Reliability of Open Public Electric Vehicle Direct Current Fast Chargers

In order to achieve a rapid transition electric vehicle driving, highly reliable and easy use charging infrastructure is critical building confidence as consumers shift from using familiar gas vehicles unfamiliar (EV). This study evaluated the functionality of system for 657 EVSE (electric service equipment) CCS connectors (combined system) on all 181 open, public DCFC (direct current fast chargers) stations in Greater Bay Area. An was functional if it charged an EV 2 minutes or at time station evaluated. Overall, 72.5% EVSEs were functional. The cable too short reach inlet 4.9% EVSEs. Causes 22.7% that non-functioning unresponsive unavailable screens, payment failures, charge initiation network broken connectors. A random evaluation 10% EVSEs, approximately 8 days after first evaluation, demonstrated no overall change functionality. level appears conflict with 95 98% uptime reported by providers (EVSPs) who operate stations. findings suggest need shared, precise definitions calculations reliability, uptime, downtime, excluded time, applied open DCFCs, verification third-party evaluation.