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With regenerative braking you can't over charge your batteries unless you start out at the top of a large hill with a charged battery so making a 3 phase motor controller have regenerative braking means that you have a rectifier and some crude way to throttle it, and the input voltage is going to be pretty well matched to the battery pack because it's coming back from the motor that the pack was designed to run, it's also seeing just a fraction of the power that the regular speed controller would ever see as well.
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