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There are several ways. A 12 volt to 240 volt power inverter from say Jaycar/Dick Smith. Generally the cheaper ones are not modified to deliver "clean" power so it is wise to pay the extra $ for one of these, I think a modified 150 watt inverter will cost about $200??. You can look in say Repco or your local Harvey Norman computer type stores as some carry a cig lighter adapter that have a voltage selector switch and interchangeable "heads" for the power supply lead that goes into your laptop, theseare generally around $50-$100. Of course it is very important to set the correct voltage for your laptop and get the polarity of the "head" correct. Just make sure whatever you use it has a fuse between the battery and laptop as I think you will find the above do. Some laptops draw a bit of power so if you are using your cars main battery be aware of this so you don't get caught at that dark sky site with a flat battery.
PeterM
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