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Message: <blockquote data-quote="hispls" data-source="post: 8752035" data-attributes="member: 614752">Probably depends on the alternator and the regulator but definitely NOT instantaneous like the battery will try to do and consider whatever the alt is rated is cold, on a test bench, and at optimum RPM, real world performance may vary.By the numbers 6 minutes if the bank is 80AH.   Of course amp hours are probably NOT rated at 10C and your voltage will sag as you discharge and sag faster the harder you're pulling.   And running it at 10C regularly will dump your cycle life to probably 1000 or so as opposed to 24,000.    Cycle life going down to C rate going up is NOT linear relationship.Then again, it may be with your box and music listening you're rarely drawing more than 400A and you're in much better shape with very infrequent 10C peaks.    You really won't know for sure how well it holds up until it's all put together and you put the spurs to it.</blockquote>