d8veh said:
A 20% hill is nothing for a 12T MAC with 48v and 25 amps. That video shows it on a 30% hill.
Why do it with 1500 watts when you can do it @ 500 for a crank drive ? unless of course you don't want to put effort into peddling.
I can't see a mac pulling 1500 watts at slow long climbs doing it all day compared to the crank drives. Though I would like to try it with a 12T.
I know you prefer even the bafang geared hubs to the Bosch but as I told you before the Bosch prefers a faster cadence to output maximum power, the torque sensing software must be designed so that when it senses a faster Candace it should mean you're going up a steep and so then should apply max power. And to be honest it works brilliantly.
I don't find gear crunching much of an issue, as soon as I stop peddling the motor turns off, I just back off the peddles a bit and change gear, not an issue and I haven't broken gears yet.
The Bafang should work better for those who want to put a lot less effort into cycling. And it is 750 watts V 500 for the Bosch. I believe the 750 Bafang has 90 Nm torque V the 2013 50 Nm Bosch ? The Bosch 2014 I think has 60 Nm torque.
I agree a geared hub is fine for most people but the crank drive will climb everywhere where as in my experience a hub won't. I find it amazing the Bosch will climb what a pie II @ 3kw could and not much slower, @ 500 watts and above all it was cool at the top and the Pie roasting. And the pie consumed much, much more power. This was 23% +, I must try find the actual grade I think it's steeper.
I think for the steepest of hills and slow steep trails the crank drive is the way to go, for normal riding normal hills and for higher speeds then the geared hub will do fine. I do find the crank drive much more efficient than the hub. I've never used such little power on my cycles with hubs on long cycles, but if you're happy enough to buy and carry around a bigger battery then I see no advantage to crank drive.
Another advantage with crank drives means you don't have to play with torque arms.