Search found 87 matches

by BotoXbz
Jul 07 2019 7:09pm
Forum: Battery Technology
Topic: sillicone layer over cell tops
Replies: 12
Views: 311

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: 22
Views: 860

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: 22
Views: 860

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: 22
Views: 860

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: 22
Views: 860

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: 80
Views: 4532

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: 1087
Views: 82277

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: 503

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: 278

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: 278

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: 80
Views: 4532

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: 158

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: 74
Views: 6743

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: 74
Views: 6743

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: 74
Views: 6743

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: 1080

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: 1087
Views: 82277

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: 941

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: 526

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: 222
Views: 29738

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: 494

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: 3918

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 ...
by BotoXbz
Apr 25 2019 5:38pm
Forum: Battery Technology
Topic: DIY 14S10P lasercut full wooden enclosure/cell holder
Replies: 23
Views: 1376

Re: DIY 14S10P lasercut full wooden enclosure/cell holder

Update for those that are interested how this battery is holding up: I used it to ride over 200km from Graz to Zagreb: https://cloud.botox.bz/s/poqrcWPeadoXkQW Mounted in a triangle bag with a little foam on my BBSHD powered hardtail: https://cloud.botox.bz/s/ykkSJri96XnMLGj I used about 70% of the ...
by BotoXbz
Apr 23 2019 8:37am
Forum: Battery Technology
Topic: Open Source BMS Project
Replies: 54
Views: 6780

Re: Open Source BMS Project

Here's open source firmware for some chinese BMS hardware which uses the TI BQ76940: https://github.com/BotoX/xiaomi-m365-compatible-bms
by BotoXbz
Apr 12 2019 8:30pm
Forum: E-Bike Non-hub Motor Drives
Topic: Programming the Bafang Middrive BBS01+BBS02
Replies: 1152
Views: 331044

Re: Programming the Bafang Middrive BBS01+BBS02

Well, not anymore. I wrote a really small python script that spoofs the login response of their server, letting one access the programming tool in the BESST software (tested with v1.06). For this to work you need to add the line "127.0.0.1 besst-api.yuntick.com" to c:\windows\system32\drivers\etc\h...