STANDArDS & COMMITTEES SAE J3271: The Megawatt Charging System (MCS) standard Technical information reference released; prototypes shipping soon. Written by THEODOrE " TED " BOHN, Principal Electrical Engineer at Argonne National Laboratory. Bohn is the chair of SAE J3271, AIR7357, and IEEE P2030.13, among other standards working group activities. Commercial electric vehicles have moved from concepts to prototypes and now into production with ever-increasing battery capacity. Larger-capacity batteries to support longer-range and load capability up to class 8 vehicles require higher charging power to keep the recharge time manageable. SAE J1772 (CCS) based DC charging systems can deliver up to 1000 V/500 A today (500 kW). SAE J3400 (NACS) DC charging systems may deliver up to 1000 V/900 A (900 kW). Commercial vehicles have a short time available for battery recharge, with a goal 50 February 2024 of charging time equivalent to present liquid refueling. The work-in-progress DC charging standard SAE J3271, which is focused on Megawatt Charging Systems (MCSs), may deliver up to 1500 V/3000 A (4.5 MW). The SAE J3271 working group was formed in 2021 as part of the standardsmaking process for a standards-defining organization to transform the CharIN MCS task group industry stakeholder requirements document into a standard. The members of the CharIN MCS task group are the same members of the SAE J3271 committee. SAE J3271 has 135 registered members and a 360-person distribution list, making for diverse membership input to the document creation process. The first draft of the SAE J3271 Technical UPDATE Scaniahttps://www.sae.org/standards/content/j3271/