Secret of panasonic hub climbing power

[Gringo]

Crank drives have the great advantage of being able to run the motor at or near its peak efficiency.........
That's true, but nobody rides them like that so you get the same efficiency as hub-motors.

A sweeping statement there
I ride at my most efficient cadence and change gear to keep it there, that's close to my motors optimum rpm.
This is not by design more a fortunate coincidence, my arthritis means I can't peddle slow & hard so after many years my legs now work best at around 70 rpm, fast & light.
I'm getting around 75 miles per charge

 

[tongxinpete]

Dave, could I ask what code & voltage your mate's Bafang BPM 500w is.
I have been running the Q100 std (24'' rear wheel) on 36v LiPo4, & have left the Tongxin 175rpm in the front just to be called on to assist up the steepest hills. Very little pedaling is needed unless you wish. If I was building from scratch I would try & recreate this set up with a code 15 36v Bafang BPM I think. Otherwise the Xionda is an option as it could be run from a smaller cheaper battery, but I suspect the Bafang the best allrounder (I might be assembling for a mate & question which way to go). Ebiking just could not get better as far as I am concerned - some tough hills round here

I have also married a KU60 to a Golden HBM 36 direct hub motor (20'' front wheel). Interestingly joining the 12mph speed limit wires in the KU60 still give full torque & amps when needed (not so if doing this on a Con61 & Q100) Above is girlfriend bike, Sturmey 3sp in rear
I also run a TGA crank drive I was given, same type bike, different drive system, huge disappointment, forever breaking down - stripping frewheels etc, would only reccomend if you cannot pedal at all. If you are happy @ 15mph on the cycleways then a well chosen hub motor is for me every time
Very pleased with home assembled LiPo4 now it is working, can swap it between bikes as needed.

 

[Deleted member 4366]

Saneagle's BPM is 48v code 10 run at 36v and a KU93 controller at 30 amps. It does about 24 mph and has a lot of torque. We had to reinforce the main tracks on the PCB and solder the shunt to get it run at that current. On that 31% climb, he was going slowly to keep down with me. The continuous high current melted the phase wires between the PCB and motor connectors, but the controller was OK. We got it home by separating the molten mass and kept the wires apart with a glove or something.

If you have a hard-tail bike, it'd difficult to beat the BPM/CST motors. Instead of the KU series controllers, you want one of the S series so that you have complete control of the power for pedalling via the LCD.

The Xiongda can climb nearly as well if you increase the controller's current from 15A to 20A, but you have to go right down to bottom gear on your smallest chainwheel. It's nowhere as simple and convenient as the BPM, although it's lighter and you can use cheaper batteries.

 

[amigafan2003]

The Panasonic hub drive pulls over 1000 watts, that's why it climbs so well

 

[1boris]

You now this for sure? If it has a 48v 20 amp+ controller that would explain it.But it also have a very good range.That doesent make sense

 

[tongxinpete]

Thanks d8veh, I would be nom 36v & 15Ah if I went down the bafang route,
My four bikes can be seen here if anyone interested http://endless-sphere.com/forums/viewtopic.php?f=6&t=63308&p=947204#p947204