What is the SAE standard for wireless charging?

The SAE standard for wireless charging is the J2954 recommended practice. This standard specifically addresses the guidelines and requirements for inductive charging systems for electric vehicles, ensuring interoperability and safety between different charging systems and vehicles. It outlines the technical specifications necessary for the effective wireless transfer of energy, which is crucial for devices that may use various configurations and power levels.

The J1772 standard, while essential, focuses on wired charging systems and defines the connector and communication protocols for electric vehicle charging. J540 relates to acceptance testing for electric vehicles and their components, which is different from the focus on wireless charging. J1939 is a protocol primarily used for vehicle network communication in heavy-duty vehicles and does not pertain to electric vehicle charging standards. Thus, the specificity and focus of the J2954 practice make it the correct answer regarding wireless charging standards in the electric vehicle context.