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Hi Crashy.
Electric and hybrid cars must use something like this now for regeneration. I assume they use active rectification (?) I think we will see this soon in conventional cars too. Auto makers are always looking for lower production costs and higher performance, including better efficiency. I assume it will look like an alternator with internal electronics. Probably operate at a few hundred volts, with a buck converter down to 12. Or 48 if that "standard" ever gets adopted.
I don't think we'll see lithium batteries as the 12 volt source until their low temperature performance and cost are better than lead.
-mort
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