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Do you need the clutch or can you disable the alternator by disconnecting the field windings?
If you are using a capacitor as a buffer can you use a 24V alternator? Many alternators have 24V and 12V variants within the same basic design. Capacitor charge storage is increased with increased voltage.
Check the power requirements. There is only brief period available for energy recapture. To make it effective the power requirement is likely to be quite high. Higher voltage will help the current requirement. A capacitor bank is likely to be more effective than a chemical cell battery where power requirement, in and out, is the important criteria.
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