[Paul Elliott]

I was running my EeePC 4G overnight, hooked up to some power measurement stuff. For anyone who cares, here are the numbers I got:

All power data taken with EeePC operating (showing video, full-brightness screen), obviously with a sample-size of one. The only peripheral attached was a mouse, and I was running a WiFi connection to the computer. There were no external memory devices attached. The unit was run overnight prior to the test, in order to achieve some sort of stable operating condition (I hope).

The supplied "wall-wart" power supply provides 9.5V, EeePC draws 2.08A while operating. Unit switches to battery when external voltage (wall-wart output) drops below 9.1V.

Using a "Vanson SDR-30W" power adaptor (cigarette-lighter 12V in, 10V out to EeePC, purchased at Radio Shack):
house battery @ 15V, drain = 1.05A
house battery @ 12V, drain = 1.20A
house battery @ 11V, drain = 1.30A
adaptor drops out @ 10.2V and EeePC reverts to internal battery.

I also tried a Xantrex "Pocket Inverter 175", using it to power the AC wall-wart. It worked fine, but the current taken from the house battery was about 25% greater.

Compared to my laptop, this power data is all quite good. It is also better than the ITX / "car-computer" units I've looked at, but their published specs I'm sure don't tell the full story. The issues will be OS, and memory. I do not plan to use this as a chartplotter replacement, but to run other stuff 24/7 (if it all comes together).