EVSE Fast Charging Network: Challenges for Calibration and Traceability

EVSE Fast Charging Network: Challenges for Calibration and Traceability

The new year 2023 brings accelerated expansion of a nationwide network of electric vehicle supply equipment (EVSE), supported by the U.S. Department of Energy and the U.S. Department of Transportation Joint Office of Energy and Transportation through the $5 billion National Electric Vehicle Infrastructure (NEVI) Program as part of the Bipartisan Infrastructure Law (BIL). All aspects of metrology – legal, scientific, and applied/industrial – support reliable equipment operation, daily customer usage, and state testing and evaluation of EVSEs that are critical to build a reliable and trustworthy EV charging network across the US. 


An ambitious goal has been set to build a nationwide network of 500,000 electric vehicle (EV) chargers to help expand infrastructure for zero-emission transportation. A significant portion of the funding is to support the deployment of convenient, direct current (DC) fast charging stations to be installed within communities, working and shopping areas, and along highway corridors to facilitate long-distance travel. Given this recent (and projected) rise in the number of DC fast chargers for EVs, there is now a need for NIST to develop and provide DC power calibrations at high voltage and high current for our stakeholders and customers. This will supplement the NIST calibrations for test standards and equipment currently used to test alternating current (AC) charging systems.


The International System of Units (SI) defines the measurement of electrical quantities in terms of fundamental physical constants that are linked to convenient instrument standards for voltage, resistance, and time. NIST has been researching DC electrical power systems designed for direct traceability to primary electrical standards, thus focusing on  intrinsic low current and low voltage measurements at the quantum level— ..

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