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Eric, you are right in assuming it's not a sine wave. Modified sine wave inverters vary the duty cycle of a square wave to achieve voltage regulation, they really shouldn't even be called modified sine wave. Most plugpacks will run happily from modified sine wave type inverters.
Your average car battery will be around 40-60 amp hours, I wouldn't discharge any more than 30% which would be around 13-20 amp hours, roughly 4-6 hours should be OK if your battery is in good condition.
Basically car batteries aren't designed to be discharged significantly, they're really designed to supply high currents for short periods (hundreds of amps for seconds only) and not for lengthy discharge.
Last edited by acropolite; 06-11-2008 at 02:27 PM.
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