It has other downsides, obviously. But the notion of "emergency power for your house" isn't really anything special.
My experience with power outages (after big summer storms, not a hurricane thank goodness) has been that my neighborhood is impacted, but that places nearby have power. They tend to restore commercial first, so the supercharger near me is up and running before my house.
And are regularly rotating that stockpile, because gasoline has a shelf life measured in months
There are practical issues with it, but it's possible. The question is EROI or Energy Return on Investment. Do you get more energy from it than it took to make it, which unfortunately is not there yet. Shrinking it down to fit into your backyard is an exercise left for the reader.
And that's assuming they are sunny days.
I am guessing that one of the use cases is a support unit to charge an EV just enough to get it to a charging station.
You would need to add an accessory generator (which probably won't fit under the hood) and possibly upgrade the cooling system.