Sailing Uma talked about this in one of their episodes.
The problem is that you have to energize an AC motor which requires some draw on the system. Until the prop is spinning fast enough to generate net energy, regen isn't doing anything but depleting your bank.
I think Dan had some crazy system where they ran the motor in reverse at a low draw to energize the motor and get the (folding) prop spinning, and then if the prop turned faster due to the motion of the boat through the water they'd get some regen. But I think they wrote the whole scheme off as not worth the effort.
(This was on their original forklift motor, not their current saildrive).
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