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<blockquote data-quote="Brian Owens" data-source="post: 1214823" data-attributes="member: 548450">The short/simple version:Caps do not make energy, they only store it.&nbsp; If you used a cap only without the car running, the cap would quickly discharge, and the system would shut off.An isolator is for a multiple battery system.&nbsp; It &quot;isolates&quot; the additional battery from the rest of the car&#039;s electrical system while still allowing the the car&#039;s alternator to charge it (like a diode or a one-way valve).&nbsp; So, you have you stock battery up front under the hood, and a couple of deep cycle batteries in the back.&nbsp; You connect these deep cycle batteries to your car through an isolator.&nbsp; You then connect your stereo to the deep cycle batteries.&nbsp; You wash your car listening to the radio and the deep cycle batteries get low.&nbsp; The isolator prevented the car&#039;s starting battery from going down (the radio was only running on the deep cycle batteries), so you can still start your car.&nbsp; When you start the car, the deep cycle batteries begin to charge back up.&nbsp; Since they are deep cycle batteries, it does not hurt them to run them down like it does a standard battery.&nbsp; When they are charged back up, you can shut the car off and start the process over.Brian</blockquote>

[QUOTE="Brian Owens, post: 1214823, member: 548450"] The short/simple version: Caps do not make energy, they only store it. If you used a cap only without the car running, the cap would quickly discharge, and the system would shut off. An isolator is for a multiple battery system. It "isolates" the additional battery from the rest of the car's electrical system while still allowing the the car's alternator to charge it (like a diode or a one-way valve). So, you have you stock battery up front under the hood, and a couple of deep cycle batteries in the back. You connect these deep cycle batteries to your car through an isolator. You then connect your stereo to the deep cycle batteries. You wash your car listening to the radio and the deep cycle batteries get low. The isolator prevented the car's starting battery from going down (the radio was only running on the deep cycle batteries), so you can still start your car. When you start the car, the deep cycle batteries begin to charge back up. Since they are deep cycle batteries, it does not hurt them to run them down like it does a standard battery. When they are charged back up, you can shut the car off and start the process over. Brian [/QUOTE]

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