Agreed, especially considering there is zero data on what kind of cells, charge state, new/used, chemistry, brand, source, etc, etc, etc......
Altho, under the assumption that the OP is referring to standard lithium cells, 14s @ 57.4V would be 4.1V/cell, whereas 16s @ 64V would be 4.0V/cell. This little difference won't neccessarily increase the life cycle count by much. However from 4.2V to 4.1V would add a lot. Going down to 3.9V would also add a lot of cycles available. But you are also sacrificing capacity.
Another thing to consider more so is the type of inverter/charger that is being used. If it can handle 64V in the first place.
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