I have a 4k generac runs the whole house, furnace, sump pump freezer. Exercises once a week for 10 minutes. Does not run voltage to the panel during the exercise period. Air filter and oil filter you can get from napa. I've had it over 10 years
They seem to be always working on those power lines. Put to many hours into that club in the beginning and got burned out. The s-10s seem to do a good job. Class A groomers are pricey and the club has limited funds