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  1. A

    How hard Q75 can be pushed

    @Jonca, first few points: 1. I have the throttle which make applying&measuring of power going to motor far more easier than PAS. 2. The KM5S appears to produce quite wobbly readings when the power is lower than 100-150W 3. On that Alu frame I have (fortunately or not) a steel fork, so I hope...
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    How hard Q75 can be pushed

    without failing of course... for short bursts of hill climbing power. I have Q75 (200W) interfaced to LSW-675 (7A continuous, 15A peak) with KM5S display which is capable of live measuring power in W, and also limiting current within 1-15 A adjustable range. Some easy math: 7A x 36V = 250W...
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    Pairing Q75 with LSW-675 NOT S06P

    WARNING: DO NOT USE S06P controller with Q75 Changed the S06P to LSW-675 and it works flawlessly with Q75. BMS battery is making false claims that S06P is compatible with Q75!!! Note about switching controllers. 1. Disconnected the sensors from S06P and measured voltages on connectors 2...
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    Pairing Q75 with LSW-675 NOT S06P

    Thanks Jonca! Feedback from you, including German website comments was what I waiting for. Will be ordering that LSW-675 controller, too bad that my existing LCD-S1 is not compatible with it. Regarding my conversion: I also wanted an ultra-light setup, hence the Q75, especially that I am only...
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    Pairing Q75 with LSW-675 NOT S06P

    The 214 is a correct # based on the available information. I have tried changing this number in increments of one in the range 204-224 and increments of 5 beyond this range. The only way to reduce stalling and horrible squeal is to reduce power by inputting a value well below 214. So my...
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    Pairing Q75 with LSW-675 NOT S06P

    From BlueMySky Battery. Why? I have the 201 rpm in a 20 inch wheel with S06P controller (plus LCD-1 S) which lose sync and thus power plus get a horrible squealing noise with high power at low speed. Just when I need torque to climb a hill! BIG problem. One solution to this when using a S06P...
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    Wiring of BlueMySky battery controller - solved

    SOLVED... Shorting 12.8V socket does indeed switch on power from battery to the output terminal. Good. But flipping the power switch also produced voltage of ~ 13V on terminal for the LED voltage meter of the battery. I have tested the LED meter and it needs full battery voltage - 4 green...
  8. A

    Wiring of BlueMySky battery controller - solved

    Soldered the new PCM to my old battery 1. Battery is charging, charging stopped at 41.4 v, measured at the PCM, so far so good. 2. Found some old diagram of a PCM from a QUAWIN website (they do not make it anymore) see photo 3. The diagram is very similar to my board except for a few components...
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    Wiring of BlueMySky battery controller - solved

    I bought this product: https://bmsbattery.com/bmspcm/718-10s-lithium-bms-system-for-bottle-battery-with-5v-bms-pcm.html L-B36-10S/15A-1129 On a PCM there are TWO white connectors for TWO wires each Which(!) socket is for LED battery meter and which one is for the power switch? Picture of the PCM...
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    Are those two BMS fully interchangeable?

    save of course for USB output... https://bmsbattery.com/bmspcm/391-10s-lithium-ion-bms-for-bottle-battery-case-bms-pcm.html has PCM-L10S15-923 (A)+(B) https://bmsbattery.com/bmspcm/718-10s-lithium-bms-system-for-bottle-battery-with-5v-bms-pcm.html has PCM-L10S15-923 (A)+(C) #1. I have checked...
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    BMSB battery will not charge from 38.5V

    I got 11.6 Ah Panasonic bottle style battery https://bmsbattery.com/ebike-battery/734-36v116ah-bottle-ebike-battery-pack-with-charger-battery.html 1. When arrived, battery voltage was 41.5V and 4 segments on the capacity indicator were green. 2. After using it for a dozen kms or so voltage...
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    BMSB battery will not charge from 38.5V

    I told BMSB representative that there is a problem with the battery NOT the charger more than 3 weeks ago. After convincing them about that, they now want me to troubleshoot battery by opening the case. Every e-mail exchange takes 4-5 days so it might take till Christmas ;-( to resolve the...
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    BMSB battery will not charge from 38.5V

    It is impossible for any cell(s) to be fully charged at this point. The BMS MUST BE the culprit. I have offered to BMSB trying to charge with a different charger, and waiting now for their response as I do not want to be "blamed" for any damage. The other charger I have in mind has fully...
  14. A

    BMSB battery will not charge from 38.5V

    I connected a voltmeter 20 kohm/V to a charging port, (NOT discharge terminal) it shows voltage of 23.4V for a few minutes and than it jumps to the current voltage of the battery which is now 36.0V. It needs some very minor current to flow to show the full voltage. When I connected a digital...
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    Li-ion Battery Voltage vs State of Charge

    Assuming (!) that all batteries are very similar in parameters, you can use ONE 18650 diagram as an example. capacity vs voltage is highly current related Google it &check images...
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    BMSB battery will not charge from 38.5V

    Got response BMSB. Battery should charge at any time. A sliver of hope is gone. Bad battery management system must be the cause. (if the battery external switch is "fused" in the closed/on position, it should not interfere with charging of the battery as the switch is supposed to be in a such...
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    Q75 - loud(!) squealing noise with acceleration

    @d8veh What LCD do you have? I have LCD-5 and my P parameters are in the first post. Cannot input C parameters, do you know if LCD-5 will accept C parameters? Maybe this is the difference between our results
  18. A

    BMSB battery will not charge from 38.5V

    Can topping up be performed on this battery at any time OR the voltage must drop down below a certain threshold? Other info: 1. Yesterday, I used bike for few kms, current voltage without load 36.7, still no charging 2. Tested charger under the resistive load (lightbulb). It provides the...
  19. A

    Hidden Wire Brake Sensor always on

    You can solder both sensors if you wish... For me this did not make sense as I often use twist throttle with my left hand so I have HWBS on rear brake which I would brake first anyway. So I just have installed one sensor...
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    Q75 - loud(!) squealing noise with acceleration

    36V nominal, did not measure the A, have the power, V&A meter but do not want to change the wiring, YET ;-( Also, I have noticed that frequency of that crappy noise diminished when my battery voltage dropped from 41V to 38.5. The voltage of the battery was measured with 2 research grade meters...
  21. A

    BMSB battery will not charge from 38.5V

    I got 11.6 Ah Panasonic bottle style battery. This is the FIRST time I am charging this battery. When arrived voltage was 41.5V and 4 segments on the capacity indicator were green. After setting some parameters and testing the system voltage dropped to 38.5V and I have 3 green capacity...
  22. A

    Hidden Wire Brake Sensor always on

    See my thread https://endless-sphere.com/forums/viewtopic.php?f=2&t=81013
  23. A

    Q75 - loud(!) squealing noise with acceleration

    Reducing the P1 lowers the power by ~10-15% (my estimate). Also, the maximum speed, throttle only, dropped from 21.5 to 19 km/h. Considering low power of the motor such drop is not acceptable to me.
  24. A

    What controller do you use with Q75?

    I got S06P (with LCD-5) which has problems interfacing with Q75. (see https://endless-sphere.com/forums/viewtopic.php?f=2&t=81852) BMSB list ONLY one more controller compatible with Q75: 36Volts 250Watts LSW-675 Sine Wave Controller with King Meter KM5S LCD Display Do you know if anybody else...
  25. A

    Cheapo ebike volt / ammeter?

    On aliexpress.com you will have 10, 20, 50 A versions for less than 10 USD delivered. I got 20 A. You can make your own shunt by checking tables of resistance of wire vs diameter, but for a very accurate reading, you will need shunt with a little higher resistance than required and THEN solder...
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