I have been told by Nissan that ONLY the Aerovironment EVSE may be used and received an email saying "I must provide proof of compatibility of any other EVSE".
That seems to force everyone to either use the Level 1 120V slow charging or pay for the AeroVironment at whatever price they demand. Aerovironment told me I could only receive the federal tax credit if I used them. Seemed very odd. They claimed safety but everyone would use the SAE J1772 connector and only the communication is left. The SAE 2487 communication is not as yet defined since the Smart Grid is not yet deployed. AV provides a card that allows some future upgrade depending on how the Smart Grid communication protocol goes. Other than that, they light some LEDs. So that only leaves the GFI circuits which have been used for years.
Remember the Level 2 is just 220V which is just two 120V legs to earth so from an earth to conductor point of view, there is no safety difference. Its almost impossible to put your body across that SAE J1772 connector to get 220V so from a safety point of view, Level 2 EVSE's are only marginally more dangerous than Level 1 and every 120V chord and outlet in your home represents a greater hazard. So what's the safety issue? What's the compatibility issue since the Comm channel is TBD?
So any EVSE can provide physical layer compatibility with the 220V through connection and GFIs.
At the upper layers, the common channel is up for grabs even though a PLC or Power Line Modem at level 1 makes most sense to get back to the meter. If they want to get to the homes internet connection, they better think that one through carefully. I see just about every communication protocol is being considered - just like everywhere else from Zigbee, to Bluetooth to PLC to WiFi.
Something is wrong!
http://www.franklin-gov.com/Modules/Sho ... entid=3119