No problem, I think we were getting our wires crossed there (pun intended) in post 46 in response to my "will my thumb throttle still work question" you said:

 

"No, it's a torque sensor.

There is no wire if you have an on/off switch on the battery."

 

It was the "if" that threw me, I thought you were saying that if the battery doesn't have an On/Off switch then I would need an LCD which would also give the option to have a throttle!

So back to the KT controller then, can anyone smarter than me confirm that that these are the parts I need:

 

1. Battery - https://www.dhgate.com/product/e-bi...7-5ah/425500276.html#s1-2-1b;searl|0829082575

 

2. Controller - https://www.aliexpress.com/item/36V...688.html?spm=a2g0s.8937460.0.0.29e02e0e3WNCsJ

 

3. LCD - https://www.ebay.co.uk/itm/KT-Lcd3-Lcd-Display-for-Electric-Bike-24V-36V-48V-60V-72V-Intelligent-LCD-Panel/253946404446?hash=item3b20629e5e:m:mJGZNHD-uGB2zSd4GU3bcZg:rk:1:pf:1&frcectupt=true

 

The LCD comes with a long plug but looking at the diagram it looks as though it has a Julet connecter on the end of a short lead similar to my current LCD.

you need a 6-FET 48V controller with normal JST connectors - the one you selected is too big to go inside the controller box.

That way, you can re-use the existing pedal sensor, throttle, brake sensors on the hydraulic brakes and cabling.

I think Woosh is suggesting this type controller, so I assume your existing one dosn't have Julet connectors. Maybe he could confirm this.

https://www.aliexpress.com/item/36V-48V-500W-Brushless-DC-Sine-Wave-sensor-Controller-ebike-Electric-Bicycle-Hub-Motor-Controller-with/32759790640.html?spm=a2g0s.8937460.0.0.1b092e0eDTka2q

Hi - I am replacing a large 500w heavy rear motor with the BAFANG SWX02 cassette version. "RM G020.250.DC 09" "007F2T7230672" It is a road bike (conversion of a touring bike) and I only need 250w/350W. My battery is 17ah 36V, controller 11W, and the LCD is

KT LCD 1 eBike Special Meter. I just put the new motor on and it works but it is sensing the wrong speed which appears far too high. The motor now restricts at far to low "real" speed. I believe I need to reprogram the P settings. But I dont know what to use.

P1 is motor characteristic parameter setting mode. presently P1 = 46

P2 Wheel Speed Pulse Signal Setting Mode P2 is set to 0

P3 Power Assist Control Mode P3 is set to 1

P4 Handlebar Startup Mode P4 is set to 0

P5 Power Monitoring Mode P5 is set to 12

My LCD shows a P6 parameter of 45 however the KT LCD1 manual I have does not indicate there should be one.

 

I suspect I should alter maybe P1 or P2 but not sure what to set? Can anyone help?

Thanks Dave

P1 84 should cut out at about 15.7mph with 25km/h set in the speed setting, if so P1 calibration is about spot on and you can then set speed higher if you like knowing it is pretty accurate.

P2 1 or if it doesn't read free wheeling P2 6.

 

P6 is a special mode for the cylotricity D/D hub only, it changes the 250w to 500w.

Edited November 13, 20196 yr by Nealh

I'm pretty sure that the SWX02 has 6 magnets for the speed sensor, so P2 should be set to 6. That's your problem with the speed reading.

Thanks people! Perfect P1=20pole x 5 = 100; P2=6 and the P6 I assume to be 99=500w 46=250w so set to 65 to approximate 350w. The new motor allows me to keep the 10speed shimano cassette. I also have retained the deore trecking crank.

Thanks people! Perfect P1=20pole x 5 = 100; P2=6 and the P6 I assume to be 99=500w 46=250w so set to 65 to approximate 350w. The new motor allows me to keep the 10speed shimano cassette. I also have retained the deore trecking crank.

There is no P6. Where did you get that from?

There is no P6. Where did you get that from?

 

It is a custom Cyclotricity Mod to the controller they supply for a 250/500 motor controller. P6=46 gives 250 legal wattage P6=99 gives the full 500 watt.

There's no such thing as legal wattage. There's no regulation on it other than your bike mustn't burn out. You might as well set it to maximum and use the normal levels on the LCD to regulate the power.

There's no such thing as legal wattage. There's no regulation on it other than your bike mustn't burn out. You might as well set it to maximum and use the normal levels on the LCD to regulate the power.

EU law EN15194 - the electric motor won’t assist you when you’re travelling more than 25 km/h (15.5mph); and the power doesn’t exceed 250 watts. SWX02-C Motor is labelled at 250 watt for EU import but is capable of 350 watt.

EU law EN15194 - the electric motor won’t assist you when you’re travelling more than 25 km/h (15.5mph); and the power doesn’t exceed 250 watts. SWX02-C Motor is labelled at 250 watt for EU import but is capable of 350 watt.

That's incorrect. It's the rated power that must be 250w or lower, not the motor's actual power. If your motor is labelled 250w, it's legal. You can then use a 48v battery and a 25 amp controller for 1000w input power (around 700w output) if you want and still be legal. If it's labelled 350w, you can't use it legally, even if it's identical in all other respects.

Hi everyone

I just installed a BFSWX02 48V 500W, and my surprise was when the motor is limited to 25km / h, then I bought the usb cable to try to limit this speed with the software ... but I can't.

Is it possible to change the configuration of this model?

thank you very much

The speed limit is usually altered via the display, but it will depend on the system in use.

Hello guys,

Just ordered this bafang kit.

 

If you have any advise to take care fo that would be great.

 

I will use it for delivery jobs.

 

Thanks

You only have to really make sure of one thing and that is when the hub is fitted make sure the hub axle slit is at the bottom so that the motor cable exits down and then forms a drip loop to stop water ingressing in to the motor.

You only have to really make sure of one thing and that is when the hub is fitted make sure the hub axle slit is at the bottom so that the motor cable exits down and then forms a drip loop to stop water ingressing in to the motor.

great advise! thanks

When installed, check that the rim is central to the frame. You might need to dish the wheel to get it in the centre.

 

When installing the wheel and you have a disc brake, get your spacing right from the disc side first. You need to make sure that the disc lines up with the caliper, which nearly always requires an extra standard 12mm washer between the motor and the frame.

can somebody tell me power/torque of bafang bfswx02 36v 250w motor ?because any website does not tell that information.

can somebody tell me power/torque of bafang bfswx02 36v 250w motor ?because any website does not tell that information.

Bafang make various versions of the same motor: 36V/48V, 12A/15A/17A and various speeds. The version with lower speed, higher voltage and higher current will have higher maximum torque.

You need to ask your supplier for the exact version you are buying.

can somebody tell me power/torque of bafang bfswx02 36v 250w motor ?because any website does not tell that information.

The SWX02 is a 250w motor. The torque and output power are determined by the amount of current and voltage you give it. What Bafang or anybody else says about it is meaningless. How much voltage and current you can give it depends to some extent on which speed version you have.

 

A 360v 260 rpm one (most common) can manage 20A comfortably and 25A if you're careful with it. At 48v, around 18A would be about right and 20A at a push. If you're heavy or have exceptionally steep hills, you'd be better off with a 201 36v rpm version run at 48v or a 48v 260 rpm one. Clinically obese people should get a 201 rpm 48v version and accept the lower speed. The 201 rpm one can manage 25A at 48v.

 

Torque is roughly proportional to volts x amps, so you can see that there's a big difference (216%) when comparing running one with 36v and 15A and one with 48v and 25A. I would guess that the 36v 15A one would make about 25Nm and the 48v 25A one around 60Nm.

 

The 48v versions of the motor are sometimes stamped with 350w or 500w, depending on where you get them from. It has to be stamped 250w to be legal, regardless of what version it is.

Hello Everyone, can someone support me to find spoke length for the bafang swx 02 c motor ?

I can do that for you but I need to know what rim you have.

Use this spoke calculator:

https://ebikes.ca/tools/spoke-calc.html

One has to measure the rim ERD/ effective rim diameter, this is the distance from one spoke nipple seat to the direct opposing one. All rims have different ERD's.