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The outlets are most likely rated for someting like 400 watts max. Even if they were rated for that amount of power, you would kill the battery really fast. Anything that electrically generates heat for a large mass (george forman, clothes iron, etc) will draw lots pf power. If the George forman is consuming 1500 watts that woula reqquire 125 Amps from the car battery. Thats HUGE and very likely more than even the stock AC outlet can provide. Even your upgraded battery won't supply this much current for long before its dead. Even with the car running your alternator will not put out 125 AMPs (thats usually a heady duty alternator rating at highway RPM) so you could run the battery down even with the car idling.
Look in your manual and see what the maximum power draw is form each socket is .
TO calculate the power look at your device power consumption ratings for all your devices you'd like to power together and add them together.
Last edited by DanEz_yoda; 10-04-2008 at 04:59 PM.