Portuguese Navy two Thyssen Krupp Marine Systems AG U209PN AIP (Air Independent Propulsion) powered submarines built by German companies Howaldtswerke Deutsche Werft GmbH and TKMS Blohm + Voss Nord-seewerke GmbH are powered by two MTU Friedrichshafen GmbH 396SE 16V 84GB31L and a single Siemens  AG Sinavy CIS Permasyn propulsion motor coupled to two PEM fuel cells.

The propulsion system is controlled from the submarine navigation room by the Siemens Marine Solutions  Sinavy SUB integrated management system.

Around 300 batteries from Systems Sunlight SA are installed in the boats.

(courtesy of http://pedromonteiro-photography.blogspot.com).

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