With the generators, just check what they are rated for as running watts. I've seen generators with the starting watts in big bold so you think thats what you're buying but you're running watt rating will be lower.
If you want to be safe, look up the wattage of the things you want to run, and double if. Then make sure you buy a generator that has a running wattage above that number.
I have a generac 6500watt that we run the fridges on as well when we get power outages. And ever since upgrading to LEDS, i just run my whole tank .
I want one of these so bad, but unfortunately because of the location of my gas line/power connections and surroundings, theres no good area to put it.