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Silly article. Maybe current prototype systems consume 2-4 kW since the focus is on proof of concept and not efficiency. The production versions will be much more power efficient. Just think of the processing power in a phone, which consumes just a couple watts.
Automakers don't seem to be that concerned with electrical efficiency. Just look at how common wasteful resistors are to control blower motor speed. Those can burn 100 watts alone.
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