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Will wireless charging ever be an option for EVs?

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  • 05-10-2015 12:04am
    #1
    NIMAN
    Registered Users Posts: 33,358 ✭✭✭✭


    Like it is for small devices like phones?

    Will there come a time we just drive our EV into the garage and it charges wirelessly from a separate source?


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    #2
    cros13
    Registered Users Posts: 3,284 ✭✭✭cros13


    It probably will.

    Qualcomm has induction EV charging technology on trial with nissan and BMW.

    It has its downsides though:

    There is an automatic power loss of about 10% in ideal conditions.
    Alignment between the coil in the car and the charging coil needs to be fairly precise and efficiency suffers if it's not.
    Distance between the coils needs to be minimised, which will probably mean either the charging coil needs to be raised above the surface (which opens it up to damage) or the coil in the car needs to be lowered (requiring more mechanical complexity). The 90% efficiency number assumes only a few mm of clearance between the two coils.
    There is a maximum power delivery of 11kW on the systems currently being tested. In fact most of the systems being tested are in the 3kW range.
    It will never be an option of rapid charging.

    I think it maybe has a future with on-street charging and charging in shared car parks, where the coil can be embedded below the car space. But for home use conductive connectors are less hassle and more efficient. Rapid charging will use conductive connectors for the foreseeable future.


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