I'll share my experience.......long winded as it is!
I bought a B&S 9,000 w gasoline generator about 4 years ago. I wanted portable power to run a welding machine at the back of our property and also to supply back up power for the house. I built a doghouse enclosure with a hinged lid and exhaust vents. It also has manual louvers on both sides to allow it to run in a storm.
I exercised this unit monthly to make sure it was able to start. I have a battery maintainer on it to keep the starting battery charged at all times. I rewired one panel in my house to isolate the incoming power and only run this one panel with my sump pumps, freezers, and refrigerators. I do have to manually switch it all over which only takes a few minutes, but again it is manual.
The first time we had a power outage a couple of years ago, I reluctantly waited until midnight to switch it on. I was hoping power would be restored. About 3 am, I hear the furnace shut down and my CPAP machine goes off! (I had run an extension cord for it and a couple of lamps upstairs). I knew a tank of fuel would last longer than that, so I get dressed and go outside. Lots of fuel, but will not restart. Hump the darn thing around to the garage in a snow storm to find that en electric cut off switch on the carb bowl is faulty and fuel is leaking.
Next morning, a rental is nowhere to be found locally, but finally find one about an hour away at HD. Go get it and connect it up. Nice Makita unit with no bells and whistles, but does the job. After a couple of hours running on a Saturday night, I notice half the circuits that are powered off it are not working. Seems it has dropped one leg of the 240 volt supply. I take it apart the next morning and all looks good. Start it up and I have both legs back. A few hours later, it drops one again. I manage to get by on the one leg until power is restored. return the rental and express my displeasure! Guy could care less. He plugs a drill into the unit on 120 volts and says "see, all good!" Yeah, I'm out of there.
My B&S unit was under warranty, so I take it to a local repair center at beginning of April. End of July, I cannot get this arrogant idiot to complete the repair. Even when he says he has the part and will get to it when he can! I have had work done there before on my tractor under warranty, but will never go back. Great Mechanic, but arrogant as all hell.
I'm back running on this unit, but have not needed it since. When I got it, I did put a load on it and checked the output power with a scope meter to see what the sine wave looked like. It seemed good (Pretty clean) and has not harmed the electronics in my new furnace so far! It was not rated for electronics and is definitely not an inverter unit.
We decided this morning to invest in a Generac automatic switch over unit with retirement pending in the near future! I would like some piece of mind if I go away in the winter without putting my Daughter through the ordeal of checking the house and having to do the changeover procedure. it is simple enough for me, but not for someone not so inclined. We are fortunate to have Natural gas.
I am so done with this portable generator crap! I also have a small portable for camping and assisting family members that is 2200 watt.
Good luck with your adventures! I think I will go outside and see what surprises await me in the generator enclosure this time!