I have installed, I'm guessing over a thousand emergency generators over my career. The company that worked for, installed Generac for residential. We installed both Kolher and Generac on the commercial side. Both are good units. There are several options available with the transfer switches.
I don't think you will disappointed with either choice.
I would go with a 15Kw with automatic start. I would not go smaller than 12.5Kw.
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