amount of amp power and the alt is rated for Y then you need to add Z to the car to make sure that you don't have any electrical problems simply because every system, every car and every user is different and what works for one may not work at all for another. [/QUOTE]

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