Quote:
Originally Posted by sportcoupe
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If you run all batteries in series for 72v your range will be half what it would be at 36v.
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When you change pack voltage, you have to work in Watt-Hours (Volts X Amp-Hours) rather than Amp-Hours.
Assuming the 36V and 72V motor/controller have the same efficiency and the cart weight and/or rolling resistance doesn't changed significantly,the cart will take about the same number of Watts to move it from Point-A to Point-B, so the run-time will be about the same with a 200AH 36V pack or a 100AH 72V pack.
The most common example of this is the common practice of upgrading from 36V (6 x 6V 225AH battery) to 48V (6 x 8V 170AH battery).
Both battery packs have roughly the same kWh of stored energy and the run-time stays about the same.