If your generator is big enough to run the entire house, a manual transfer swith on the main line coming out of the meter box into the main house breaker is the best way to do it. A lot of these home standby emergency generator packages come with it. They have a weather proof housing and the transfer switch is automatic or manual. I chose to use a manual, Ive had to work on a lot of those automatics, in remote areas for the phone company's. Three lug connections, center is load "house" top is line, bottom is emergency power. Depending on the model and who makes it, still they are labeled.