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I bought the really cheap inverter from Jaycar (CAT. NO. MI5121) when it was on special for under $40, as I recall. An oscilloscope shows a square wave output. The power brick makes a funny buzz, but it drives the laptop. Pulls a couple of amps of the 12V dc input, as I recall, so I don't think I'd want to run it from the car battery for more that 4 or 5 hours. Have wondered if that will drop if I pull out the laptop battery. Yet to test. Still I haven't had that opportunity yet to trial it for some hours in the dark cold night!
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