I have the 20 KW Generac system with the automatic transferswitch and it runs itself once a week to charge cranking battery and "exercise" itself. Runs on natural gas. House is over 4000 sq ft. You don't have to run the entire house, just the essentials. Be sure to get a hard start kit for your A/C unit or units if they don't already have them. Makes it way easier on the Gen set to start them. One of the worst things you can do with a genrator is have too much capacity meaning you want to be able to load it up to 65-75% of it's total output. You won't regret doing it Chad.
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