The installer also sells a competitor's brand, but put this one on his own home. Definitely do buy the one with the transfer switch, as buying it separately costs twice as much. Tough to move into place, as I had to buy a couple of 3/4" iron pipes and some heavy rope to build a bridle, then lift it into place with a Bobcat with forks (weighs 565#), but parked it on the pad I had poured, and it's going nowhere now. Be sure to get one big enough for whole house supply, as this one is for mine, but
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even then, you can't run everything including the A/C at once. Used with a bit of sense, it's plenty big. If you live in country with hard freezes, get the heater kits to be sure it starts in frigid weather. It's worth the extra cost for insurance. Once set up, it's trouble-free, self-testing, and about the only maintenance is a yearly oil change. Get it professionally wired, as it's no job for an amateur.