New Fast-Charging 'Combo Coupler' Standard Released

A new charging standard will allow EVs to be charged in as little as 20 minutes.

SAE International’s much-anticipated technical standard for plug-in hybrid electric vehicle (PHEV) and electric vehicles (EV) has been approved and published.

Developed in a consensus environment by more than 190 global experts representing automotive, charging equipment, utilities industries and national labs, “J1772™: SAE Electric Vehicle and Plug in Hybrid Electric Vehicle Conductive Charge Couple” enable charging time to be reduced from as long as eight hours to as short as 20 minutes.

“This new technical standard is a real game-changer,” said Andrew Smart, director of Industry Relations and Business Development for SAE International. “It reflects the advancements in technology within PHEV and EV engineering and we are pleased to represent the collaborative efforts within industry that made it possible.”

The standard represents the future of charging technology and smart grid interaction, while addressing the needs of today. Such needs include reduced times at public charging stations, enabling consumers to travel greater distances in their PHEV’s and EV’s.

“This new standard reflects the many hours that top industry experts from around the world worked to achieve the best charging solution – a solution that helps vehicle electrification technology move forward,” Gery Kissel, engineering specialist, Global Battery Systems, GM, and SAE J1772 Task Force Chairman, said. “We now can offer users of this technology various charging options in one combined design.”

The original version of J1772 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.

chargingtable_10-3-2012

The new revision incorporates DC charging where DC Level 1 and DC Level 2 charge levels, charge coupler and electrical interfaces are defined. The standard was developed in cooperation with the European automotive experts who also adopted and endorsed a combo strategy in their approach.

“Nearly all automakers approved this standard, and it will enable and facilitate EV customers to drive more all-electric miles,” said Mike Tinskey, Ford’s associate director of Electrification and Vehicle Infrastructure.

The chart showcases the J1772 SAE Charging Configurations and Ratings Terminology.


  • dutchinchicago

    “Nearly all automakers approved this standard, and it will enable and facilitate EV customers to drive more all-electric miles,”.

    What he fails to mention that nearly all automakers == all automakers that do not sell electrical cars.

    It is opposed by all automakers that actually sell electrical cars (Nissan & Tesla).

  • Van

    So if an Plug-in car fitted with the SAE level 1/2 connect pulled into a supercharger station, they could not charge. We need an AC 1/2 connector that also sports the Level 3 DC ports.

    In the US, where homes come with 240 VAC, the cars should have on board 7 Kw AC chargers, and AC level 1/2 connector, plus a DC level 3 port. This is not rocket science.

  • Volume Van

    20 minutes is awesome, and that too @ 240 Volts.

  • Modern Marvel Fan

    Just about every home in the US can’t support DC charging.

    @ 100KW, Most public infrastructure can’t support it either…

  • FamilyGuy

    Sure 20 minutes sounds a lot better than 8 hours, but it’s still not fast enough.

    Think of it this way. You’re busy, you’re out running errands, you’re on the way to work or home from work. You can probably squeeze in the 3 minute trip to the gas station. But you have to budget and plan for the 20 minute recharge trip.

    Ever pull into the gas station and see all four pumps being used? No big deal, just get behind any one pump, it will be open in a matter of minutes. Now think of pulling into an EV charging station where all 4 chargers are being used. With a potential 20 minute wait, are you going to hang around (could be up to 40 minutes before you’re back on the road)? Get out of your car and ask everyone who got there first and get in line for that charger?

    I’m a big fan of the progress. I want to get off of gas. But I just don’t see 20 minutes at practical yet. Sorry.

  • douglas prince

    FamilyGuy – You’re right, 20 minutes down from 8 hours isn’t fast enough. And there’s no point in waiting for the technology to mature, or wait for advancements in electrical algorithms, or any other matter of substance that a reasonable, rational person would expect from a nascient industry.
    You want it NOW!!! And if we can’t make I-Dream-of-Jeannie blink her eyes just for you, pudding butt, and MAKE IT ALL REAL NOW, then there really is no point to pursueing this industry any further.
    So, back to the drawing board with you, turd-monkey. Tell me, which color horse would you like to ride in on?

  • Van

    The level 1 and level 2 AC charging connectors will not charge allow an EV to be recharged in as little as 20 minutes. Here is a basic rule of thumb, if you charge at 60 kw, then in one hour or 60 minutes you recharge 60 Kwh. So, at that rate, in 20 minutes you would recharge 20 kwh. Enough to recharge a Leaf, but not a Tesla with its 85 Kwh battery. That would take 85 minutes.

    So a 240 V AC charger rated at 7 Kw, would recharge about 2 Kwh in 20 minutes. Even a Prius PHV would take about 1 hour.

    In order to provide charging rates above the 7 KW range, you need a 480 V 3 phase service. This can feed a battery charger rated at up to 100 kw. So in order to provide that “Level 2 DC charger” rated up to 100 kw, you need a commercial service, not something found in residential homes.

    Now just for grins what would be needed to pour electrical energy into your battery at a rate such that you could recharge in 5 minutes? To put 20 kwh into a Leaf sized battery, but somethng designed to be charged at that high rate, you would need to put 4 Kwh in every minute, or a 240 kw feed. That would require a 4 KV service, i.e 4000 volts, using cables about 2 inches in diameter including insulation. Nobody, and I mean no body is proposing such a system in the foreseeable future!!

    Thus, as has been pointed out again and again, the way forward at this time is with Plug-in Hybrids packing about 8-12 kwh of usable storage. The Volt hit very near the bullseye! We just need to get the price down.