HYBRID PROPULSION Q


Marine is integrating two Li-ion battery systems that will provide a combined 1,450kWh capacity at 1,011V alongside Bergen B33:45 engines. Safety and reliability are particularly important as Sir David Attenborough will operate in the remote and hostile seas around Antarctica. Saft was contracted to develop an advanced cooling system which would maintain an even temperature in the battery systems while operating in challenging conditions. The battery systems will deliver peak power


for dynamic positioning and help Sir David Attenborough push through ice packs of up to one metre thick and while towing research equipment. The batteries have been sized to enable the vessel to be self-sufficient in fuel over voyages of up to 19,000 nautical miles. In addition, the Li-ion batteries will help to reduce noise levels below the waterline,


It will feature a hybrid propulsion


system capable of long periods of silent propulsion and zero emissions. Benetti is fitting two battery systems with a total capacity of 3MWh as part of a power plant that includes six engines as well as ABB Azipod thrusters. It means that the captain will be able to turn to battery power for full electric propulsion or to use the batteries to boost engine power to enhance speed and manoeuvrability.


Zero emissions Fully electric propulsion systems are particularly attractive for their zero-emission operations. These rely entirely on batteries that are charged while berthed in port. A small generator provides back-up power if needed. One interesting example is the Ballerina


Seanergy batteries incorporate a super lithium-iron phosphate (SLFP) formula which delivers stable and reliable performance


modular systems that are tailored to closely match the power and voltage requirements. The high energy density of Li-ion technology


is particularly beneficial as it helps to create a compact battery system, which leaves plenty of space for passengers and other systems. Its wide temperature operating range is also


important within the marine environment, where batteries must be able to operate reliably in hot spaces or cold conditions. However, the most important factor in


battery selection is safety, as vessels must be self-sufficient in case an incident arises. Li-ion is an umbrella term that describes


Zoza’s hybrid system will be capable of silent propulsion and zero emissions


avoiding disruption to marine mammals, fish and survey equipment. Rolls-Royce Marine has also installed


Saft Li-ion technology on board OV Bøkford, a workboat for the Norwegian coastguard Kystverket, which entered operation in the summer of 2016. It features an 857kWh battery system which operates alongside a single diesel engine operating at peak efficiency – enabling reported fuel savings of up to 25%.


Superyacht technology The competitive world of superyachts is now the source of many maritime ‘firsts’. One recent example is the 100m-plus superyacht Zoza, currently under construction at the Benetti yard in Livorno, northern Italy, which will be the first of its kind when launched later this year.


ferry that serves foot and cycle passengers on a 50-minute commuter route through the waterways of Stockholm, Sweden. The vessel is constructed from lightweight composites and is fitted with a 500kWh Li-ion battery, which can accept a 95% charge within two hours, and achieves quiet zero-emissions operation throughout the year. Two sister ferries serving the city of


Bordeaux in France are also capable of fully electric or hybrid propulsion on the Garonne river – a UNESCO World Heritage Site.


Why Li-ion? Li-ion batteries have the advantages of high energy density, high efficiency, long calendar and cycling life, fast-charge capability and high power output. They can also be built into


several types of electrochemistry. The electrochemistry used in mobile phones and laptops is quite distinct from the Li-ion technology on board ships and aircraft, and in offshore facilities where safety is paramount. Saft has developed its own Li-ion formula


called super lithium-iron phosphate (SLFP), which delivers stable and reliable performance over a wide temperature range, has high tolerance to electrical and mechanical abuse, and has a high level of safety. SLFP is central to the design of Saft’s Seanergy modules, which have been designed specifically for the maritime sector. SLFP has also been adopted for other battery systems for aviation, oil and gas, and data centres, which all demand the highest safety standards. Seanergy batteries have achieved safety


approval from Bureau Veritas, Lloyd’s Register and DNV GL. They have also been approved by the Norwegian Maritime Authority, which demonstrated their safety performance by using a device that tested ‘thermal runaway’ and found that the Seanergy modules contained thermal runaway inside individual cells, thereby keeping other cells safe.


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