best choice 48v 1000w Rear

[bosondehiggs]

hello im french and want to buy one hub 48v 1000w Rear.
What is the best choice between these two ebay offers?

http://cgi.ebay.fr/48v-1000w-Rear-Electric-Scooter-conversion-Kits-E-bike-/320737163429?pt=LH_DefaultDomain_0&hash=item4aad6cb8a5
http://cgi.ebay.fr/1000-W-48-V-Electric-Bicycle-Bike-Hub-Conversion-Kit-/390337843876?pt=Cycling_Parts_Accessories&hash=item5ae1f2d2a4

thanks

 

[miuan]

Welcome to ES! Please ask user cell_man to offer you a rear mxus DD kit. it's good quality, and can easily sustain 1000W on mild uphills. It will do about 40-45kph on flat. It's cheaper too, and the man knows his stuff, although he may be slow to respond at times.

 

[dogman dan]

Both pretty similar really. Nearly any dd ebike motor can do 1000 watts easily, and often are taken to much more with little modification besides larger wires to the hub to carry more power. Basicly, you determine the power with the voltage and amperage of the controller you choose. Most kits come with a maximum of a 22 amp 48v controller.

Cellman is trusted here, but shipping from china can be slow and / or expensive, for any of the choices. Sometimes people just choose based on shipping costs, and shipping time. Just depends on what you want, fast or cheap.

 

[miuan]

the 1st kit has a single wall rim, try to avoid it.
both ebay deals offer only basic slow shipping.
cellman's kit is cheaper even with fastest air shipping.
he also has 11-28T freewheel sprockets for pedaling at high speeds.

 

[bosondehiggs]

thank you for your answers i send him a PM.
this two offer are for express shipping.

 

[bosondehiggs]

What is the best choice for cellman's kit?
For cheap and good speed at 48v.
and compatible to 72v if possible.

thanks

 

[neptronix]

You wouldn't want to run 72v on a basic hub motor like these. That's Crystalyte 5xxx motor territory.
Do you really want to go 38-40mph on your first build?

At 48v, the cell_man DD kit on a 26" wheel will easily do 30mph or more.

 

[bosondehiggs]

72Vnot for beginning but I preferred a motor compatible with. if I just need to change the controller later it's not a problem.

 

[wesnewell]

Motors are rated in watts, so you can dump any voltage you want to one without doing damage. A 1000W motor is rated for 1000W continuous use. That could be at 50V 20A, 100V 10A, or any combination that doesn't exceed 1000W. Most motors will handle many times their rated value for shorter periods of time. Some may even take as much as 150% continuous. And some may break at 90% or less. I've pumped over 3KW into my 500W motor with no problems for short periods and over 4KW at 100V into my 48V 1000W motor.

 

[neptronix]

Here's the thing.
The higher the voltage, the higher the speed, and the higher the amps you will need to cruise at @ top speed.
That's why hub motors are rated in watts and you need to look at that.

Most hub motors will not do more than 2000 watts constant for any period of time.

72v on most hub motors will go anywhere from 30mph to 60mph.
The best question to ask here, is how fast do you want to go? if you want to go 40mph, well, not many hub motors will do that without having a meltdown, and you need something gnarly like the 24 pound crystalyte motors.

If you have a lot of hills, that means you need even *more* power. You then need a reserve of current handling ability when the extra torque is needed to overcome gravity

If you want a motor that handles everything, you need a 24 pound Crystalyte 5xxxx series motor..

 

[cell_man]

The 26" MXUS DD motors I sell are not as quick as 30mph at 48, maybe about 26/27mph. By my calcs (305rpm no load at 36V), a MXUS DD would produce a loaded speed of about 60kph (37mph) on 72V or fairly close to that figure. I'd say that is a bit more than that motor could run for extended periods, you'd need roughly 2000W continuous input power to maintain that sort of speed IME, but for blasts it should be fine if you keep the continuous power a bit more sensible. BUT, it's a 500W rated motor, and if you throw 3000W plus at it, please don't come crying to me if you melt it

 

[neptronix]

Ayyy; sorry i was just going off how it ran for me at 52v.
On lipo, you run at a bit higher voltage. And i am referring to the top part of the very slopey discharge curve.

My numbers are a best case scenario, so you're right, it is more like upper 20mph figure.

 

[dogman dan]

72v, but with a 20 amp controller is not such a bad compromise for many dd bike motors. At around 1500 watts, they have a better chance at going more or less continous without melting. You won't make the 40 mph club, but 30-35 mph is likely.

You'll never see it get real popular here though. 3000 watts is so much more a thrill. But best if it's a short thrill at that kind of watts on these motors.