We've not hooked up the transfer switch yet but we have ran a lot of extension cords during an ice storm last year and kept all our aquariums going, all 700 gallons of them
If you’ve had it for that long without installing the crucial part of what you described above as a major selling point, I think that would have been useful to volunteer in the original comment lol.
The extension cord thing was interesting too, but “I sold my partner on a feature that turned out to be more trouble than it was worth to set up” is super relevant to discussion!
We haven't needed to yet. Our primary concern are those aquariums and it worked wonderfully for them when we needed it. Much better than running through over a hundred dollars a day in propane to keep them running, and the truck parks in an insulated garage so no cords to a generator through a window letting the cold in
