I'm trying to get a little diagram, but idk how good it is, and if it will work. I also don't know what parts to use (what relays to buy, what capacitor to buy). NO one at any radio shacks have a clue, and no response yet on the board .
I've been posting it here.
I also think I'm going to go through the switch that actually turns on the inverter, instead of the power line that goes to the inverter. That should make the capacitor smaller that i need to use in front of it (for shutdown delay). I've also thought about a small 12v battery infront, but that would take a LONG time to shutdown the computer (my UPS batt lasts 5-15 mins, probably 15-30 on a low power system.)