High power PSU with shutdown controller
I want to have a powerful computer system in my car. A 150watt opus for sure will not provide enough juice. If I use a power inverter to power my computer, will I still be able to hook up a shutdown controller ? I can allow my car to stay on for a certain time afte I remove the key, much like a turbo timer.
Say I get a ITPS and only hook it up to the computer switch. When I remove my key it will trigger the ITPS to push the power button on my PC thus making it to hibernate. After a certain amount of time my car will turn off and cut the power to the computer after it finishes hibernation. Will this work ?
Another question is, does ITPS pushes the power button to turn on the PC as well ? or do I have to set my PC to "turn on upon power" ?
Currently is there any high power (300watt + ) 12v PSU with shutdown controller ? I have searched all over the place and still could not find one. I know it is stupid to convert 12v to 110v with a power converter and back to 12v with the PSU, but so far that's the only solution i could find to provide enough power for my computer.