The challenge: Reliability in extreme conditions Designed for a round trip that will carry passengers between stops on a 50-minute route over the waterways of Stockholm, the ferry needs to be available throughout the year, completing eight round trips every day. The battery system to meet this duty needs to store a total of 500 kWh for propulsion, hotel loads and communication systems as well as powering on-board winches and pumps. It also needs to be suited to fast charging at two brief stops during the day as well as a full charge overnight. Reliable and effective operation is also essential in the extremely low temperatures of the Stockholm winter. Ferry operator Ballerina has ordered Seanergy ® Super-Iron Phosphate ® lithium-ion battery systems to save fuel and improve its environm

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