hello everyone. Im sorry if this is a dumb question but I have to ask. Im putting together a small 12v battery backup in my house for emergency power. I have a 2500 cobra inverter that has to be grounded. Since this setup will be In the living room while in use, is it possible to ground it by attaching a grounding wire to a nail and sticking it in the ground of my wall outlet? Once again sorry if that's a dumb question. I just figured since the 3rd hole in the wall outlets are the ground that it would make sense. Thanks for any advice.