The Asus EEE series uses 12V so it can be run directly from the battery, at least while the engine is stopped.
Even laptops using 19V could be charged from 12V as there are dedicated chargers usin DC/DC converters to increase the voltage to 19V
Even cheaper DC/AC converters have efficiencies around 85% so the loss is not that big.
I have had problems with environment temperature though. A converter in my car was only designed to max 55 degree centigrade environmental temp. so it cut out lying in a car in the sun in summer.
Poul
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Poul
May you enjoy peace and good health !
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