36V 250W amp draw ? !

[oded]

I have two E-bikes, both with 36V 250W front hub motor -

1. the freedonebikes kit http://www.freedomebikes.com/ on my wife's 700 wheel (Jamis Citizen). running on 10S lipo and rpoviding nice thrust with about 12 amps max draw.

2. Conhis motor front wheel 26 kit from here - http://www.aliexpress.com/product-fm/444159971-Free-Shipping-Wholesale-36V-250W-Front-Wheel-Conversion-Kits-DIY-Ebikes-Electric-Bicycle-Conversion-Kits-wholesalers.html (recommended).
installed it yesterday with a 10S lipo pack and noticed 18 amp max draw with about the same performance as my wife's bike.

what kind of amp draw should I expect from these kits and why is there such a difference between them ?

Thanks.

 

[motomech]

I have two E-bikes, both with 36V 250W front hub motor -

1. the freedonebikes kit http://www.freedomebikes.com/ on my wife's 700 wheel (Jamis Citizen). running on 10S lipo and rpoviding nice thrust with about 12 amps max draw.

2. Conhis motor front wheel 26 kit from here - http://www.aliexpress.com/product-fm/444159971-Free-Shipping-Wholesale-36V-250W-Front-Wheel-Conversion-Kits-DIY-Ebikes-Electric-Bicycle-Conversion-Kits-wholesalers.html (recommended).
installed it yesterday with a 10S lipo pack and noticed 18 amp max draw with about the same performance as my wife's bike.

what kind of amp draw should I expect from these kits and why is there such a difference between them ?

Thanks.

what kind of amp draw should I expect from these kits and why is there such a difference between them ?

Between 12 and 15 Amps. I think they might be both the same bafang motor, so perhaps for that second kit, they sent you a controller from a 350 Watt kit.
Do you weigh more than her? That could account for the equal performance
!8 amps is pushing it for the sm. guage wires those kits come with, but at 10S, you should be fine.
At any rate, you need not worry about it, just enjoy.
Besides, 18 Amps is more manly :lol:

Boy, is that Freedomebike site full of BS, or what!

 

[dogman dan]

Same if the controllers are set to the same amps. Otherwise, the higher amp one will run more amps. 250w eh? At 36v that's less than 10 amps controllers.

What they actually are will vary, but because of stupid laws in some parts of the world, lots of stuff gets labeled 250w. 15 amps is more likely, or within a few amps of 15.

Either motor could tolerate 20 amps. But not a lot of point in it unless you have very steep hills to climb.

 

[oded]

Thanks for the info.

since I am quite new at the e-bike world (electric RC planes & Helis so far), wanted to know if the difference between the 36V 250W and 350W for example, is the current rating of the controller, or is it a different motor altogether ?

 

[motomech]

For the motors we are talking about, the controller.

 

[dogman dan]

There can be differences, but mostly those motors can do a range from 200w to about 800w with ease. Some motors will be wound to have differing top speeds.

Bottom line though, the contoller determines a lot of the equation, volts from the battery + amps the controller allows = max potential wattage.

Actual wattage depends on the load on the motor, and the throttle setting. One reason we like the cyclananyst and other wattmeters so much, is you start learning what is going in in real world conditions. Then you can ride to your desires, max efficiency or max power, and know what is being done to your battery.

 

[d8veh]

As far as I can see, the motors are completely different: the first looks like a Bafang geared hub motor and the second is direct drive Conhismotor. If that's right, the geared motor will have more torque of the line and better climbing torque at the same current, but you have different controllers that provide different currents, so the lower current hub motor will feel similar torque to the direct drive motor at higher current. At low speed, the difference would maybe show more in efficiency rather than power so that the geared motor won't drain your battery as fast as the direct drive one, but at higher speed there would be less difference in efficiency.