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<blockquote data-quote="SounDrive" data-source="post: 8128467" data-attributes="member: 653833">A good battery can NOT charge anywhere near as fast as an ultracap; the resistance is too high. Like I said, an ultracap&#039;s resistance approaches zero - so charging is near instantaneous and voltage drop is nonexistant. Also there&#039;s still the voltage drop to 12-13v that accompanies a battery (once again due to the resistance of the battery and inability to hold a charge much higher than it&#039;s voltage rating) - ultracaps hold the alternator&#039;s charging voltage.I believe there was some testing done that showed a single bank of ultracaps supporting a 500a current for 5 seconds before dropping to the voltage you&#039;d expect to see from a high quality battery. If I find the thread I&#039;ll link it for you. Note that a continuous 500a draw is NOT going to happen on music in 99.9% of setups. If so, you could just add more banks, anyway.EDIT: that test was also done with no alternator/charging system supporting the ultracaps</blockquote>

[QUOTE="SounDrive, post: 8128467, member: 653833"] A good battery can NOT charge anywhere near as fast as an ultracap; the resistance is too high. Like I said, an ultracap's resistance approaches zero - so charging is near instantaneous and voltage drop is nonexistant. Also there's still the voltage drop to 12-13v that accompanies a battery (once again due to the resistance of the battery and inability to hold a charge much higher than it's voltage rating) - ultracaps hold the alternator's charging voltage. I believe there was some testing done that showed a single bank of ultracaps supporting a 500a current for 5 seconds before dropping to the voltage you'd expect to see from a high quality battery. If I find the thread I'll link it for you. Note that a continuous 500a draw is NOT going to happen on music in 99.9% of setups. If so, you could just add more banks, anyway. EDIT: that test was also done with no alternator/charging system supporting the ultracaps [/QUOTE]

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