48v Motor Kit?

[mybike]

I see that geared hub motors have plastic gears inside that can be damaged (plastic! :| ) and direct drives motors don’t (I think that’s what there called).

I was looking at these hub motor kit on ebay 48v 1000w
http://www.ebay.co.uk/itm/New-26-48V-1000W-Electric-Bicycle-E-Bike-Conversion-Kit-Rear-Wheel-Hub-Motor-/190918732542?pt=UK_SportGoods_CyclAcces_RL&hash=item2c73a4aafe

1. Is it any good?
2. Can these motors be over volted to 60v using SLA battery’s with out any problems?
3. What will likely happen to this motor if I ran it on 72v (is it capable of 72v).

 

[kentlim26]

48v controller cannot use more then 60v, stay at 14cells or 12cells lipo. controller can be upgrade higher power to 15cells or 20cells. the 48v 1000w im using n running till today more 8000km, i lost count them. most of the time my road are flat or mild slop, so no problem. i like it this 48v 1000w very much. my future plans is 12cells 20amps. at 17 cells fully charged battery lipo will give speed at least 63kmh. however most bicycle i see, will be better to stay speed 55kmh at most.so u can feel alot safer and more confident riding= everytime!

well , you will still have a goal speed you wish to reach or maintain them. you must say your choice top speed.so more people will help yoi.

 

[wesnewell]

Most 48V controllers have 63V caps which limits the battery pack for them at 63V without going over spec. A 60V sla pack will charge to 68V and will likely blow the caps and controller.

 

[dogman dan]

Exactly, so you need to get a new controller to run that motor on more than 4 12v sla's.

The motor itself can tolerate 1500w easily. So a 72v 20 amps controller is no problem for it at all. No gears in there, but running them past 1500w can heat them up enough to cause problems.

Many of us run them on 72v 40 amps. If you do that, and run them for too long a ride, you definitely can melt the motor. But as long as you are using slas for the battery, you will never have that problem. You will run out of battery just before the motor gets hot enough to melt. At 3000w, you need to keep the rides to less than 10 miles if you ride full throttle. By 15 miles, enough heat builds up to potentially damage the motor.

So pick a 72v controller, and go for it. 72v 40 amps might get you 40 mph. For sure 35.

I ran 110 v through a similar motor. Fun and very fast, but the overheating was very quick. 4000w was just waaaay beyond what that size motor can take.

 

[mybike]

Nice! That’s a project I will be working on soon… after fixing and a respray of my Cyclamatic Plus ebike.

 

[dogman dan]

If you go to 72v 40 amps, be sure that melted motors are in your budget. Get them cheap enough and you can afford to melt one a year easy enough.

Buy a more expensive bigger motor asap if you plan on riding 40 mph all the time.