Bafang bbshd

Discussions related to motors other than hub motors.
This includes R/C motors, botttom bracket, roller and geared drives.
Post Reply
Cbisbaf   10 mW

10 mW
Posts: 24
Joined: May 04 2019 3:26pm

Bafang bbshd

Post by Cbisbaf » May 04 2019 3:32pm

Built a bike to get me to and from work. I built my battery pack from scratch and used Samsung 30q cells 4.2 fully charged. When using it after charging I got error 06 but I was under the assumption that the Controller and screen were rated to 60. The display is reading 58.6v but no power to anything due to overvolt protection. Is there any way around this.
It's a dpc18
Bafang bbshd
6000mah Samsung pack with a 45a BMS.

User avatar
amberwolf   100 GW

100 GW
Posts: 30470
Joined: Aug 17 2009 6:43am
Location: Phoenix, AZ, USA, Earth, Sol, Local Bubble, Orion Arm, Milky Way, Local Group
Contact:

Re: Bafang bbshd

Post by amberwolf » May 04 2019 11:59pm

this is a common problem on these systems, with any pack over 13s. so if you use a 48v pack it should work fine, but a 52v pack, which is 14s, may only work if you odn't fully charge it.

for now you can put a 100w incandescent light bulb across the pack outputs to drain it down until it works, testing incrementally until you find the cutoff point.

there's a few threads about bbs systems especially recently for this problem, and the only effective solutions i've seen so far are

--send the system back to the seller for reprogramming to work on the voltage you're using, if they even can

or

--rebuild your battery to 13s

or

--just don't charge your 14s pack over whatever voltage the controller gives you the error code at.


the first one may not be cost-effective, if the seller is not local to you, because of shipping and customs costs

the second may be impractical, but possible

the third is practical, though you may want to periodically charge to full and then drain down to the voltage limit, so it balances the cells, which most bms wont' do unless it's at full votlage level.


EDIT: there may be a fourth option, which involves you reprogramming the BBS, and could brick it, making it completely unusable, and void all warranties, but has fixed the problem for some:
viewtopic.php?f=28&t=100064
Last edited by amberwolf on Jun 26 2019 10:36pm, edited 1 time in total.

Cbisbaf   10 mW

10 mW
Posts: 24
Joined: May 04 2019 3:26pm

Re: Bafang bbshd

Post by Cbisbaf » May 05 2019 2:54am

Thank you for the quick reply well that issue annoying haha. Is there not a resistor value s can change somewhere in order to fool the controller or even reprogramming myself. As I have already bought the charger and bms. Any help appreciated.

User avatar
TommyCat   1 kW

1 kW
Posts: 387
Joined: Jan 22 2018 8:05pm
Location: North-west Illinois, USA

Re: Bafang bbshd

Post by TommyCat » May 05 2019 9:14am

It sounds like some have been able to fool the controller with a voltage dropper circuit to the display with diodes.

See...

https://endless-sphere.com/forums/viewt ... 28&t=94022

other efforts...

https://endless-sphere.com/forums/viewt ... 8&start=75
See my completed Magic Pie V5 rear hub E-Bike build Here!

Cbisbaf   10 mW

10 mW
Posts: 24
Joined: May 04 2019 3:26pm

Re: Bafang bbshd

Post by Cbisbaf » May 05 2019 10:29am

i found a post from 4 weeks ago on reddit about some bad controllers that went out from bafang. turns out a firmware update solves this. unsure how but i have spent my day trying to find this new firmware to no prevail. my issue is not to overvolt the controller but to just have it work. i know luna fixed it and Biktrix so im trying to get it from them but i dont think they will be of help as i didnt purchase from them. even offered money for firmware haha.

Cbisbaf   10 mW

10 mW
Posts: 24
Joined: May 04 2019 3:26pm

Re: Bafang bbshd

Post by Cbisbaf » May 05 2019 10:36am


BotoXbz   10 W

10 W
Posts: 91
Joined: May 20 2018 7:00am

Re: Bafang bbshd

Post by BotoXbz » May 06 2019 4:42pm

Here's the latest firmware for the BBSHD btw. that fixes the overvolt error: https://i.botox.bz/CRR10E5228E1050221_190418.bin

Edit: Okay, I just tried with the Bafang BESST Software and a CP2102 UART Dongle and wasn't able to get any response from the motor, the BafangConfigTool works fine but BESST can't connect to the motor at all.

Cbisbaf   10 mW

10 mW
Posts: 24
Joined: May 04 2019 3:26pm

Re: Bafang bbshd

Post by Cbisbaf » May 07 2019 2:13pm

got it working 3 n4004 diodes in series on the screen

User avatar
amberwolf   100 GW

100 GW
Posts: 30470
Joined: Aug 17 2009 6:43am
Location: Phoenix, AZ, USA, Earth, Sol, Local Bubble, Orion Arm, Milky Way, Local Group
Contact:

Re: Bafang bbshd

Post by amberwolf » May 08 2019 3:03pm


Post Reply