My neighbor put in a 4 cylinder 24(I think)K Generac and propane tank last year. He finally mentioned the full cost. $24,000, 6,000 was a 500 gallon propane tank, filled up. This is close to Houston, TX. Just some info to share. The thing that gets me nowadays are all these 30 second outages we are having in perfect weather, had 2 today. Whole home gen would not help, we need UPS I guess. Cable, router, and TV's all take around 6 minutes to reboot. They are installing a Battery Farm a few miles from us, might be why. Fairly large install, hope it helps. We are not big on EV's in my area so maybe they can charge the batteries at night instead of a bunch of cars.