Ours is an 7kW/9kW (starting/running) Costco Special, picked up with a $250 discount for $500. We bought a mechanical interlock that fit our main breaker panel ($75). Then, just had to install a 60A 240V outlet ($50 and electrician was like $80). Turn off main breaker, slide interlock up, turn 60A generator breaker on, then slowly turn on all the other breakers. We can have our hot water heater, stove, fridge, deep chest freezer, and every light/fan on in the house without bogging it down. Basically everything in the house, just no A/C. My neighbor has a 15kW portable (its a beast) with manual transfer switch and he can run his A/C. He also left one light in his house on utility power so he knows when the utility comes back on. That may need to be a necessary upgrade for us in the future.