How long will 20 gallons of gas last if you ran a 2kw generator to keep a chest freezer and refrigerator going and maybe a few lights?
Depends on if you run the generator constantly instead of cycling it on and off.
I burned through mine in a couple days mostly keeping the generator running for a fridge, window unit ac, fans and some lights thinking the power would be back on in a couple days. It wasn't...
The Honda eu2000i is pretty good on fuel, and fairly quiet. Well - none of them are quiet - but some are a lot less loud put it that way. The Yamaha equivalent is supposed to be good as well. I’d think with relatively light loads like that 20 gallons running 24/7 should last a week.
I had to look it up, since you brought it up. The Honda is rated at 2000 watts, but only for 30 minutes. Continuous duty - 1600 watts. They are probably all similarly rated. That will run a fridge, and some lights, or a coffee maker, or TV, etc, though not all at once.
At 1/4 power consumption (400 watts) the fuel tank supposedly lasts 8.1 hours. It holds just shy of 1 gallon (.95) At full rated power, the tank lasts 3.4 hours. So my guesstimate of a week isn’t too far off, and that would be running 24/7, which really shouldn’t be necessary.
I bought a boat style tank and hose assembly, with a custom CNC machined cap, that extends the range time considerably, though have never had to use that.
You need solar panels / storage batteries / inverter also for more than a few days of electrical outage. Doesn’t have to be a permanent installation. Mine don’t even breath hard keeping the refrigeration going. Just be sure to keep the refrigerator door closed tight!