New automotive connector spec speeds EV charge time

October 16, 2012 // By Brian Fuller
Electric vehicle charge times could be as short as 10 minutes using the revised J1772 EV connector spec published by the Society of Automotive Engineers.

The decade-old J1772 connector spec originally defined AC Level 1 and AC Level 2 charge levels and specified a conductive charge coupler and electrical interfaces for AC Level 1 and AC Level 2 charging. The new revision, announced Monday (October 15), incorporates DC charging, defining DC Level 1 and DC Level 2 charge levels, charge coupler and electrical interfaces.

Thanks to the addition of DC charging capability, the charging time can be cut to as short as 10-20 minutes, according to SAE.

The standard was developed in cooperation with the European automotive experts who also adopted and endorsed a combo strategy in their approach.


The charging configuration for DC Level 1 is 200-500V DC, up to 40 kW (80 A), delivering an estimating charging time (with a 20 kW off-board charger) is 22 minutes for a plug-in hybrid and 1.2 hours for a battery EV.

For DC Level 2, the numbers are 200-500 V DC, up to 100 kW (200 A) with an estimated charge time (45 kW off-board charger) of 10 minutes for a PHEV and 20 minutes for an all-battery vehicle.
Complete configurations can be found here . The new spec can be found here: J1772™: SAE Electric Vehicle and Plug in Hybrid Electric Vehicle Conductive Charge Couple .

Said Gery Kissel, GM Engineering Specialist and SAE J1772 Task Force Chairman, "We now can offer users of this technology various charging options in one combined design."