I have this generator hooke dup to my home using the 220 plug. The problem I am having is when i plug my coffee maker into my house current my Voltage from my generator drops to 86volts and the engine slows down as well! what is causing this problem and doe this generator have a voltage regulator? and if it does then why does my voltage drop to 86 volts abd nt egine slows down as well but this only happens when I plug my coffee maker into it?