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  1. C

    Regenerative braking with 2 batteries

    Have you found out if these hailong batteries are shipped with a common port (2 wires) or seperate port (3 wires) BMS? I'm looking to buy some of these second hand as a range extender. But only if they have a common port BMS. Otherwise it's too impractical
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    I just want to voice how happy I am with this firmware. Especially after reading the criticism from a certain user. I've been running this firmware on my 18 mosfet kunteng controller for the past >5000km, and I couldn't be happier! It has been extremely reliable, even clocked to +-3000W peak...
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    Absolute best 18650 (cycle life, DCIR)

    A couple years ago, after some extensive research, I went for the Sanyo GA cell for my 13s9p pack. While it held up okish, the capacity loss and dcir rise has been noticeable. Or at least more than I expected from the 4.0-3.4v cycles. I clearly could have chosen far better cells. I saw some...
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Happy to hear FOC seems to work :) My bms has a calibrated ammeter which unfortunately reports values ±50% higher than the controller reports. I'll map some values on my ride to school today. Aside from the high consumption, it's an excellent commuter! Good to hear. At least my hardware is...
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    That's the brand indeed! Thanks for sending me in the right direction! I'll try finding the correct datasheet. But I'm afraid I'll have to leave the resistor as my phase current is currently set at 140amps. I did indeed! Sometimes there is a nice waveform, sometimes there isn't, not sure what...
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    I seem to have a different sensor. The markings I seem to spot are: A 750 1932 865A For some reason I feel no difference when it comes to noise and power consumption when I disable "motor angle correction". Probably means FOC didnt work from the start, explaining my poor efficiency?
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Hi! Just wondering which settings I could play around with to attempt to improve efficiency. Right now the power consumption sits at 14-16amps (700-800w) at 35km/h. I average between 23 and 26wh/km, which is rather high compared to my previous speed-pedelec which averaged 12wh/km at similar...
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Walk assist turns out to be a nice solution to my 'departure from standstill' issues! I set the walk assist current target to 60 instead of 10 in ACAsetpoint.c. If someone is interested, my code change will set the target power for walk assist to ±500w and limit the speed to 20km/h (to make it...
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Hi stancecoke! I was wondering if this is still a thing, I have been using this software on my daily commuter for a couple months and 3000km. It's all flawless!! Except for the fact that start from standstill is impossible (especially uphill) with my 60-11 gear ratio (when I'm not able to...
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    This firmware runs on all kunteng controllers. I think they all feature the same microprocessor (STM8S105C6T6?) I don't think lcd8 is supported, but if you're not new to programming you could probably add support ;)
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    I would try fixing the issues with your current controller instead of buying into a new system. There are loads of threads about you bafang system, and from experience, I can tell you it's pretty neat! If you really want to throw another 80$ into your low power setup, you could buy any kunteng...
  12. C

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

    Added 14 to the code, it works great now!! Thanks a lot! Not sure how accurate the wattage is compared to kunteng software, but it seems to run rather efficiently compared to the stock firmware, so that's fantastic. Where the controller disappoints is the voltage regulator for the mosfets...
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Not sure why I thought it'd be 2400 baud. Here it is again at 9600 baud. I logged from startup:
  14. C

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

    Hi, I logged the uart message using Hterm, as I saw you recommended that in another post. Not sure if you're interested in seeing the logs? best regards, Inse
  15. C

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

    Both values are correct and calculated using the Tq sensor manual ((x/5)*255). I fixed the floating point value! Motor is still braking when pedaling slowly. I'll expriment with some values tomorrow. Thanks!
  16. C

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

    Can't you just monitor the voltage on the brake sensor cable using an arduino nano and some high value resistors? Or even connect a logic level mosfet in series with a 10k resistor directly to it? Seems a lot easier than messing with the code
  17. C

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

    Thank you! The most important part is getting a donor S-pedelec (I used a broken bulls green mover). Then find a good insurer (enra). After this throw some bullshit story about how your motor broke down and the manufacturer is bankrupt (it's true :lol:). Then nicely ask them if it is OK if you...
  18. C

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

    I honestly bought this kunteng controller just so I could use this project, and I must say, I'm super impressed! My setup: - 18mosfet controller - ±2000w direct drive hub motor - lcd3 - erider t9 torque sensor There are a couple things still beyond my knowledge though: - The lcd3 display...
  19. C

    Small freewheel compatible with 10 speed shimano derailleur?

    Hi, Recently I bought the pasion ebike kit from China, I thought it came with a 7 speed freehub. So I could just slide (part of) my 10 speed gears in the cassette. But it turns something like a freewheel exists too :lol: So now I'm stuck with this shitty system, unless I buy a new motor...
  20. C

    Smart BMS incorrect voltage reading (any fuses/ diodes?)

    Hmm yes, I suspected bad wiring too, but i think I can rule that out. Here is a picture of every connection u measured. From right to left: 4.1v 8.2v 12.3v 16.4v 20.5v 24.6v 28.7v 32.8v 36.9v 41.0v 45.1v 49.2v So I guess the problem arises somewhere after that point, in the bms?
  21. C

    Smart BMS incorrect voltage reading (any fuses/ diodes?)

    Hi everyone, I couple days ago I received the famous smart BMS by LLT power. It worked flawlessly for a day, but after tidying up the balance wires (hot gluing and such), two cell readings are way off. Cell6 reads 47mV and cell7 reads 5.8v. And yes, I was stupid enough to leave the BMS...
  22. C

    bosch batteries

    From the Netherlands? It's actually possible to legally drive 45km/u with a self build bike, you just gotta find a speed pedelec frame with registration. Then you want to keep the power within 20% of the original power and you'll be fine!
  23. C

    Bionx battery without BMS cell replacement

    I would put a cheap bms in that battery. Bionx should've never put that to the market.
  24. C

    Controller recommendations (torque sensor + off road mode)

    Hi all, I'm building a street legal 'speed pedelec'. The frame I bought is registered as a 500w bike with a top speed of 45km/h. In the Netherlands, torque sensors are obligatory, top speeds are limited to 45km/h and throttle-only speed is limited to 20km/h. In cities, we have to drive on the...
  25. C

    Bulls green Mover E45 Conversion

    Hi! I had the same idea as you had, and after having a Marktplaats ad up for a couple months, a week ago someone finally sent me a message. Believe it or not, the guy proposed me a bulls e45 with a broken motor!! The same exact bike! This is just too coincidental, I'm located in the...
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