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  1. S

    warning about ENERPROF.DE / ENERDAN battery&accesories

    Grin do a 'Trip Simulator' which I find reasonably accurate although some of the smaller roads are not shown on the map. You can use the Bafang BBSHD setting for your motor and hopefully you can plot your route. (select google maps) It is also possible to do a good test on a battery without...
  2. S

    warning about ENERPROF.DE / ENERDAN battery&accesories

    30 Km is a remarkable bad range for a 960Wh battery on a bike restricted to 25 Km/hr. Taking this alone at face value, your battery pack could well be not up to standard or have a bad or disconnected cell.
  3. S

    warning about ENERPROF.DE / ENERDAN battery&accesories

    The above quote from Chat gdp is very misleading in your case. The Bafang Ultra by default is typically set for a minimum voltage of 41 Volts as shown below to protect the battery so you probably need at least about 43 or 44v in the battery to get it to even work for a short journey or the motor...
  4. S

    warning about ENERPROF.DE / ENERDAN battery&accesories

    I wonder did they give you the right instructions as your battery is a 15S LiFePo4 and those instructions seem to be for Li-ion? By the way, there is a separate battery section in this forum so you might get better replies.
  5. S

    warning about ENERPROF.DE / ENERDAN battery&accesories

    Re. the bad packing, there are many complaints about customs/security open parcels and not closing properly. If that was my battery, I think I would turn down the controller power to 25 amps to have it less than the 30 amp BMS and try it out and see what range you can get from the full...
  6. S

    warning about ENERPROF.DE / ENERDAN battery&accesories

    I would be happier with a 40 Amp BMS so I would have some headroom as I think the M620 has a 30 Amp controller, so check if this is your case. The fact that the 30 Amp fuse did not blow doesn't really prove anything as a 30 amp fuse will often carry much more and possibly up to 60 amps for a...
  7. S

    Max Line and Phase Amps

    The extra current as such has nothing to do with 3 phase as extra current is also present with a single phase setups. The extra (flyback or freewheeling) current occurs mainly at the lower RPM range and is a result of the pulse width modulation (pwm). The whole motor system could be said to work...
  8. S

    Phase Amps to Motor Math

    I have found this diagram below explains how the controller and motor inductance combined can be compared to a buck converter to increase the motor current above the battery current. Its worth noting that the top three mosfets are subject to different stresses than the bottom three and that...
  9. S

    Custom length spokes and bending your own "J" end

    I have made many 'Z' bend repairs and they have never failed. Been able to make 'Z' bend spokes is a very useful skill for emergency wheel repairs. Its also possible to replace a spoke with a 'Z' bend without removing the wheel or freewheel. In this case its sometimes necessary to make the 'Z'...
  10. S

    The use of 12 gauge spokes on most hub motors

    I notice in this discussion that its not clear whether we are talking about front or rear hubs. I find there is a difference. Nearly all spoke problems (12g & 13g) I have dealt with have been on rear hubs. The only problem I have have seen on front hubs were spokes clicking at crossover that was...
  11. S

    TSDZ 2 torque sensor doesn't make the motor rotate

    As regards your two points above, the TSDZ2 does a calibration test every time you power up (with your feet off the pedals) because due to its mechanics, it accepts that there is some tolerance or variation between different individual torque sensors and due to wear.. So it can tolerate some...
  12. S

    TSDZ 2 torque sensor doesn't make the motor rotate

    I found grecoa's post below very helpful in how to check the torque sensor and note his te value is 78. Even with the custom software, the te value is well above zero at rest.(30) https://www.pedelecs.co.uk/forum/threads/help-please-tsdz2-problem.33106/#post-468104...
  13. S

    TSDZ 2 torque sensor doesn't make the motor rotate

    On my 36v Tsdz2 (2020 Pswpower, no mods or custom software), I checked the calibration of the torque sensor with a luggage scales and got a te reading of 92 and tei is 104 @5Kg, 122 @ 10Kg, 143@20 kg and 180 standing hard on the pedal (85Kg ?)
  14. S

    Inr21700-33j full capacity

    Another test below 4.2v to 3.0V. I made up a battery with 50 of these cells. In use, I notice there is very little left in them when they reach 3.3v. Samsung 33J - a 21700 Li-ion battery designed for Tesla
  15. S

    Brake failure resulting in airborne bakfiets

    I think moisture/water/vapor droplets in the air in tube can cause extra large increase in pressure with temperature. Another possible good reason for using nitrogen in tires which is normal I believe in formulae 1 cars (as well as 'Divvy' bikes etc).
  16. S

    Crack developing on ebikeling rim sidewall-- need to repair

    Re above, I often put on a thick pair of gloves and with both hands (a hand at each side of wheel) squeeze the opposite pairs of spokes. I then retention the wheel spokes as they loosen after this. I then repeat again (and again) and retention if necessary. This has worked for me with 14g spokes...
  17. S

    Aluminum Wire Wound Resistors for Load trials

    I usually put my load resistors into a bucket of water if necessary ( voltage was low 50 volts ) I am not sure about those particular resistors but there is a discussion here that might be of interest.
  18. S

    rear hub motor roadside flat repair

    There is a tube available by Gaadi that can be fitted without removing the wheel.
  19. S

    What makes these cheap Chinese chargers so dangerous?

    If I may add to what you said, most/many multimeters anyhow are only specified/guareenteed as accurate at best to about 1% plus one least significant digit. I think you would need a more accurate lab type instrument/meter or calibration reference voltage to measure more accurate than this .
  20. S

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

    Sorry, it does not have custom firmware.
  21. S

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

    It is indeed phase current. It circulates through the motor. Freewheeling/flyback current adds to the battery current and increases torque. As far as I know, at any moment, Phase Current=Battery Current + Flyback Current. Anyhow that my understanding. I have a 9 fet controller and it works great.
  22. S

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

    Dont forget that extra 'freewheeling/flyback' current over and above battery current is generated caused by collapse of motors magnetic field with PWM and this circulates through (usually I think) the lower set of 3 fets through the body diodes. Doubling up on these 3 FETs as say with a 9 FET...
  23. S

    Are BMS wires junky??

    Just a thought. Sometimes a light thin wire is better in this application in that if it does short, it will burn/fuse quickly and do less harm. I have used thin fibreglass sleeving that was useful as some of the balance wires had to cross over adjacent nickle strips.
  24. S

    Battery speed boost

    Your suggestion reminds me of the 'End Cell Switch' that was used on old 50 volt strowger telephone switch power supplies to boost the battery under load during power failures. Anyhow, it could be implemented something like below in your case but I'm not sure if its a good idea. It would be...
  25. S

    Dumb question: why are there e-power cutoff brakes at all?

    In Europe, there is also a requirement under EN15194 as quoted below. They may not be required with certain torque sensors as they may cut off the power quickly within 2 meters.
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