RE: parallel batteries
>As I understand it, lead acid batteries work okay being in parallel
>and NiMH don't work well in parallel.
Question for those who have more knowledge on this point... NiMH don't
parallel well, but what about having several strings that are
either higher or lower in voltage than the motor+controller
need, and a buck/boost bidirectional converter for each string,
dumping power into (or out of, in the case of regen) the main
'bus'. Say, 6 or 10 192 volt strings, with a 156 volt bus. Each
converter would need to be capable of maybe between 40 and 100 amps,
depending on your power level. Obviously, synchronizing them might
be a bit of effort, but could this work? I would think buck for
driving, boost for regen would make the most sense to me from an
efficiency and minimizing switching loss point of view. Obviously
the output capacitors on the bus would need to handle full ripple
current of the motor and controller.
>As I understand it, lead acid batteries work okay being in parallel
>and NiMH don't work well in parallel.
Question for those who have more knowledge on this point... NiMH don't
parallel well, but what about having several strings that are
either higher or lower in voltage than the motor+controller
need, and a buck/boost bidirectional converter for each string,
dumping power into (or out of, in the case of regen) the main
'bus'. Say, 6 or 10 192 volt strings, with a 156 volt bus. Each
converter would need to be capable of maybe between 40 and 100 amps,
depending on your power level. Obviously, synchronizing them might
be a bit of effort, but could this work? I would think buck for
driving, boost for regen would make the most sense to me from an
efficiency and minimizing switching loss point of view. Obviously
the output capacitors on the bus would need to handle full ripple
current of the motor and controller.