An on-board energy storage system for catenary free operation of a tram is investigated, using a Lithium Titanate Oxide (LTO) battery system. The battery unit is charged by trackside power supplies on approach to the stations, while at rest, and leaving the stations and also by regenerative braking energy. The power and energy capacity of the battery unit are specified. It was found that a 13 km journey can be achieved with a maximum depth of discharge of 15% with a battery capacity of 80Ah with a rated voltage of 495V giving a lifetime of 12 years.
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