I look at my Generator as a short term living arrangement.
I have an interlock installed to a 30A double breaker in my panel with 10g wire running to a 30amp inlet box outside of the house. I have a Generac 6500running 8250surge home line generator. I can power my freezers and fridge, water heater (gas power vent), oven (gas), lights (led), HE furnace, and my sump pump with no issues. Just have to be cognizant of what you’re running at one time. If I know my sump pump will be cycling, I’ll power less things. Make sure if you buy a portable generator that’s going to power anything with sensitive electronics, that it’s an inverter ($$) or a low THD generator.
I spent around $800 for the generator and installation parts. I can’t justify the thousands of dollars for a once a week event once every few years.