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So to my understanding that 200 amp transfer switch is required because the service to the house is rated at 200 amps. The generator size doesn't really matter as long as it's maximum possible output is LESS than the 200 amps the switch and panel are rated for. The way the code works though is...

it varies city/country around here. Some areas don't care, others won't let you do anything without a permit and inspection, and they can get really pissy about things they don't understand. Stanby generators fall under that category for a lot of the inspectors around here.

Just make sure the inverter system you use is capable of both grid intertie as well as stand alone operation. I've come across a few setups where the grid intertie inverter won't function at all without a signal from the grid. Usually a standby generator will also give it the necessary signal...

So a generac ATS is controlled by the brain inside the generator. It's relatively dumb. Without a generator capable of sending a 12V signal through the transfer relay, all you really have is a manual transfer switch with some extra wiring and electron These two things (highlighted and...