Hi, instead of buying the package sold by Go power or Progressive dynamic, I bought a simple AC relay (30A) with a 120 VAC coil to switch current between shore power and inverter in my RV. I connect the coil with the black and neutral wire of the shore power to switch the AC power when the shore power is plugged. The problem is that the relay is chattering when I use it with some particular load. For example, when i use my heat gun at medium power, it chatter a lot, but It doesn't when I use it at high power ??? I remove the relay from my rv to make some tests and it looks like when I use two differents circuits (from two differents breakers) for the coil and the main, it works fine. What can i do to prevent chattering when I plugged the coil and the main with only one circuit as what it is possible in a RV ? Thank!