The outages that only last a couple of hours are nothing more than a nuisance. When it starts reaching a day or more, it becomes a goddam nightmare. Without the well pump, you have no running water. Without water, you cannot flush the toilet. The refrigerator contents start to spoil. In the winter you have no heat. Residual water in the pipes can burst.
I would be perfectly happy with just the essentials. Well pump, furnace, and refrigerator. A 2 kW source with enough surge for motor starts would be enough. Not sure if 7-10 kWh would be enough to cover 2-3 days. You can manage the well pump by planning your use for brief periods of running; it has a very low duty cycle most of the time anyway, even in normal use. You can manage the furnace to an extent by building up a lot of heat and then letting it coast down for hours. The one you can't really manage is the refrigerator. But overall, this looks promising. It would be a lot more practical than a generator where you have no natural gas hookup.
Right up until I learned it does not include an inverter. WTF? My eyes rolled up in my head and I groaned. Shit. How stupid can you get with your marketing? OK, you also need changeover provisions. So maybe this is the province of a specialized reseller. Until I hear from one of those and hear the bad news on the bottom line, I am utterly unimpressed.