Wireless Charging

Wärtsilä has developed a wireless charging system for easy transfer of power from the shore to ship, replacing the traditional cable connection method. This technology is particularly suitable for fully electric vessels using batteries which spend little time at the dock, such as ferries for example. Using the Wireless Charger, power transfer can start the moment the vessel is docked rather than having to wait until cables are connected. This means that the same energy can be supplied to the vessel over a longer time, which reduces the total power rating of the shore connection system.

When combined with systems such as auto-docking and vacuum mooring then the process of docking and undocking becomes even more safe and efficient.

    Charger Concepts

    The wireless charger has a sending coil arrangement on-shore mounted on a hydraulic arm with y and z axis movement. The sending coil is connected to a nearby power electronic where grid connection and alternatively shore based energy storage can be connected. The input voltage to the power electronics is 690V 50/60Hz.

    On the ship side there is a similar coil arrangement where the receiving coil plate is mounted flush with the side of the vessel. The coil arrangement is connected to a rectifier for DC conversion.

    The basic principle is following:

    • Current in inductive sending coil creates a controlled magnetic field.
    • Magnetic field from sending coil creates a current in the receiving coil.
    • High frequency current flowing in the inductive coil is converted to DC Power.
    • Energy is stored in the ship batteries

    This system can transfer more than 2 MW with a distance between the coils of about 4- 500 mm.

    Key Benefits

    The Wärtsilä Wireless Charging System has the following benefits:

    Lifecycle cost

    • Low wear
    • Low maintenance
    • Low lifecycle cost

    Safety and availability

    • High safety
    • High availability
    • Excellent weather protection
    • No cable connections ship to shore
    • Encapsulated insulation, no creepage distances exposed to weather
    • No galvanic connection ship to shore
    • No consequences of relative movement ship vs shore
    • Immune to ice and snow
    • Prepared for de-icing


    • Prepared for autonomous operations

    Grid cost / landside battery cost

    • Low power/energy ratio –may avoid weak grids upgrading – may avoid shoreside battery
    • Active rectifiers stabilize grids
    • High charging time/docking time ratio


    • Low profile landside

    Press releases


    The evolution of wireless charging

    Power cords may soon be a thing of the past. Everything from mobile phones to coastal ferries can be...
    21 June 2017
    • Twentyfour7. article

    Hybrid technology for new emerging markets...

    The double ended car ferry ‘Folgefonn,’...
    7 July 2016
    • In Detail article

    Hybrid Tech Gets a Jolt of Sea Air

    WIRELESS POWER TECHNOLOGY and vacuum docking are the latest buzzwords in coastal shipping lanes, and...
    8 July 2016
    • Twentyfour7. article

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