Can I use a power inverter?

Hello everybody
I did'nt know where to post this question...anyway
I have a show this weekend, and my booth doesn't have electricity, is it at all possible to take a car battery in with me and use a power inverter for powering my imac?
If I am running a slideshow demo, how long would the battery last?
does anybody have any other suggestions for powering the imac w/o power nearby?
thanks
Rob

If I had no choice but to use batteries, I'd:
1. Use at least 2 apple laptop batteries intended for my computer (fully charged).
2. If I also needed power for other items such as a camcorder, etc, I'd rent specialized 12 v. (low amp) batteries called "Bricks" from a video rental supply outfit prior to the trade show time. And I'd test the brick/s prior to showtime.
....or.....
If it were physically impractical to have an 120 AC outlet installed at my own booth, I'd ask to share electrical with a nearby booth while offering to pay for the entire service for both booths & run a heavy duty electrical extention cord grounded and carefully duct taped to the floor (along the back of the booth) or where there is very little /no traffic.

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Can I use a power inverter?

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