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common ground dc-dc

  1. if you make 12V supply in a EV do you make it to it have common ground?

    Technical Discussion
    If you install a 12V supply (for car's lights, radio, etc) in a EV through a switched-mode DC-to-DC converter from the main EV big battery pack, do you make the 12V installation negative (ground) and the (for example 144V) installation negative both connected to the car chassis, i.e. share a...
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