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SunLine Transit Agency Advanced Technology Fuel Cell Bus Evaluation: Fourth Results Report
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    SunLine Transit Agency provides public transit services to the Coachella Valley area of California. SunLine has demonstrated hydrogen and fuel cell bus technologies for more than 10 years. In May 2010, SunLine began demonstrating the advanced technology (AT) fuel cell bus. The AT fuel cell bus has a hybrid electric propulsion system based on the Siemens ELFA system, integrated by Bluways with Ballard’s FCvelocity HD6 fuel cell power system, and lithium-based hybrid batteries from Valence. The design incorporates the latest improvements to reduce weight and increase reliability and performance. This report describes operations at SunLine for the AT fuel cell bus and five compressed natural gas (CNG) buses. Since it first went into service in May 2010, the fuel cell bus has driven more than 48,000 miles and has accumulated more than 3,600 fuel cell system hours (for an average operating speed of 12.3 mph). Problems encountered during the demonstration include some air conditioning issues during the hot desert summer, fuel cell power system issues, traction battery issues, and bus body work. The U.S. Department of Energy’s (DOE) National Renewable Energy Laboratory (NREL) is working with SunLine to evaluate the bus in real-world service to document the results and help determine the progress toward technology readiness. NREL uses a standard data-collection and analysis protocol originally developed for DOE heavy-duty vehicle evaluations. NREL has previously published three reports documenting the operation of the fuel cell bus in service. This report provides a summary of the results with a focus on the bus operation from February 2012 through November 2012. Table ES-1 provides a summary of results for several categories of data presented in this report. The table includes summary data collected on all of the buses in service as well as summary data from only the most recent evaluation period, which is the focus of the report.

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