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That the Sevcon has 90% eff for regen may be, but that is not the efficiency of the whole system. Brake regen is reclaiming some portion of energy already expended in getting up to speed that would otherwise be completely wasted- a good thing generally, but some of us have habits and conditions that allow such gentle braking that the penalty for paying for and carrying around the regen equipment is greater than the payback.
I think it is safe to say that your best bet to keep the batt pack charged is via plugging it into a wall outlet- money-wise, fuel efficiency-wise, emissions-wise, all that.
Oh- "spec'd" is short for "specified".
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