As indicated earlier, I believe the OP use of a portable battery/inverter is well suited for that use.
But it appears some clarification might be in order...
Had a 3300W Honda. Gave it away. Storing usable/fresh gasoline was a problem. In case of that earthquake disaster, no gasoline supply would be available locally. Note... gas in vehicles would be used to exit area...
Multiple Anker Power Stations sit at the ready and are load tested/cycled monthly. 500 feet of twin solar cable is ready to connect the 5 portable solar panels. Portable solar panel size was partly determined by how much weight this 75+ year old person could handle.
My electrical 'career' began January 1971 at the US Navy Electrician's Mate school in Great Lakes. The ships I served on, WW2 Destroyers and a post WW2 Destroyer Escort, had 600 # steam powered turbo generators and auxiliary emergency diesel generators. I'm very much retired now. In the interim was extremely active in the heavy industrial / mining electrical and instrument process control fields both as an electrician and as the electrical contractor, Calif C-10. Experienced with KW to multiple MW generators powered by diesel, gas turbine and steam turbine.
My choice of emergency / disaster power is solely based on personal experience. Also have emergency potable water and reliable local / world wide communications capabilities (W6AJO).