I have a timer operated switching panel that I built and had inspected by both the city of San Jose and city of Santa Clara. It allows one 14-50 receptacle to be shared between two Teslas and lets you select the time and length of charge for each car. I built it so I could take advantage of PG&Es lower cost of electricity in the middle of the night to charge both my wife's and my Tesla. It is FREE as I no longer need this panel and will give it to anyone that can use it. It does need to have a new 14-50 receptacle put in the box as I used it when I upgraded my system from 50 amps to 100 amps. It is located in San Jose.