The Turanor uses energy harnessed from more than 500 sq m of solar panels to drive two, 60kW electric engines, each in turn driving a standard propeller. They are capable of pushing the 35m catamaran to a top speed of 14 knots (26km/h, 16mph).
But, on its journey around the world, the boat averaged just five knots only as she took a course around the equator to maximise exposure to the sun. The boat was at sea for 585 days as a result - compared to the record 45 days for sailing round the world.
To boost power when the sun is weak or hiding, the boat holds eight tonnes of lithium ion batteries, capable of powering the vessel for three days when dark clouds shade the ocean skies.
The boat reached London on 9 September 2013
http://www.bbc.co.uk/news/business-23936775
http://edition.cnn.com/2013/09/09/sport/worlds-largest-solar-powered-boat/index.html
http://interestingengineering.com/worlds-largest-solar-powerd-ship/
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