It’s coming in a day
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Tho if we’re talking regen, the transient spike will come strong from the motor suddenly acting as an “inverted” generator to recharge the battery?
Doesn’t matter how big the battery is, a fast spike will first flow through the ESC before it’s dampened by the battery (I guess more noise or inductance might effectively happen, as you say, if it’s a small battery taking the beating).
So there’s still a risk thus need to spec with some margin above the fully charged operating voltage IMHO.
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