Last year as a sort of adjunct to the OpenEVSE project, I created a device called the J1772 Hydra. It's designed to allow two plug-in vehicles to share a charging station, but to do so safely and in full compliance with the J1772 specification.
I haven't posted about it here before because it's less of a perfect fit for Tesla owners, but it's conceivable that there are Tesla owners with more than one EV at home and a J1772 EVSE that they use for both.
The Hydra is tailor made for households that have a time-of-use electricity tariff, such as PG&E's E-9, which encourages them to charge overnight. With the Hydra, you don't need to switch the plug from one car to the other at 2 AM.
It's an open hardware project, like OpenEVSE. Plans and firmware source code are freely available. Also, I have a square market store where I sell the boards as both "quick kits" (which is the board with all the surface mount components preassembled and preprogrammed, and with all through-hole parts for you to install yourself) and assembled and tested.
For more information, check out the Hydra wiki page at https://code.google.com/p/open-evse/wiki/Hydra
I haven't posted about it here before because it's less of a perfect fit for Tesla owners, but it's conceivable that there are Tesla owners with more than one EV at home and a J1772 EVSE that they use for both.
The Hydra is tailor made for households that have a time-of-use electricity tariff, such as PG&E's E-9, which encourages them to charge overnight. With the Hydra, you don't need to switch the plug from one car to the other at 2 AM.
It's an open hardware project, like OpenEVSE. Plans and firmware source code are freely available. Also, I have a square market store where I sell the boards as both "quick kits" (which is the board with all the surface mount components preassembled and preprogrammed, and with all through-hole parts for you to install yourself) and assembled and tested.
For more information, check out the Hydra wiki page at https://code.google.com/p/open-evse/wiki/Hydra