Search found 90 matches

by BotoXbz
Sep 01 2019 6:09pm
Forum: E-Bike Non-hub Motor Drives
Topic: Bafang BBSHD BBS02 mid drive -- Flexible OpenSource firmware
Replies: 33
Views: 2051

Re: Bafang BBSHD BBS02 mid drive -- Flexible OpenSource firmware

I know there is a second MCU on the board, here is some info on what it could be: https://electrotransport.ru/ussr/index. ... msg1324810

D79F9211

But I guess it might not be related to the motor control and it's doing something else.
by BotoXbz
Aug 31 2019 8:13pm
Forum: E-Bike General Discussion
Topic: How To, 50A BBSHD Controller Mod
Replies: 237
Views: 33375

Re: How To, 50A BBSHD Controller Mod

Hi. Can you guys please tell me what is the microcontroller on the motor controller board?? I saw that there are connections for 3 halls sensors from the motor + the connections of the 3 phases. The controller on the BBSHD is garbage, it's using a Chinese STC15W4K32S4 series MCU There is a second M...
by BotoXbz
Jul 20 2019 8:11pm
Forum: E-Bike General Discussion
Topic: I saw a park ranger call out an e-bike rider on FL bike path.......
Replies: 41
Views: 1463

Re: I saw a park ranger call out an e-bike rider on FL bike path.......

Imo PAS is much more dangerous in situations where you only want to apply a little power (like in tight turns) but the motor amplifies your strength and it's way too much. My BBSHD threw me off the bike that way when I forgot to turn off PAS in a tight turn on gravel. I was going at about 5 km/h and...
by BotoXbz
Jul 07 2019 7:09pm
Forum: Battery Technology
Topic: sillicone layer over cell tops
Replies: 12
Views: 466

Re: sillicone layer over cell tops

I love the thermal argument that keeps on being brought up here. Air is a much better insulator than silicone. The foam stuff that a lot of people wrap their batteries in is a much better insulator than silicone. And you really shouldn't be running your pack at such crazy levels that heat is an issu...
by BotoXbz
Jun 30 2019 6:17am
Forum: Battery Technology
Topic: Fantastic BMS And Where To Find Them (?)
Replies: 24
Views: 1341

Re: Fantastic BMS And Where To Find Them (?)

> Do you really need that high balancing current? Depends on the use case and cell size, but yes, even with brand new top notch cells treated perfectly. I doubt you'll really need much more balancing current with new brand cells. I have a 14S10P Panasonic PF pack from "recycled" cells (new from wel...
by BotoXbz
Jun 29 2019 8:21pm
Forum: Battery Technology
Topic: Fantastic BMS And Where To Find Them (?)
Replies: 24
Views: 1341

Re: Fantastic BMS And Where To Find Them (?)

So are there lots of "other bluetooth" BMS that don't use the "xiaoxiang" app? There are, I've never used them however. I think Em3v uses a different one in their battery packs. Are there any BT-compatible **balancers** (may or may not be protective as well) that feature a high balancing current, a...
by BotoXbz
Jun 29 2019 12:36pm
Forum: Battery Technology
Topic: Fantastic BMS And Where To Find Them (?)
Replies: 24
Views: 1341

Re: Fantastic BMS And Where To Find Them (?)

BotoXbz ,...I am contemplating trying out the LLT BMS. How long have you been using them and how would you rate your satisfaction with them? I've been using mine for a little more than a year. There's a few threads on ES about them, basically any BMS that uses the "xiaoxiang" app is almost the same...
by BotoXbz
Jun 29 2019 6:09am
Forum: Battery Technology
Topic: Fantastic BMS And Where To Find Them (?)
Replies: 24
Views: 1341

Re: Fantastic BMS And Where To Find Them (?)

The "smart BMS" from this company: https://www.lithiumbatterypcb.com/product-instructionev-battery-pcb-boardev-battery-pcb-board/ev-battery-pcb-board/smart-bms-of-power-battery/ use the Texas Instruments BQ76940 analog front-end IC for undervoltage, overvoltage and overcurrent. The TI IC also drives...
by BotoXbz
Jun 15 2019 4:02am
Forum: E-Bike Non-hub Motor Drives
Topic: BBSHD Voltage Problem Firmware Update & Instructions
Replies: 86
Views: 7489

Re: BBSHD Voltage Problem Firmware Update & Instructions

You could probably order one of the compatible ICs from China and solder that instead.
Then you could program it with the software here.
Or maybe try to ask bafang support for the correct firmware while explaining your situation.
by BotoXbz
Jun 11 2019 3:35am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1124
Views: 97940

Re: bluetooth BMS?

What would be advisable settings for 42V pack? Its 14AH. this is what i have atm: Untitled.png I guess this screenshot shows why your last battery FAILED. IMHO if you got "balance" activated it will balance ALL THE TIME. It will try to reach your 30mV delta ALL THE TIME. So it will never really sle...
by BotoXbz
Jun 09 2019 6:25pm
Forum: E-Bike General Discussion
Topic: old motors inefficient?
Replies: 12
Views: 646

Re: old motors inefficient?

>But it seems to drink the juice twice as fast as it should.

And you're sure it's not your battery?
Because that's a part that will actually get worse with use and age.

As far as I know permanent magnets will only demagnetize with heat.
by BotoXbz
May 30 2019 6:45am
Forum: E-Bike Technical
Topic: Reention POLLY DP-6C - 70 cell battery case - how fit BMS?
Replies: 7
Views: 455

Re: Reention POLLY DP-6C - 70 cell battery case - how fit BMS?

I said copper plane not copper bar :p There is copper on the PCB under the FETs which is connected with lots of through holes to the copper on the underside of the PCB. That will dissipate the little heat easily. But even without that the 1/4 Watt of heat on each of those chunky FETs is nothing. Wha...
by BotoXbz
May 30 2019 6:07am
Forum: E-Bike Technical
Topic: Reention POLLY DP-6C - 70 cell battery case - how fit BMS?
Replies: 7
Views: 455

Re: Reention POLLY DP-6C - 70 cell battery case - how fit BMS?

You made a good choice with the 30A bluetooth BMS. It uses five KIA KNB3308A FETs in parallel, the gate of the FETs is driven with 12V. The datasheet states a resistance of 6.2mΩ per FET, you have 5 of them 6.2mΩ/5 = 1.24mΩ. (I've measured the resistance on mine at 1A each and got 6.2mΩ - 6.4mΩ per ...
by BotoXbz
May 23 2019 6:49am
Forum: E-Bike Non-hub Motor Drives
Topic: BBSHD Voltage Problem Firmware Update & Instructions
Replies: 86
Views: 7489

Re: BBSHD Voltage Problem Firmware Update & Instructions

Hmm, I get the following error on a BBSHD with throttle problem: Checking target MCU ... MCU type: STC15W4K56S4 F/W version: 7.3.5T Current H/W Option: . Current system clock source is internal IRC oscillator . IRC frequency: 18.427MHz . Oscillator gain is HIGH . Wakeup Timer frequency: 36.720KHz . ...
by BotoXbz
May 23 2019 5:34am
Forum: Battery Technology
Topic: Bluetooth BMS with IR compensation
Replies: 3
Views: 237

Re: Bluetooth BMS with IR compensation

You could modify the code of my BMS: https://github.com/BotoX/xiaomi-m365-compatible-bms It runs on this BMS hardware from china: https://www.lithiumbatterypcb.com/product/13s-48v-li-ion-battery-pcb-board-54-6v-lithium-bms-with-60a-discharge-current-for-electric-motorcycle-and-e-scooter-protection-2...
by BotoXbz
May 14 2019 4:32pm
Forum: Battery Technology
Topic: Rectifier Huawei R4850G2 48V 42~58V 3000w
Replies: 76
Views: 8613

Re: Rectifier Huawei R4850G2 48V 42~58V 3000w

I have no clue what you are on about. The PSU has - and + Earth is only for AC and is for human / equipment protection If you want to connect them in series do - + - + In parallel - - ++ I run a single one connect to european 230V with ground connect my battery - to psu - and battery + to psu + you ...
by BotoXbz
May 14 2019 1:05pm
Forum: Battery Technology
Topic: Rectifier Huawei R4850G2 48V 42~58V 3000w
Replies: 76
Views: 8613

Re: Rectifier Huawei R4850G2 48V 42~58V 3000w

Chassis is earthed (which is mandatory for a metal enclosure)
- is not connected to earth
by BotoXbz
May 13 2019 5:50pm
Forum: Battery Technology
Topic: Rectifier Huawei R4850G2 48V 42~58V 3000w
Replies: 76
Views: 8613

Re: Rectifier Huawei R4850G2 48V 42~58V 3000w

A little update on my PSU hacking attempts: https://cloud.botox.bz/s/YiDciose2DwzkTL/preview I love it, But I wonder does bluetooth penetrate the case when its closed, or are you not planning to close it? Work in progress still, code on GitHub https://github.com/BotoX/huawei-r48xx-esp32 Using this ...
by BotoXbz
May 10 2019 1:05pm
Forum: Battery Technology
Topic: Which high capacity 18650 cell for 250w ebike battery pack with heavy usage?
Replies: 35
Views: 1355

Re: Which high capacity 18650 cell for 250w ebike battery pack with heavy usage?

The 3.5Ah cells will have somewhat worse cycle life because of added SiO2 in the anode.
So I'd probably go with the NCR18650B considering your low amp draw.
by BotoXbz
May 09 2019 8:28am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1124
Views: 97940

Re: bluetooth BMS?

If his charger is shit and he doesn't want to get a new one then he can use a BMS to limit the max charge voltage of his cells. A BMS is a safety device and should not be necessary to control his charge process, but it can certainly be used to do this. Now first of all, if you are using regen you ha...
by BotoXbz
May 07 2019 7:50am
Forum: E-Bike Technical
Topic: Bafang BBSHD Over Voltage Protection issue on 52v
Replies: 24
Views: 1356

Re: Bafang BBSHD Over Voltage Protection issue on 52v

There seems to be like three threads about this issue right now and no real answer on how to flash the new firmware: https://endless-sphere.com/forums/viewtopic.php?f=28&t=100011&p=1464513#p1464513 https://endless-sphere.com/forums/viewtopic.php?f=3&t=83778&p=1464511#p1464511 https://www.reddit.com/...
by BotoXbz
May 06 2019 4:42pm
Forum: E-Bike Non-hub Motor Drives
Topic: Bafang bbshd
Replies: 8
Views: 657

Re: Bafang bbshd

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...
by BotoXbz
May 06 2019 4:42pm
Forum: E-Bike General Discussion
Topic: How To, 50A BBSHD Controller Mod
Replies: 237
Views: 33375

Re: How To, 50A BBSHD Controller Mod

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...
by BotoXbz
May 05 2019 8:51pm
Forum: General Discussion
Topic: What type of plastic XT60 and EC5?
Replies: 9
Views: 626

Re: What type of plastic XT60 and EC5?

As far as I know they're made of heat resistant nylon.
If your soldering temperature is too high and you leave the iron on it too long it'll still melt though (a tiny bit usually so the contacts aren't held in place tightly anymore and can rotate)
by BotoXbz
May 02 2019 7:30pm
Forum: E-Bike General Discussion
Topic: First E-Bike - Doing DIY BBSHD - Critique my plan
Replies: 162
Views: 4962

Re: First E-Bike - Doing DIY BBSHD - Critique my plan

Hey OP, I have a BBSHD on my hardtail and it works just fine for almost 2000km, even did a 200km trip with it. Sure a suspension bike would be better for some situations, but if you ride it like a bicycle most of the time you will have no problem. For me it's still a bicycle with the possibility of ...