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I get the idea of a second alternator, but if you're going to the effort of adding a second alternator, you might as well put a compact motor (think etek/mars/motenergy) on it instead, with a small 48v lithium pack (a123 20ah, for example) and do some actual regen as a small hybrid. You could then just bleed off the 48v pack to top up the 12v battery, and have a few "free" KW of extra power on-tap.
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