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SAE International Task Force Announces Agreement on Frequency of Operation and Power Classes for Wireless Power Transfer for its Electric and Plug-In Electric Vehicle Guideline

WARRENDALE, Pa., Nov. 14, 2013 - SAE International J2954™ Task Force for Wireless Power Transfer (WPT) of Light Duty, Electric and Plug-in Electric Vehicles, has agreed upon two key factors for the Technical Information Report (TIR) on interoperability for the first phase of pre-commercial development.  Made up of OEMs, WPT Suppliers, industry experts and government representatives, the Task Force plans to complete the TIR in early 2014. The SAE Technical Information Report will be followed by publication of SAE J2954™ Standard, based on field data confirmation.

“A common frequency of operation for WPT is essential for interoperability.  After 3 years of international collaboration and investigation within the team, consensus had been reached on a nominal frequency of operation for the light duty vehicle guideline.  The SAE team has determined this nominal frequency of 85 kHz for SAE J2954. This frequency lies within an internationally available “frequency band” (shown below).” Jesse Schneider, Chair J2954 Taskforce, said.





(81.38 - 90.00) kHz




In addition, the SAE J2954 Team has also determined three power classes for light duty vehicles, WPT 1, 2 and 3. These limits are defined by the maximum input Wireless Power Transfer power rating as shown in the table below:







SAE TIR J2954 WPT Power Class








Private/Public Parking




 L.D. Fast Charge




Maximum Input WPT Power Rating




3.7 kW








22 kW




The SAE International Task Force is currently working on completing the remaining interoperability topics, including factors such as the minimum coupling factor “k”, alignment, and coil geometries.

For more information or if you would like to join the team, please contact SAE International: Pat Ebejer,

SAE International is a global association committed to being the ultimate knowledge source for the engineering profession. By uniting over 138,000 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, including programs like A World in Motion® and the Collegiate Design Series™.

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