My pedal assist ebike is around 11wh/mile. My all-electric moped/scooter is more like 25wh/mile.
From another forum:
Quote:
30-32 Wh on Cyclone 6kW eTrike at 28 mph average speed.
46-48 Wh on Cyclone 3kW eBike at 30 mph average speed.
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So it all comes down to air(speed) and rolling resistance. I'd calculate for ~50wh/mile, though it will probably be worse running at 40mph.
As to pack size, I'd recommend running at "1C" or better to minimize strain and maximize range and battery life. 40mph x 50wh/mile = 2000 watt-hours, divided by 48v = ~42 amp-hours. That will theoretically get you an hour's run time going full out. Not sure if 2000w will get you to 40mph though. That's probably what a 1500w motor will actually draw from the battery.
Yes, you can run more that 1C (1x the capacity of the battery), if you have decent cells. Brand name power tool cells(high drain) can theoretically sustain 10C or more. I wouldn't want to run a cell at it's limit until it was drained over and over, mind you. Most people want to ride for more than 6 minutes at a time, mind you.
Bla bla bla...should be enough info there to get you started.
