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Three Phase Power Supply in the Home to Fast Charge Electric Vehicles - Safety Precautions to be Considered

John Beirne

For speed of charging an electric vehicle, homeowners are considering to install a three-phase power supply to charge their car up to 22Kw instead of up to 7Kw on single phase.  If this was the case, are there any safety precautions that need to be considered, by the homeowner, assuming that a power company would be supplying and connecting the three-phase power supply to a high-power electric vehicle charger?

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    Why do you need a transformer? there would not normally be one -  the car itself takes in either 1 phase at more or less 7kW, or 3 of them at more or less 7kW each to make the not quite 22kW the marketing folk like to claim. I'm not aware of a common car standard for 22kW from a single phase.

    The 'charger' that goes on the wall is just an automatic switch and some electronics to detect that a car is plugged in and switch the mains on, or that it is fully charged or unplugged and to switch off - there is no transforming going on.

    Mike.

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  • 0

    Why do you need a transformer? there would not normally be one -  the car itself takes in either 1 phase at more or less 7kW, or 3 of them at more or less 7kW each to make the not quite 22kW the marketing folk like to claim. I'm not aware of a common car standard for 22kW from a single phase.

    The 'charger' that goes on the wall is just an automatic switch and some electronics to detect that a car is plugged in and switch the mains on, or that it is fully charged or unplugged and to switch off - there is no transforming going on.

    Mike.

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