Last I heard HPEVS was recommending a max of 47 cells for use with the 144V Curtis controller to avoid driving cell voltage too high with regen. Of course you could just keep all 50 you have and charge them to a lower voltage to begin with. Not many choices for higher power isolated chargers. Elcon seems to be the best deal. I've been using a Manzanita for almost 4 years with no problems, but you do have to always remember it is non-isolated. The "diy" charger made by EMW that Corbin mentioned is also non-isolated.
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