How can I power my macbook in the car.

Want to use my macbook in the car.  The power inverters that I have are not working with the current power cord that come with macbook pro.  Any options ?
What are the power invert spect that will enable the macbook to be charged /used in the car ?
Thank you

Hey Kanadakid
Recommendation for your consideration:
I use an inverter I purchased at Kmart on sale for about $30.00.
These devices hooked up through the cigg. lighter "convert" your 12 volts D.C. from your car (actually about 13.8 volts ) to 110 volts A.C.(mine 400 watts). It even has a 1" fan and fully fused.
Mine is about 6"x4"x2" and has a near perfect sine wave output: I put in on a 'scope to check it out.
Can run even moderate size TV, Stereos. I plan to charge my brand new iPhone 4S (64G) using it. Staches under the seat.

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