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SAE International Releases New Specification (SAE J3068) for Charging of Medium and Heavy Duty Electric Vehicles

; Date: April 26, 2018

Tags: Electric Vehicle Charging » Electric Big Truck Charging

The task of charging a big truck in a reasonable time requires a heavier-duty charging system than the Combo Charging System used in electric cars. A big truck might easily have a 1 megaWatt-hour battery pack, and a reasonable time to recharge might require a half megaWatt charging rate. Those figures are educated guesses. A factor cited in the press release is a requirement for 1000 volt system voltage, which of course requires certain specifications for the wiring.

Research report from March 2017 for the J3068 committee (epri.azureedge.net) https://epri.azureedge.net/documents/2- SAE J3078 AC Charging Update_March 2017_McGee.pdf

This slide deck suggests J3068 would use the European Type 2 connector in order to support 3 phase AC charging: (epri.azureedge.net) https://epri.azureedge.net/documents/2_SAE_J3068_AC_Charging_October_2017_McLaughlin.pdf

Good summary with several sources: (insideevs.com) https://insideevs.com/sae-release-charging-standard-for-big-rigs-trucks/

2018-04-26 WARRENDALE, PA. SAE International’s recommended practice for plug-in charging of heavy duty EVs has been approved and published.

(www.sae.org) J3068: Electric Vehicle Power Transfer System Using a Three-Phase Capable Coupler” was developed from existing international standards, which were extended to cover higher North American grid voltages and higher power levels. J3068 allows vehicles to fully utilize three-phase AC power where it is available and preferred, such as at commercial and industrial locations.

J3068 was developed in a consensus process by SAE International’s Medium and Heavy Duty Vehicle Conductive Charging Task Force Committee, which today is comprised of over 100 global experts from the automotive industry, utilities, charging equipment manufacturers, national laboratories, and academia.

"This new standard was designed to offer a single vehicle charging coupler solution for three-phase and single-phase AC and DC charging for a class of vehicles," according to Rodney McGee, Chief Engineer of EV Projects, University of Delaware, and SAE Medium and Heavy Duty Vehicle Conductive Charging Task Force Chair. "We wanted to combine this new approach for AC charging with 1000V DC charging based on existing SAE communication standards."

"The goals of J3068 include bringing a proven, mass produced three-phase charging coupler to North America, and establishing a low-cost, reliable communication and control protocol for AC with inherently high interoperability" said Jim McLaughlin, document sponsor and retired Mack Trucks electrical engineer. "High power AC charging has cost advantages in many use cases, and three-phase charging simplifies balancing of the power grid."

For more information about “J3068: Electric Vehicle Power Transfer System Using a Three-Phase Capable Coupler,” or to purchase the standard, visit (www.sae.org) https://www.sae.org/standards/content/j3068_201804/.

Credentialed members of the media may request a review copy of the standard by emailing (sae.org) pr@sae.org or calling 724-772-8522.

SAE International is a global association committed to being the ultimate knowledge source for the engineering profession. By uniting over 127,000 engineers and technical experts, we drive knowledge and expertise across a broad spectrum of industries. We act on two priorities: encouraging a lifetime of learning for mobility engineering professionals and setting the standards for industry engineering. We strive for a better world through the work of our charitable arm, the SAE Foundation, which helps fund programs like A World in Motion® and the Collegiate Design Series™.

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