someplace to start:
Quote:
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Miles = BatteryType x Weight. For each mile of range, a particular EV might need 5 pounds of lead-acid batteries, 4 pounds of nicads, 3 pounds of nimh, or 2 pounds of lithiums. Pick your battery type, and you know how many pounds of them you need for a given range. (source)
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i want to go sub 20 miles, and lead-acid is least expensive, so i'm looking at roughly 100 lbs for batts. that seems low.
45 lbs: weight of my 75 amp-hour deep cycle lead acid 12v battery from my boat (kept in the basement in the winter for maintenance charging)
180 lbs of that battery type makes 48v.
however, the formula may be for a different (lighter) type of battery.