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  1. M

    Experiences with18650 li-ion batteries from chinese brands (BAK, EVE, DLG)?

    I know certain chinese brands such as ultrafire have a very bad reputation but i was wondering if better known chinese cell brands (of which products are sold by reputable sellers such as batterybro.com) such as DLG, EVE and BAK are any good. The cost for similar cells from brads such as...
  2. M

    BMS destroyed my battery?!

    @fatty sorry if I didn't make myself clear earlier: I did in fact test all individual cells in the pack for capacity, however I did not test them for internal resistance.
  3. M

    BMS destroyed my battery?!

    Thank you to everyone for their input/replies, highly appreciated! @ Goatman Regarding charging to 4.2 volt. I agree this is not good practice since it reduces cycle life of the cells ,however I highly doubt that in my circumstances (only 5 charge/discharge cycles after having built the pack...
  4. M

    BMS destroyed my battery?!

    Interesting suggestion, I am willing to try but I don't quite understand how that would work. I was assuming all cells in all of the seven parallel packs that are at or close to zero volts were trash/non recoverable. Could you please explain how cells which are at 0v or close to 0v could go up...
  5. M

    BMS destroyed my battery?!

    @john61ct please correct me if I'm wrong but I think that the high voltage cutoff in the bms should still come into play in some cases even when charge voltage is set correctly: example: let's image a really badly balanced pack, let's say 19 of the twenty parallel groups are at 3.5 volts and 1...
  6. M

    BMS destroyed my battery?!

    @Goatman isn't 4.2 a normal maximum voltage for an 18650? I thought 4.2 or 4.25 was acceptable as maximum voltage. It could perhaps still be that the bms overcharged the cells a little but that shouldn't cause the cells to die in only 5 cycles I think.
  7. M

    BMS destroyed my battery?!

    @john61ct I capacity tested each cell in the pack. Minimum capacity 1850 max capacity 1950.. most of them approx 1900. I made sure to capacity match the cells so that the capacity of each parallel group was approximately equal . I also checked initial voltages of each cell before checking their...
  8. M

    BMS destroyed my battery?!

    Hi, I recently built a 20s17p battery pack for my ebike using second hand samsung ICR18650-22P Cells (2200mah capacity when new). The issue: Since building the battery i have cycled (discharge-recharge) it approx 5 times, up till a week ago all went well, voltages were as I would expect, when...
  9. M

    Controller (reverse) shunt mod?

    Can a shunt mod be performed in reverse; as in: make the shunt thinner such that max amperage drawn by the controller is less? my controller is capable of 150Amps (DC battery current) but my current battery can only handle 70A (will upgrade in the future). I would like to make the shunt in the...
  10. M

    BLDC Controller recommendations (72v nominal, >=150A peak DC Amps)

    I am looking for suggestions for a good quality (reliable) e-bike (BLDC) controller to replace my current controller. Preferably (but not a necessity) with flux-weakening and regen (or at the least e-brake) functionality. Battery voltage= 72v nominal (could upgrade but would need new BMS/would...
  11. M

    'unlock' ASI BAC 4000? (Surron controller version)

    I am looking to buy a secondhand ASI BAC 4000 controller but the seller tells me this controller has been set up for a surron battery (60v nominal)('Rated system voltage'=60v). My battery is 20s li-ion (72v nominal) and I was wondering how to change this setting, if it is possible, how...
  12. M

    Sabvoton 72150 controller low top speed issue

    @ john61ct You are most likely right regarding the clones. My comment regarding QS motor was more of an assumption..
  13. M

    Sabvoton 72150 controller low top speed issue

    The controller now also appears to have 'died' :lowbatt: ... was test riding the bike under normal circumstances, max DC battery amps set to 70, was riding at top speed for approx 50 seconds when the issue started (had reached top speed 4 times before without any issues during the same test...
  14. M

    Sabvoton 72150 controller low top speed issue

    I have also tried that before (speed limit set to "no limit" mode and nothing connected to speed setting/3 speed wires).. same result :/ I've asked QS motor (company that owns sabvoton) but no answer yet..
  15. M

    Sabvoton 72150 controller low top speed issue

    I tested with 120A mid throttle current(standard setting), low speed at 70% (max percentage it would allow), mid speed at 100%, "high speed" wire connected to ground, internal speed limit at 100%, both in "boost" mode and in "3 speed switch" mode. Still the same top speed unfortunately... :/
  16. M

    Sabvoton 72150 controller low top speed issue

    @Santacruz unrelated : Are you using e-brake on your controller? If so are you using an e-brake throttle or a switch? How did you manage to get it working? Thank you!
  17. M

    Sabvoton 72150 controller low top speed issue

    @ Jonno I have tried (connected high speed wire to ground) but it made no difference to top speed (both in "3speed (switch)" mode and "boost" mode)...top speed still 66kph unfortunately
  18. M

    Sabvoton 72150 controller low top speed issue

    @Jonno I will try that. I don't think it will help since when I had the speed switch connected and when the switch was in high speed mode the speed wasn't any higher than without the switch connected. Thank you for the suggestion though, I will try and let you know! Available settings for...
  19. M

    Sabvoton 72150 controller low top speed issue

    @Jonno Yes. I have made a drawing of all the connections/wires because it is much clearer than a photo (many wires in a small space so hard to see).. Please take a look and let me know if there are any questions:
  20. M

    Sabvoton 72150 controller low top speed issue

    @jonno it did not come with a screen. I asked the seller and I am quite sure this version is not compatible with a display (if it is compatible it did not come with one). I am using a pc to connect to the controller via USB. I can also connect to the controller via bluetooth using an Android app.
  21. M

    Sabvoton 72150 controller low top speed issue

    @jonno no the speed switch is currently not connected. When speed switch is connected the highest speed setting reaches the aforementioned speed of 66km/h (loaded/on road speed). The other speed settings only limit the top speed further..
  22. M

    Sabvoton 72150 controller low top speed issue

    The issue is with the top speed I am achieving (66km/h max with "max DC battery amps" set to 70A (@72v nominal)), it is lower than what I would expect to achieve at this voltage. I am using a Suringmax v3 motor rated for 3000W nominal power (4T winding) which should achieve a speed of approx...
  23. M

    Stromer moter will do walk assist only

    What type (from which version of Stromer) is the motor? Opening the motor is indeed quite a task, here is how I do it: 1) remove rim/spokes (separate them, one side is longer than the other side) 2) Use a "bearing puller" which you hook around the edge of one of the motor halves (see image...
  24. M

    Sabvoton 72150 controller low top speed issue

    @Jonno Sorry, it was indeed a typo. Thank you for pointing it out. What I meant to say: " increased minimum throttle voltage to "1.2" And thank you for the info regarding phase amps :thumb:
  25. M

    Sabvoton 72150 controller low top speed issue

    EDIT:It was a typo indeed, I meant to say " increased minimum throttle voltage to "1.2" ". Thank you to Jonno for pointing it out Initially, the minimum throttle voltage setting in the controller software was set to 1.1 volt and seeing as my throttle's output voltage (on the signal wire) when...
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