[Playfair]

Ermin- WHOA! Wrong leads to the relay!! Crypto is right, it's the very low current power switch that get's hooked to the relay, DEFINITELY not the input DC!!

Get a NEW relay, as yours sounds pretty toasted. I used 3 of the 4 poles; one each for the neutral and hot leg of the powered outlet, and one for the inverter power. You must open up the inverter and just run a pair of wires in SERIES with the power switch. The built in switch will have to be on to operate, but in the even you are running the unit and you need to shut off AC quickly, all you have to do is flip the switch.

Don't worry man, you are almost there, but email me if you are unsure about something! BTW, the mode switch silences allows the thing to be in standby, or to put it in a "test" mode, or to just silence the alarm buzzer when in use (let's me know it's running off battery) You can add that stuff later maybe...