The gen set I got runs "dirty" electricity. It's hard for me to explain but it's not good for sensitive electronics. So I won't run the stove or computers off of it. I probably won't even directly charge my phones from it. They can fry the motherboard. I had a bad 240V socket in the house and it fried the motherboard on my oven about every 6 months until I had it replaced.
I will only turn on the breakers for my microwave, fans for my natural gas fireplaces and a few lights/outlets and my freezers and refrigerator. Figure around 800 watts per fridge and freezer then whatever