Bafang m820

[Dado]

Does anyone know how natural the m820 torque sensor implementation is compared to a Specialized Levo SL? I’m trying to convince my wife to trade in the Specialized for a m820 bike and she is worried it won’t be as smooth and natural feeling.

She is right. Lets wait for sucessor of M820.

 

[Dado]

Picture of battery wires on left and incorrect wire on right.

View attachment 135890

So now I saw already 4 different types of connectors for battery CAN. Thats crazy.

I doubt you would find easily main cable with green round connector to battery.

You can try to build it DYI. I just did one recently to one customer as he wanted to have throttle support. That was 3pin triangle though. Anyway, you can run it also from speed sensor connector.
And motor works also without Battery CAN connector.

 

[keyne]

I just did one recently to one customer as he wanted to have throttle support.

It’s possible to use throttle with m820?

 

[Dado]

No, M820 is not supporting throttle. Sorry for confuson, it was M510 customer.

 

[keyne]

She is right. Lets wait for sucessor of M820.

Is it that bad? Specialized is very natural, m600 feels like a delayed light switch on comparison. Which is m820 closer to?

 

[mike_kelly]

M820 is very good.

 

[borysgo2]

I found the issue. I guess I was being a bit too aggressive when stashing the cables and severed the +/- wires.
View attachment 133939


Some dremel tool work:
View attachment 133940

Solder and epoxy:
View attachment 133941
View attachment 133942
And it's taking a charge.

Thanks again for all of your help.

Have had exactly same issue with my port, simply I have replaced it with standard 5.5mm/2.2mm round socket. Way easier to deal with.

 

[LAnton]

Is it possible to somehow make the M820 work from the throttle stick? It can somehow bind to the walking mode, only increase the speed. Or trick the torque sensor so that the motor runs from the button. It is enough to have a low speed in the area of 10 km/h at the touch of a button, as in the example with walking mode. It is very convenient when a leg is injured or it is necessary to cross a deep river.

 

[mike_kelly]

Knowing that the M820 is not protected at all from water in the CEF50, if I have to cross a deep river the CEF50 is going to be on my back. I don't think there is any way to add a throttle. I think M820 was specifically designed so that could not be done.

 

[52nd]

Hi guys, do you think sram gx cranks fc-gx-pa-d1 will fit m820? Thanks

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[mike_kelly]

Most likely but there have been different versions of bosche cranks over the years. Also you have to be concerned with "Q". How close the pedals are to the frame. Also, of course, crank length.

 

[spokémon]

If compared with Levo SL just buy her Levo SL before she complained hahahahaha...

I agree. If she'd happy with the current Levo SL, let it be I say.

 

[keyne]

I agree. If she'd happy with the current Levo SL, let it be I say.

Her alloy levo SL is only 240w and 320whr battery, the motor isn’t exactly quiet and it weighs 20kg. It is nice to ride but she wants a bit more power and more range if possible. I thought the lce930 frame with m820 motor could be a good option. Just worried about the m820 controller and how intuitive it is to pedal input compared to the levo.

 

[patdam]

Her alloy levo SL is only 240w and 320whr battery, the motor isn’t exactly quiet and it weighs 20kg. It is nice to ride but she wants a bit more power and more range if possible. I thought the lce930 frame with m820 motor could be a good option. Just worried about the m820 controller and how intuitive it is to pedal input compared to the levo.

lot off parameters can be adjust (with BESST tool) on the M820 to personalize motor functioning

 

[spokémon]

Her alloy levo SL is only 240w and 320whr battery, the motor isn’t exactly quiet and it weighs 20kg. It is nice to ride but she wants a bit more power and more range if possible. I thought the lce930 frame with m820 motor could be a good option. Just worried about the m820 controller and how intuitive it is to pedal input compared to the levo.

The M820 isn't quiet either, but the frame allows for a bigger battery than SL and certainly has much more power.
As @patdam has said, the motor can be tuned to your preference. The only thing I don't like is the slight over-run.
It's not aggressive, but it is there, and it's not tunable.

The SL looks well packaged/presented (fit, finish, app) whereas the M820 is a DIY system. But it allows you the most flexibility.

Specialized is very natural, m600 feels like a delayed light switch on comparison. Which is m820 closer to?

I've never ridden an SL, but the M820 certainly doesn't feel like a "delayed light switch"

 

[Dado]

Is it possible to somehow make the M820 work from the throttle stick? It can somehow bind to the walking mode, only increase the speed. Or trick the torque sensor so that the motor runs from the button. It is enough to have a low speed in the area of 10 km/h at the touch of a button, as in the example with walking mode. It is very convenient when a leg is injured or it is necessary to cross a deep river.

Hello Lanton.

Even if the hardware pin for throttle would be connected to microcontroller, they just disabled function in firmware which is taking care of throttle - it is just analogue value.
You would need to hack the firmware. Or as you saying somehow trick torque sensor - which means to get between controller and torque sensor (that 6 pin connector).

And one fun fact, that torque sensor is not communicating over CAN.

 

[aledavi]

Hello.

I am riding a set of LCE930 electric bike with Bafang M820 motor.
I would like to buy a 32-tooth chainring, but I can't find it anywhere.
Could someone tell me where I can buy it?

greetings

 

[patdam]

Hello.

I am riding a set of LCE930 electric bike with Bafang M820 motor.
I would like to buy a 32-tooth chainring, but I can't find it anywhere.
Could someone tell me where I can buy it?

greetings

? all of 32 teeths in 104 BCD on the market fit. What do you search exactly to don't found that ?

 

[aledavi]

? all of 32 teeths in 104 BCD on the market fit. What do you search exactly to don't found that ?

Hello.
What I'm looking for is a 32T chainring since the one the motor comes with is 34T and I find it too big for me. Currently on my mtb I go with a 32T chainring and it seems to me that it will be very big.
I would like to buy a 32T one
greetings

 

[borysgo2]

Buy a spider for BCD104 and get whatever color You like.

 

[aledavi]

Buy a spider for BCD104 and get whatever color You like.

View attachment 138726

hello
thanks for answering.

I was looking for the one-piece plate, with that I have to buy a spider.

What spider would I need?

greetings

 

[patdam]

Hello.
What I'm looking for is a 32T chainring since the one the motor comes with is 34T and I find it too big for me. Currently on my mtb I go with a 32T chainring and it seems to me that it will be very big.
I would like to buy a 32T one
greetings

View attachment 138725

Ok. clear. Your motor is not provided with spider (first time i see that ?). You can find a lot in ali (same than M510). But, as i haven"t purchased i can't recomand one in particular, i'm not sure that all keep the same width for chain line. ask to dealers if they have original width. Or ask to your motor supplier, the original bafang spider.

 

[aledavi]

Ok. clear. Your motor is not provided with spider (first time i see that ?). You can find a lot in ali (same than M510). But, as i haven"t purchased i can't recomand one in particular, i'm not sure that all keep the same width for chain line. ask to dealers if they have original width. Or ask to your motor supplier, the original bafang spider.

thank you so much