Chinese motor ? 36v 500w ? enough for 30km/h

[alexis57]

Hi,
I would like to know if a Chinese motor (for experimentation) is enough to go to 30km/h ?
I think the bike will be a 29". (but not sure maybe a 26")

I chose 36v to be able to get more current then more torque. I want a fast acceleration and a big torque for hills. (without pedal or really a little)
But maybe I should chose 48v 500w or a 36v 1000w.

Could you tell me, YOU who have one of these kind of motors.

Thank you !

 

[Dauntless]

How much do you weigh? I'm 200 pounds and 500w motors have not worked out for me when I've wanted to top 12mph or go uphill. 750w has been better but not good enough. Haven't had 1000w yet but it's time. This is with brushed motors and the cheap controllers. You might do better with a 500w brushed.

 

[Nobuo]

What controller are you going to push the each motor? a 1000W motor runs usually better on 48V and you will need proportionally less current for the same speed wanted as with 36V. Also the battery BMS should not be limited to less than 15A continuous

 

[alexis57]

I'm 60Kg / 130pounds.

I don't know yet the controller, I would like one where I can choose the limit current. (why not with many modes, like just assist or full power, I think I'll need just to limit the throttle)

The battery pack will be LG HE2 or Samsung 25R then I think I'll take a 30A controller for a 48V 1000w. And the bms will be 30-40A for 13s.

If I well understood, I can choose a 1000W and a controller 48v 30A (I think it's input current, from the battery, right?) and just limit it by the throttle to 500W.

 

[d8veh]

The 500w Bafang will give you what you want. You need a code 14 at 48v or a code 11 at 36v for approximately 260 BPM.

You can get a really nice kit from BMSBattery that makes a very neat installation using their 11.6Ah 48v 09 bottle battery with included 20A sine-wave controller and LCD. Installation was very simple. The only extra thing I had to do was splice a nine-pin connector on to the motor cable to match the one on the controller.

Here's one I recently built with that kit. Top speed is about 34km/h. It has very good acceleration and climbing power, even with a 100kg rider. You could use the 36v version with their S12S controller, but then you have to find a place to put the controller:

 

[dogman dan]

A 36v 20 amps controller should take most bike hubmotors to 30 kph. Depends on the wind of the motor, but typically that's the case. 700 watts or so, takes about 400 to cruise that speed if you are pedaling moderately. More of course, with any wind, any hill.

But you say you want big torque, for hills? Go 48v, and get a larger gear motor such as you see in the picture above. Then a 22-25 amps controller, and you will have about 1000w, perky take off, decent performance on hills. Don't go bigger than 30 amps controller with the geared motors.

BTW, the motor may be rated to 500w, but it can take about triple that ok enough, double it no problems at all. So its a 500w system with 48v 10 amps, 1000w with 48v 20 amps, 1500w with 48v 30 amps.