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The battery cables act like springs. They get stretched during on time then they "twang" back during flyback. The purpose of the dc link capacitors is to remove the peaks and troughs caused by this inductive action. This is why the connections from the link caps to the b+ and b- busbars must be as short and stout as possible. The controller then sees a much stronger voltage source.
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Now, Cole, when you shift the gear and that little needle on the ammeter goes into the red and reads 2000 Amps, that's bad.
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