Megawatt Charging Systems (MCS)

The Megawatt Charging System (MCS) is a new international charging standard developed specifically for heavy-duty electric vehicles, including HGVs, coaches and buses. Published in the UK as PD IEC TS 63379:2026, the standard defines a new high-power connector system capable of supporting operating voltages of up to 1,500 V DC and continuous charging currents of up to 3,000 A, providing a theoretical charging capability of up to 4.5 MW.

Whilst the standard establishes the maximum operating envelope, many heavy-duty vehicle manufacturers are currently developing platforms based around 1,000 V DC architectures, with first-generation MCS installations expected to operate at substantially lower power levels than the theoretical maximum. Tesla is widely expected to adopt an electrical architecture of approximately 1,250 V DC for the Tesla Semi. Higher voltage MCS applications are more likely to be adopted initially within the mining, aviation and port sectors, where vehicle energy demand, operational duty cycles and power requirements are significantly greater.

For electrical engineers, MCS represents far more than simply installing higher-power chargers. The increased electrical demand introduces new engineering challenges in grid capacity, HV and LV electrical distribution, AC and DC cabling design, cable thermal performance, protection studies, earthing design, equipment layouts and future infrastructure planning. Delivering safe, compliant and scalable MCS infrastructure requires specialist electrical engineering from the earliest stages of a project.