Abstract:A highly reliable and easy-to-use network of corridor charging stations is necessary for building driver confidence in using battery electric vehicle (BEVs) for long distance trips. This research is an exploratory study to understand the prevalence of no-charge events and the true reliability of corridor DC fast chargers. We propose an overarching framework to understand the reliability of charging stations from the users' perspective and identify many levels and stages of charging failures. Here we propose a new methodology to measure charging station reliability using charging data from corridor charging stations. We distinguish charging failures from recorded charging attempts where issues were successfully resolved and where drivers did not resolve reliability issues. We categorize “point failures” that can prevent drivers from successfully charging their BEVs using DC fast chargers when such chargers are considered to be “online”. Such issues could be stemming from communication failures between the charger and the vehicle, connector/ cable damages, electrical leakages, equipment errors, or errors from the vehicle side. We aim to understand how deep the problem is from the users’ perspective.