DO NOT BUY A GENERAC STANDY GENERATOR!
They are cobbled together differently from year to year, model to model, Home Depot version to Rona to Costco, to Dealer/Installer models. They can be a mofo to get parts for. Circuit board, relays, sensors and the engines are often Chinesium versions of brand names.
Take my advice for whatever you think it is worth but I recommend Briggs and Stratton's homeowner line. And depending on where you are located Sommers is about the best company you will ever hope to deal with, for anything.
https://www.sommersgen.com/
Their prices are fair, their installation is first class and their service is quick and fairly priced. They have tons of parts in stock and Briggs has evolved a long time ago into the best parts and assemblies.
Whatever you do, don't buy a home gennie or installation
through Home Depot. They farm it out to third party installers who might not be around in a year or two WHEN you need a repair.
A cottage neighbour had one and had three technicians out five times and nobody could fix the problem. Starter was burned out the first winter. Took 3 weeks ot get a new one insatalled. The is still wouldn't always start. Said it was the carb, then the control panel, then it needed an engine rebuild. Not evn 100 hours on it in two years.. Then it was out of warranty. Sometimes it would work, other times not.
Took me 15 minutes to diagnose that the engine block heater was not connected. Wasn't ever connected since new. So it would start only above certain temps. When it got really cold, like -20F it just wouldn't fire up. It would crank a few cycles, then shut down to let the started cool off. Then it would crank again for a while then shut down. Sometimes it would start, other times not. Home Depot and Generac were less than useless. The original installer had gone tits up. Blah blah blah.
Googe to find out about how bad the problems people have with the brand. Disregard the positive reviews because there is nothing to gush about if the generator works. It's not like you can compliment them on the ride quality being smooth enough to circumcise a baby.. or fine corinthian leather. They either start and run or they don't.
Hope this helps.
Oh and Briggs and Stratton has a pretty good webpage to help you decide on the right model. Coiuple things... If you can stay under 10kw, you will use a smaller engine with better fuel economy. And because they are not inverter systems, they run at wide open throttle whether you only have a nightlight on or have AC and the clothes dryer running.
If you don't have an elelctric stove and are ok without using air conditioning and the clothes dryer during an outage, a 3000 sf house should be fine with 10kw.
Also, Briggs has a smart load sensing system that can allow AC, Dryer, Stove to be conencted and the load managed if adequate power is left within the generator's rating.