in my mind I just couldn't justify the price when all I could find was them priced at 16k to 20k installed, we only had a regular geny we used via extension cords and such. When I found the company in kingfisher quoted us 10k for a 22kw installed with the auto transfer switch and the whole shebang I was in. I won't own a home now without one. I am just getting to old to hassle with not having power when i need it. a few years ago we ran our stand alone generac for a week if I remember right. It worked and we had limited power for the house, but it was winter so no ac need. It ran the furnace, fridges and lights and stuff and we had cords everywhere but everyday you had to go get gas for it. This thing if we lose power for I think 15 seconds it kicks on.