## Search found 17 matches

Mar 27 2020 9:56pm
Forum: Battery Technology
Topic: Test a battery pack. How can i easily create a high amp load?
Replies: 15
Views: 1098

### Re: Test a battery pack. How can i easily create a high amp load?

An old electric kettle will do the job. Mine is rated 1500 W on 120 V Since power is proportional to V squared we can readily find the power at any other voltage. For a 48 V battery, for example, the power will be 1500 W * 48^2 / 120^2 = 240 W The current will be 240 W / 48 V = 5 A That's probably c...
Mar 15 2019 7:19pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1442
Views: 175066

### Re: bluetooth BMS?

crossbeak requests Hi, do you have an APK of the newer Version 2 app pls? The only source i now is the store If your request was directed at me the version I'm using is Xiaoxiang V2.1.1022 as posted by multifrag on Mar 08 2019 5:43am I've attached the .apk in 7z archive. Attachments xiaoxiangprotect...
Mar 15 2019 2:34pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1442
Views: 175066

### Re: bluetooth BMS?

Xiaoxiang V2.1.1022 screenshot:
Screenshot_2019-03-15-11-17-13sm.png (26.08 KiB) Viewed 2296 times
Anyone know what the values mean?
Feb 14 2019 11:21pm
Forum: Battery Technology
Topic: 48V Li-Ion shuts itself down at ~45V
Replies: 8
Views: 652

### SOLVED - 48V Li-Ion shuts itself down at ~45V

The problem was a dead cell. The procedure I followed to diagnose the problem: 1. Checked group voltages via the bms leads Result: group 5 was low voltagessm.png 2. Tested group 5 with liitokala lii-500 using a dummy cell and the bms leads. Result: 7.20 Ah This indicates that only 3 of the 4 cells w...
Dec 14 2018 12:11am
Forum: Battery Technology
Topic: 48V Li-Ion shuts itself down at ~45V
Replies: 8
Views: 652

### Re: 48V Li-Ion shuts itself down at ~45V

Thank you amberwolf for citing all the possibilities. I hadn't even considered the charger.
Open-it-up day will have to wait for sometime after the 25th when the house gets quiet again. Unnecessary distractions would not be helpful.
Dec 13 2018 1:51pm
Forum: Battery Technology
Topic: 48V Li-Ion shuts itself down at ~45V
Replies: 8
Views: 652

### Re: 48V Li-Ion shuts itself down at ~45V

amberwolf replies: Most wattmeters I've seen have an Aux input for a battery to sustain them when mainpower is cut. It doesn't help in this case. Vmin is zero, not the value an instant earlier. If you're using a simple resistive load, then as the voltage drops, so does the current being drawn, so th...
Dec 10 2018 11:23pm
Forum: Battery Technology
Topic: 48V Li-Ion shuts itself down at ~45V
Replies: 8
Views: 652

### 48V Li-Ion shuts itself down at ~45V

My battery is a generic 48V 10.5Ah on an ebike with 5800 km on it. Recently the BMS has started shutting the motor off whenever V drops to about 45 V. I can't tell exactly because my wattmeter resets itself when the supply drops to zero. I can replicate its behaviour using a resistive load indoors. ...
Dec 08 2018 2:14pm
Forum: Motor Technology
Topic: TSDZ2 mid drive with 860C, 850C or SW102 displays only -- Flexible OpenSource firmware (Casainho code only)
Replies: 5620
Views: 383370

### Re: TSDZ2 mid drive -- Flexible OpenSource firmware for TongSheng TSDZ2 mid drive motor

linklemming asked What stock firmware are you talking about? Sorry I wasn't clear. I meant the original firmware from Tongshen. The numbers I mentioned are based on their sales literature from a couple of years ago. I was impressed at the time because human perception of effort is a roughly logarith...
Dec 08 2018 12:40pm
Forum: Motor Technology
Topic: TSDZ2 mid drive with 860C, 850C or SW102 displays only -- Flexible OpenSource firmware (Casainho code only)
Replies: 5620
Views: 383370

### Re: TSDZ2 mid drive -- Flexible OpenSource firmware for TongSheng TSDZ2 mid drive motor

linklemming writes I can definately feel difference between assist 1(0.5) and 2(1.0) but 3-5(1.5,2.0,2.5) seem the same unless I intentionally barely use the pedals (low cadence, low pressure) The stock firmware uses torque assist levels of 0.4, 0.75, 1.5, and 3.0 Note the progression, each step is ...
Nov 21 2018 3:18pm
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 7230
Views: 755188

### Re: New "TSDZ2 Torque Sensor Central Motor"

crun said: I think that working with the stock XH18 would be very beneficial*, which has very much the same requirement: you can config the motor eeprom using LCD3/Phone/PC/STLink+default-eeprom-hex-files, then it will run with stock XH18 (or in your case no display), and only needs to get the assis...
Oct 24 2018 7:25pm
Forum: Motor Technology
Topic: TSDZ2 mid drive with 860C, 850C or SW102 displays only -- Flexible OpenSource firmware (Casainho code only)
Replies: 5620
Views: 383370

Can anyone explain to me the advantage of spinning the pedals at a high cadence? Numbers have been mentioned as high as 120rpm. There are two reasons I ask. First, any text on bio-mechanics tells us that muscles are strongest when they're stationary and get weaker as he speed of contraction increase...
Aug 19 2018 11:35am
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 7230
Views: 755188

### Thanks for the videos jbalat

To jbalat
If anyone is interested I just finished Part 4
part 4.png (109.57 KiB) Viewed 2014 times
Thanks for the time and effort in producing these videos.
Finally a set of coherent instructions for the rest of us.

Angus
Jun 27 2018 1:25am
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 7230
Views: 755188

### Re: New "TSDZ2 Torque Sensor Central Motor"

<snip> The point is if something unexpected happens and the wheel stops suddenly then your motor is toast, and that is a design flaw. <snip> The manufacturer should be doing something about it. People are breaking their motors with very little use, some are so worried that they are stockpiling part...
Jun 25 2018 10:32pm
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 7230
Views: 755188

### Re: New "TSDZ2 Torque Sensor Central Motor"

Its amazing how everyone needs or wants something different ..... exactly !.. most users expect slightly different results from their bike experience. It also depends on what you have been used to in the past. Many of us have come from a "throttle based" control set up , ( both Ebike and ICE) where...
Jun 21 2018 12:36pm
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 7230
Views: 755188

Casainho replied to my query about adding a datalogger: Technically is very easy to implement that with our improved original firmware, because all of that data is already sent to the LCD3 by the serial line. Anyway, I think that best idea is just to connect in parallel to the wire that comes from ...
Jun 20 2018 11:35pm
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 7230
Views: 755188