First off, safely using a generator to power eg your home furnace requires some costly wiring and installation of a transfer switch (yes you can do it more jankily but let’s please not.) Moreover: this installation does not compete with the cheapest portable generator at Home Depot, I assume it competes with a dedicated standby generator. Those are much more expensive, and run closer to $3k without installation (which is way more: they require a pedestal and a bunch of hardwiring and a dedicated fuel tank/gas connect.) I looked into a standby generator after an all-day wintertime power outage: it was both annoying and cost-prohibitive. If I could protect my home pipes from freezing in such a future outage by using my existing vehicle, that would be amazing. My threat model here is not “prepper looking for weeks of regular grid independence”, it’s “cheap and clean way of keeping my pipes from freezing during a 1-3 day wintertime power outage.” If I can amortize the electrician cost of installing a charger while also getting this feature, that’s even better.