I can help you a lot with the custom linux interface
As for power supplies, it's an interesting issue It comes down to this: Do you want to get a DC->DC power supply? If you do, you will need to figure out how to wire an ATX power supply to the G3. To get a 150W DC/DC ATX power supply, you'll be looking at probably $180 (including something to clean the power).
Or do you want a new AC->DC power supply, in addition to a high performance DC/AC converter? (You'll want to make sure that it provides a high enough wattage, and that it's clean). Again, you'll probably have to figure out how to get an ATX supply wired into the G3, but you're looking more towards <$100 (though efficiency will go down and it will draw more juice from the engine).
Also to worry about is crank power (you won't be able to run the computer while cranking the engine), and how to power on and off the computer.
Idealy you'll have an extra big battery to supplement the power comming from the car's main electrical system so that durring cranking or whatever you can provide uninterupted power to the computer.
I have quite a bit of experience researching all of this stuff, so if you need anything else, just ask.
DC>AC power converter from the outlet powering a quiet (quieter than the one in the tooth) ATX powersupply. I didn't think about the uninterupted power for the computer during start/stop so good call on that one. i supposed a UPS work just fine.
My question is which ATX power supply will be the best, providing 150 without making much noise doing it. In fact, the car is quiet so a quiet power supply is a must (its an SUV so trunk install isn't an option)
That setup is *completely* fanless. The power supply is supposed to just snap onto a mini-itx board, but you'll have to splice cables anyway to get it to work, so why not?
You can probably fit it all in a small little radioshack project box.
And magnus, as a bit of a pet peeve - there is an edit button for a reason.
Edit: This Opus PSU may have a fan, but it can withstand engine cranking, which is pretty cool. It will even automatically power up the PC, and allow you to set a timer for powering down the PC after you turn off the ignition (ie, set it to keep the PC on for 4 minutes, so if you're fueling your car, you can have it stay on while fueling, then turn the car back on, and it cancels the shut down). It looks like it might definitely be worth the $100.
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