I’m not sure how to wire this without hiring an expensive electrician.
I only lose power maybe once every 12-18 months in the 30 years I lived here. Only twice over 24 hours.
You can buy generators for the entire house, or small ones that may do a couple of appliances. If you want to do the entire home, likely need to tap into the power box and set up the swithces. However, for small one, you simply start them, and plug your appliance (freezer, frig, etc) directly into them with an extension, bypassing the power box, so no need to hire electricians.
I only lose power maybe once every 12-18 months in the 30 years I lived here. Only twice over 24 hours.
Maybe it's time for you to go back and read that book again that you use as your Freeper ID.
Come to think of it, I should go in the basement and find my copy. Along with "The Earth Abides"