Creative use of relays - will this work?
I thought up something that to me seems like a very cunning plan, but that may be because I don't know my volts form my amps... I have spent the evening looking around this forum, and I haven't found anything quite like this idea. Here goes:
If I take the trigger power for the relay I use on my inverter from the 12 V on the PC, the inverter will turn off when the PC shuts down. And if I use another relay to send a pulse to the ATX power switch when my power doors lock, the PC will go into hibernation and cut the power. Then both the computer and the inverter will be off. And I never lock the doors if I'm not going out of the car (I usually lock it with the alarm remote, but when I leave the dog in the car I have to lock it manually, that's why I want to connect the shutdown relay to the door locks). And to turn on the PC (using automatic power on from the BIOS) I can run an extra relay for the inverter trigger with a jumper button on the dash (since I don't always run the PC when I take a short drive) for the inverter.
I don't have to worry about what might happen if the computer does not get the shut down message every single time (actually I'd be satisfied with 90 %) since the inverter has a low power shut down and I will power this whole system on a battery separated from the main battery - my Suburban does not have it now, but I'm preparing to put in an extra battery and a multi battery isolator since I have room for another battery under the hood.
Are there any flaws in this? I hope the regular 12 V on the computer is strong enough to power a stock car relay, like the one you use on extra lights and stuff. That really doesn't take much current, does it? And the computer's powersupply won't be in connection with the car's power supply since I only use it for the relay duty, not to send the actual power to the inverter.
Have I found a very simple, cheap and efficient solution to my specific problem (turning the computer off when I lock the doors, but turning it on with a button) or am I a very simple, cheap and efficient idiot? :D
Thanks a lot in advance!