I will soon start working on setting up a proper transfer switch. I am now deciding which one.
3400 sq ft house plus finished full basement, 200A service, almost all slots in the panel taken. A lot of little circuits. (which has its advantages). Many of these circuits power very small equipment like lights, phones etc.
The generator will be installed behind the house, very close to the panel. It will still be on its carriage.
My objective is to do work that can be UNdone if I want to sell the house. Hence, I would prefer to not do any service entrance type work.
I have, logically, two alternatives.
1. Buy a prewired transfer switch.
2. Add a large subpanel, move all breakers that I want to be on a generator, there, and insert a transfer switch between subpanel and main panel.
Note that this would involve also making wire connections in the main box, since the circuits are terminated in the main box, obviously, but the breakers will be in the subpanel box. Because of this, I am not sure if choice 2 is even legal.
Assuming it is, I see some advantages of 2) over 1).
1. Being able to add more circuits due to having an extra subpanel.
2. Being able to power more circuits in case of an outage, and being able to choose which ones to turn on and off, with breakers.
Any thoughts on this will be appreciated.