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by lqbweb
Nov 10 2019 9:31am
Forum: E-Bike General Discussion
Topic: Best 21700 downtube case?
Replies: 0
Views: 1199

Best 21700 downtube case?

I am looking for a downtube battery case to host my new 13s3p pack (with Samsung 40T 21700 cells). So far, Nick from Reention told me of a new model 4C-21700, but I can't find it anywhere. Also I know there is another one from Hailong, but to be honest they look a bit too plastic and shit, am I gett...
by lqbweb
Oct 12 2019 3:50am
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3930
Views: 348926

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

I have quite the same question but the other way around : I have a 36/48V version, but I want to run it at 52V. The FETs and caps were changed to their 80V counterparts to accomodate higher voltage (and I am thinking about changing the LM317 regulator*), but is there any hardware modification to ma...
by lqbweb
Dec 30 2018 7:22pm
Forum: E-Bike Technical
Topic: Passion eBike 6 FET Kunteng Controller (S06S)
Replies: 66
Views: 22782

Re: Passion eBike 6 FET Kunteng Controller (S06S)

I've updated my second post with a better picture :D . ice, I'm thinking of doing the same fet mod (and replacing caps) for 14S There is already modified 13s (48V) version of the S06S on aliexpress for about 40USD with P&P. For 14S,the modification is the same as for 75V i.e. 100V capacitors, 400V ...
by lqbweb
Jul 31 2018 4:22am
Forum: E-Bike General Discussion
Topic: New project. Q128c, folding bike.
Replies: 0
Views: 322

New project. Q128c, folding bike.

I am converting one folding bike 20 inches that I have around here for a relative. I am planning to use a <150mm motor, I think the q128c 328rpm 36V would be a good choice. I can overvolt it to 48V, or perhaps better at 52V? I aim for 40kph loaded. My other option is a Mxus XF15R 440rpm at 48volts, ...
by lqbweb
Jul 25 2018 5:42am
Forum: Motor Technology
Topic: wye/delta switch on q100h?
Replies: 0
Views: 336

wye/delta switch on q100h?

I am powering a q100h 260rpm (on the front) with 48v and 20amps with a Kuteng controller. Already for several years, running fine. I am achieving a top speed of around 40km/h on 700c wheels. I see that, at that speed the wattage drops down to 400-500W (from around 700-800W), due to the battery volta...
by lqbweb
Jul 23 2018 1:32pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Project Interceptor, oil cooled Q100H@55V, in-frame battery
Replies: 36
Views: 12560

Re: Project Interceptor, oil cooled Q100H@55V, in-frame batt

Thank you both:). Yellow one is holding up well. Problems I had were faulty controller few months ago, and slight ATF oil leakage wich does not bother me. Motor is untouched, I just unscrewed one of 6 disc screws, filled with ATF and used automotive grade silicon (for automatic transmissions) to se...
by lqbweb
Jul 07 2018 5:43am
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3930
Views: 348926

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

Hmm... I thought that the motor size or the power rating is irrelevant since the power output is dependent from the max current of the controller times the battery voltage... I have read somewhere that people are driving their "250W" motors up to 1kW and above with no problems at all. So the rating...
by lqbweb
Jul 04 2018 5:30am
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3930
Views: 348926

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

Ey guys, may I ask you something I was wondering myself: I have a q100h with this controller and a simple PAS. I understand that this works like on/off, with a variable current (depending on your assistance level). I was thinking how to get higher top speed on my setup. The top speed is limited by ...
by lqbweb
Jul 04 2018 4:10am
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3930
Views: 348926

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

Ey guys, may I ask you something I was wondering myself: I have a q100h with this controller and a simple PAS. I understand that this works like on/off, with a variable current (depending on your assistance level). I was thinking how to get higher top speed on my setup. The top speed is limited by t...
by lqbweb
May 12 2018 7:01am
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3930
Views: 348926

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

Casainho wrote: - 2. Dead time: so, you have a different controller from me, I have S06S from BMSBattery and there may be difference between them. As you can see, I did measured a dead time near1us on my controller and firmware is using 1us. I think that if your controller dead time must be a littl...
by lqbweb
May 07 2018 1:27pm
Forum: E-Bike Technical
Topic: KT LCD3 firmware -- Flexible OpenSource firmware for Kunteng KT-LCD3
Replies: 105
Views: 14400

Re: LCD3 firmware -- Flexible OpenSource firmware for Kunteng LCD3

For lcd3 i miss a frocking clock. I can't believe there is none, of course I guess it is not possible as there is no battery for that. Appart from that, i am not really missing anything. It is more on the controller side rather than the display itself What do you miss on the controller side? I am m...
by lqbweb
May 07 2018 1:22pm
Forum: E-Bike Technical
Topic: KT LCD3 firmware -- Flexible OpenSource firmware for Kunteng KT-LCD3
Replies: 105
Views: 14400

Re: LCD3 firmware -- Flexible OpenSource firmware for Kunteng LCD3

Have you seen the luna ebike kit with the 2 speeds Xiongda motor hub? That color LCD is using the same protocol or a variant of the Kunteng controller i think. It would be awesome to have a full LCD display, instead of the LCD3. You could display a lot more information. Maybe the efforts should be s...
by lqbweb
May 07 2018 1:10pm
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3930
Views: 348926

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

Have you seen guys that for instance the phaserunner has a mode to autotune the motor? You are meant to spin the motor by hand i think while connected to the computer. Is this anything useful for you? You could figure out the sequence and angles maybe?
by lqbweb
May 07 2018 2:48am
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3930
Views: 348926

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

ok, I just dont see any possible reason to blame the dc dc regulator. That net is completely independent. I am tempted to flash this, but I am waiting for a second controller to arrive from China in order to have a backup. I need this controller working. As a reason to blame it i see that, it was w...
by lqbweb
May 06 2018 3:18pm
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3930
Views: 348926

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

ok, I just dont see any possible reason to blame the dc dc regulator. That net is completely independent.
I am tempted to flash this, but I am waiting for a second controller to arrive from China in order to have a backup. I need this controller working.
by lqbweb
May 06 2018 3:08pm
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3930
Views: 348926

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

Today I tried again my controller on a real ride. P5 set to 0 and the battery indicator was displaying emtpy, even though the battery was full. So same behavior as with my power supply at home. Again, when the voltage drops under 30v, it starts blinking. But otherwise it says always empty if P5=0, ...
by lqbweb
May 06 2018 2:24pm
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3930
Views: 348926

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

Today I tried again my controller on a real ride. P5 set to 0 and the battery indicator was displaying emtpy, even though the battery was full. So same behavior as with my power supply at home. Again, when the voltage drops under 30v, it starts blinking. But otherwise it says always empty if P5=0, o...
by lqbweb
May 03 2018 1:31pm
Forum: E-Bike Technical
Topic: KT LCD3 firmware -- Flexible OpenSource firmware for Kunteng KT-LCD3
Replies: 105
Views: 14400

Re: LCD3 firmware -- Flexible OpenSource firmware for Kunteng LCD3

For lcd3 i miss a frocking clock. I can't believe there is none, of course I guess it is not possible as there is no battery for that.

Appart from that, i am not really missing anything. It is more on the controller side rather than the display itself
by lqbweb
May 01 2018 9:08am
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3930
Views: 348926

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

Do you know how the battery is monitored down at hardware level? From the schematics I see the pin 24 with an analog input from the battery, is it just reading the raw voltage directly from the battery there, and then sent already converted to digital via the TX RX pins to the display ? Looking at ...
by lqbweb
Apr 30 2018 4:47am
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3930
Views: 348926

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

ey guys, is there anyway to do a backup of the original firmware before flashing yours? I did not see it in your documentation. Also, from what I see in the last posts, this firmware seems to be more efficient than the original (quieter, etc) but still not getting all the max power of the original f...
by lqbweb
Apr 30 2018 4:27am
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3930
Views: 348926

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

I thought the LCDs received the full battery supply voltage and had their own microcontroller for evaluating charge level. Initially I thought that too, but I saw in the communication protocol instructions for the battery, so no. The display takes VIN because it acts as a switch, on power on the re...
by lqbweb
Apr 29 2018 3:24pm
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3930
Views: 348926

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

guys, my controller is working now. I have dropped the idle wattage from 3W to 1.5W, not bad. But I only have one issue: The battery indicator at the lcd is always showing full. I am powering it up with a power supply (not with a battery). I start it with 40V (simulating a 36v battery fully charge)...
by lqbweb
Apr 29 2018 7:02am
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3930
Views: 348926

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

guys, my controller is working now. I have dropped the idle wattage from 3W to 1.5W, not bad. But I only have one issue: The battery indicator at the lcd is always showing full. I am powering it up with a power supply (not with a battery). I start it with 40V (simulating a 36v battery fully charge) ...
by lqbweb
Apr 28 2018 8:21am
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3930
Views: 348926

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

ok, here is my question solved: https://electronics.stackexchange.com/questions/371143/lm317-input-connected-to-output/371158#371158 thanks anyway. those cheap dc switch regulator are a bit too big (specially if like me, you have switch the capacitors to bigger ones). Also the switching frequency is...
by lqbweb
Apr 28 2018 5:08am
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3930
Views: 348926

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

yes, I understand it is meant to be a resistor divider to drop the voltage, as the max voltage of the lm317 is already 40volts, but why is it going that net to the output, and not to ground. I still dont understand how can that possible work (it clearly does ehehe). I will post the schematics of my ...