You really ought to take a hard look at Generac's Nexus Service Disconnect 200A switch with load shedding. All you need is a generator with KW rating for critical power needs (including items like well pumps and sewage pumps) and comfort needs, and with a little discipline and load understanding during a power outage, you can get by with a smaller generator than you think. Lower cost, gas consumption, and noise level can result. With my house, the 10KW unit works (the smallest with the Nexus switch), but I have to increase my gas meter size. Elizabethtown Gas does that at no charge.