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Message: <blockquote data-quote="91Chevy" data-source="post: 6056336" data-attributes="member: 603461"><p>2500W will take 181A at 100% efficiency.  Realistically (and still being quite optimistic), 80% efficient will leave you with 217A.  With the stock alternator being probably 110A (140A even, who knows), he'll still be lacking MAJORLY.  Unless you are only planning on listening to your music for short periods of time, I'd suggest a bigger alternator.  Mind you, you'll rarely see full power draw, but even at mid-high volumes your alternator won't be able to keep up, and having more battery space won't help that for long periods of play time.  Even at 2/3 volume that's 145A.</p></blockquote><p></p>

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