100 kms. Not even close. 25kms nahh not enough range. 38 kms Hmmm a little closer.
Maintaining a constant 60km/h would require around 1500 watts. If the motor was 70% efficient, you would need to supply 2150 watts to the motor in order to achieve the required output.
2150 watts / 96 Volts = 22.4 Amps.
12Ah at 22.4Amps = 32 minutes.
Now you also need to take into account the fact that most 12Ah lead acid batteries are not able to supply 12 Amps continuous for 1 Hour.
They are rated 12.0Ah @ 20hr-rate to 1.75V per cell @ 25°C (77°F), meaning it
should supply 1/20 of its rating
(0.6Amp) for 20 hours continuous if you're very lucky!
One battery that does not perform well at a 1C discharge rate is the portable sealed lead-acid. To obtain a reasonably good capacity reading, manufacturers commonly rate these batteries at 0.05C or 20 hour discharge. Even at this slow discharge rate, a 100% capacity is hard to attain. To compensate for different readings at various discharge currents, manufacturers offer a capacity offset. Applying the offset to correct the capacity readout does not improve battery performance; it merely adjusts the capacity calculation if discharged at a higher or lower C-rate than specified.
If it was discharged at a steady 12Amps, it would reach the Low Voltage Cutoff point
(10.5V/battery) in less than 35 minutes
(see attached graph), never mind 60 minutes!
If it was discharged at a steady 22.4Amps, I would anticipate it lasting 20-25 minutes maximum if you were lucky, which is why I estimated 20-25km range.
A 12Ah lithium battery with a continuous 2C rating (24Amp) should be able to supply 22.4Amps for just over 32 minutes
(32km range @ 60km/h).
Upon reflection, I think my estimated 20-25km range for a 96V 12Ah lead acid battery pack, is probably far too generous.
Alan
