Comment by mindslight

I'd say the cost highly depends on what you put into it. 2-pole breaker ($30), OFBRND transfer lockout ($20), 20ft of NM-B for inlet right next to service entrance ($35), OFBRND inlet and extension cord ($100). Then a small synchronous generator $250? So that's <$500 total? Of course you'll find yourself saying I want a bigger generator, I want non-OFFBRAND electrics, I want this other extra, and the total cost creeps up.