What do we propose to do? BEB battery lifespan is affected by multiple factors such as cycling and resting duty cycles, charging strategy, and environmental conditions . The same battery pack will have dramatically different expected life in different regions, and for different usage cycles Today, BEB bus test program gives an estimated range (related to battery capacity, which is one measure of its state of health) based on very limited measurements on a chassis dynamometer, at the beginning of battery life . There is no consideration of aging and degradation in these certification tests. There is an opportunity ( one might argue a need ) to inform Transit Agencies as to the progression of life in BEB batteries so that BEB operation, including charging, route deployment and other operational factors, can be optimized to maximize battery life, and therefore reduce fleet battery replacement costs. Our aim is to develop a tool for fleet operators to track and monitor battery health , predict remaining useful life of BEB batteries, and provide best practices for Transit Agencies with respect to battery charging and deployment strategies.
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