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Message: <blockquote data-quote="ny96j30" data-source="post: 436506" data-attributes="member: 551278">Seriously?  40 people have viewed this and no one can tell me if I should upgrade my 90 amp alt for a 600-750W load????Look, I know I need 30-50 amps to run my car's oem electrical, and the rms load of the system factoring for amplifier inefficiency is around 1000 W, so I figure about 70 amps to run the system all out.  So I need 100-120 amps to run the system at full rms power and the cars systems.So how do I, or do I need to, account for peaks? And since 5000 rpms is a worthless rating, since the car is hardly ever in that range, and I figure I'm making about 70-75 amps at 3000 rpms (hwy speed) should that be enough to keep my battery from deep cycling?  What about at idle?Thanks for the help</blockquote>

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