These were discussed on here a while back but I installed mine tonight. I ordered one before I moved out of the inlaws house but their mad at my wife so I never saw it. I ordered a second off ebay and installed it tonight. Installation is extremely simple. You just put the relay in series between the battery and inverter. There are two other connections on the relay that are also simple to setup. One is grounded to your cars chassis and the other is hooked to a 12v source thats only on when the ignition is on.
Instead of having to manually turn on the inverter every time you get into the car it automaticly comes on when the car is started.
I know some of you are quite familiar with relays but some on the board arent. This is for them.