>> 9Ah*300V = 2700Wh
>>
>I guess.  How does one CHARGE 250 series connected NiMH cells?
>Sounds either complicated or less than ideal.

Boost converter or separate excitation on the motor/generator. The latter
is most likely. To turn the motor into a charger simply manipulate the
excitation winding. It would be interesting to know how long that battery
lasts (months ?).

Peter

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