This SAE Recommended Practice SAE J2847-2 establishes requirements and specifications for communication between Plug-in Electric Vehicle (PEV) and the DC Off-board charger. Where relevant, this document notes, but does not formally specify, interactions between the vehicle and vehicle operator.
This document applies to the off-board DC charger for conductive charging, which supplies DC current to the Rechargable Energy Storage System (RESS) of the electric vehicle through a SAE J1772™ coupler. Communications will be on the SAE J1772 Pilot line for PLC communication. The details of PowerLine Communications (PLC) are found in SAE J2931/4.
The specification supports DC energy transfer via Forward Power Flow (FPF) from source to vehicle.
SAE J2847/2 provides messages for DC energy transfer. The updated version in August, 2012 was aligned with the DIN SPEC 70121 Candidate 2 and additions to J1772™ for DC charging, published October, 2012. This revision will include results from implementation and changes not included in the previous version. This will also include effects from DC discharging or Reverse Power Flow to off-board equipment that expands on J2847/3 for AC energy flow off the vehicle, and other Distributed Energy Resource functions that is being developed from the use cases in J2836/3™, published January, 2013.