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Originally Posted by Gdeaver
With power off, the intrinsic diodes in the FET take the current. They do have a voltage drop and will generate heat. Short term they sould be fine but if you pushed the robot fast for a long time?
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We pushed our robot across a parking lot once. It got to the point that it smelled like burning electronics. On powerup, however, it still worked fine. Not that I advise doing it...
On a side note, the back EMF turns the fans on, but I doubt they're going fast enough to do very much.