I wouldn't install this thing anywhere near my home even if they gave me one for free. It's not UL safety listed. It's got a wimpy surge capacity rating so it won't even start several of my home's large inductive loads, and it uses a low cost, high frequency, transformerless design so it doesn't even have an isolation transformer at its output for safety. So no thanks.
EcoFlow asserts that its DELTA Pro Ultra is its "most powerful whole-house backup solution to date". It can be solar-powered, or act as a residential storage solution with a capacity that can be scaled up to 90 kilowatt-hours (kWh) with an output of up to 21.6kW. Accordingly, the Pro Ultra is backed to power a house in a blackout that could last up to a month, and to serve all of said home's appliances at once with the new EcoFlow Smart Home Panel 2.