[brian_]

watt hour per mile= 96Vx (65ah/74.5mph)= 83.75.
96v x 100ah=9600w

So close - just a couple of typos:

watt hour per mile = 96 V x (65 A / 74.5mph) = 83.75 Wh/mile
96 V x 100 Ah = 9600 Wh (or 9.6 kWh or 34.6 MJ)

You just had the time component (hours) misplaced in both expressions, but the logic and the result are correct (if the input values are correct).

 

[brian_]

Now for whether the values are correct...

2) how do you eyeball calculate the range for a 26s30p? as you said the range depends on the Watt hour of the battery and the motor. In my case the motor peaks power at 4200w and peaks current at 65A..top speed 74.5 miles an hour (with load). i found this formula on the web and did it based on this setup:

watt hour per mile= 96Vx (65ah/74.5mph) ....

If the motor is getting 65 amps at 96 volts, that's 6240 watts, not 4200 watts... so something is not right. Perhaps you are looking at current to the motor from the controller, but voltage to the controller from the battery? Perhaps the 4200 watts is output power and the motor is only 4200/6240 = 67% efficient when producing this peak output?