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Message: <blockquote data-quote="johnecon2001" data-source="post: 742614" data-attributes="member: 556589">watts / volts = amps.So if you draw less watts, then the amperage will be different. I believe that amps with a regulated power supply can draw a constant, but there are very few of these and the price tag climbs significantly. So assuming your electrical system has a 14.4v charging capacity then 1000w/14.4v = 69.44A. Where 500w/14.4v = 34.72.The size of the cable can limit the power available to the amp. Although if you over draw a cable, most likely what will happen is an electrical fire or you pop the fuse.</blockquote>

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