I have a welder type socket wired into my breaker box for just this application since I live in Hurricane country. I use a 10k and power the fridge, TV,dvd, lights,and fans with no problems. Just dont try to use hot water heater, centeral ac or stove. I bought a small one room AC and use it but turn other stuff off. When you cut the main breaker to the house you are disconnected from the main feed so you don't bleed off power and cant hurt anyone else.. cut off all unused breakers so no one forgets and turns on something they shouldnt. Be sure to disonnect everything before you flip back to line service when power returns.