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Message: <blockquote data-quote="yacob.naif" data-source="post: 1770377" data-attributes="member: 565696">i think it's more an issue of when you want both batteries to charge with the ignition on, which they are already doing now, but isolating your starter battery with the ignition off, so your accessories will only draw from the second battery.If you want a cheaper solution, you can get a low-voltage interrupt that will stop current from your starter battery to your system if the voltage drops to a set level.  They're much cheaper than a high-amperage isolator.Any kind of switch between your alternator, and your second battery/your system, is going to lose some power along the way, tho.  If you don't run your system with the car off, i would do without either.edit: beat me to it</blockquote>

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