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Message: <blockquote data-quote="PaulD" data-source="post: 6262931" data-attributes="member: 589636">good grief, ESR is just the effective resistance in series with the "perfect device".  In theory, a cap has only capacitance - in reality it has a small amount of resistance, which we denote as ESR in this case.The problem is that even a small amount of resistance will make the cap useless in this appication.  With just a 100 amp draw and a 20 milliohm (.02 ohm) ESR, the voltage drop will be 2 volts  ....  V=IxR or voltage drop = 100A x .02.  The "power" stored in the cap has to do with the voltage level, since most amps will cut off around 10 volts sob you you really only have access to about 30% of it's stored charge anyway (14-10 / 10)</blockquote>

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