I'd call 540.00 outrageous. (unless that included the EMS unit in the price). I'm NOT, I repeat i'm NOT very skilled with electricity, but it is not a hard job. There are several youtube videos I saw listed. My guess is, you just disconnect all power (battery too). I would wait an hour or so after that, just to be sure power discharges. You to take the wires coming in from the umbilical, and going to the converter, and make them go to the EMS instead. Then you add a couple short pieces of wire (10 guage?) to connect the EMS to the converter. The whole purpose is to be sure all power goes thru the EMS before ever going to the camper. So installing the EMS on the output side of the converter, would not be advisable. You will notice once it is installed, and you plug it in to a power source, It takes about 15 - 20 seconds before the power turns on in the camper. That is the EMS checking that the power coming is safe to allow through. Good luck ****** All electrical guru's feel free to point out every mistake I made.