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  1. R

    Motor power restricting

    Dear John in CR Thanks for your response. Pardon my ignorance, what is EE type? A hub motor has a rating engraved on the shell or casing . So, that is the rating of the motor that i believe my gov is referring to as one of its criterias. I believe this rating is in terms of the copper...
  2. R

    Motor power restricting

    Hello Drunkskunk Thanks for responding to my enquiry . 1. Yes, its for legal reasons. I live in a totalitarian state. You are forced to comply and rules are very strict. 2. When you say a 250w motor peaks out at around 700 watts, do you mean the physical rating of the motor , be it a brushless...
  3. R

    Motor power restricting

    Hello Experts If my motor is rated at 350w, how can i limit the power to 250w ? Given the voltage of the battery and motor is 36v, I think one way , without changing the motor, is to limit the Current. Is there a way to limit the Controller to output max 250w ? Kindly could you give me some...
  4. R

    Throttle intermittently not responding

    I like it when you say halls either work or they don't. I am really hoping its loose connections. Seems there is some chance its not due to faulty halls. If halls faulty, i would have to open up the motor casing!!! :shock: :shock: Thats why i asked what is it like if a hall sensor fails. It...
  5. R

    Throttle intermittently not responding

    Thanks very much. I will do more tests to see if the problem is repeatable.
  6. R

    Throttle intermittently not responding

    I am keeping my fingers crossed that its due to poor connections. Due to oxidation ? Can brass oxidise? The wire ends seems to be soldered to brass colored pins or long flat and thin plates that go into a molex type connector. Will try using a metal brush and give the connections a good brushing...
  7. R

    Throttle intermittently not responding

    Yes, thats exactly what i felt! I just did some more tests : 1. Hall wire voltage : Red and Black is about 5V. Looks ok. 2. Measured the hall sensor voltage levels , rotating wheel in reverse direction. Blue and Black : between 0 and 5v. Green and Black : between 0 and 5v. Yellow...
  8. R

    Throttle intermittently not responding

    Hello Experts I have not yet decided to replace my thumb throttle and continued to use the ebike with the intermittent problem still unresolved. I discovered that whenever the motor stops turning when i throttle, all i have to do is to come to a stop and push the bike in reverse for an inch...
  9. R

    Ebike vs Laptop battery pack

    That's what i mean. 1 circuit board for all the cells instead of 1 circuit per cell eg. the regular 18650 protection circuits on the negative pole of the cells. This is what leads me to conclude that there is no need to buy protected cells. Its maybe more practical or important for specific...
  10. R

    Controller current rating and Battery discharge rate

    Thanks Ykick. I apologise if my posts seem about the same thing. But I honestly see them as separate issues. They are related only because they are all about ebikes and batteries. This thread is to find out what battery specification is required for my controller. I bought 2600 mah cells (2C...
  11. R

    Controller current rating and Battery discharge rate

    Hello Experts I am trying to source for lithium cells 18650. There is a parameter called the max current discharge rate. Larger capacity cells tend to have lower discharge rates and vice versa. If my controller is rated at 13Amps max current, does it mean i should get a cell similar max...
  12. R

    Throttle intermittently not responding

    Hi Bro, I tried the 2 methods you advised and learnt some new things! Tests done: 1. Using my spare e-scooter throttle (un-used, sitting on the shelf), there was no intermittent behavior. Works normally and even better throttle response than existing one. 2. After i reconnected to the spare...
  13. R

    Ebike vs Laptop battery pack

    What i meant was , the bms or whatever circuit provided is at pack level and not cell level. I am just curious as to why the industry practice is so. I am planning on using unprotected cells (cheaper) and then monitor these with single circuit instead of one for each cell. thanks.
  14. R

    Ebike vs Laptop battery pack

    Hello Experts Laptop battery cells do not come with individual cell protection circuits. It uses 1 circuit for all the cells. Why no balance charger? Why are laptop batteries different than battery packs that uses balance chargers and cells that all have protection circuits embeded in them...
  15. R

    Throttle intermittently not responding

    Hi Dogman Dan Thank you very much for your kind advice. Will try it out and let you know. Cheers.
  16. R

    Throttle intermittently not responding

    Hello Experts I have been using my new ebike for about a month on a daily basis. Yesterday, i begin to experience an issue of motor not spinning when I press the throttle while riding. I let it wait for a minute or so and the throttle effect is back again. Else, even though the power indicator...
  17. R

    How to check controller voltage ratings

    Hi Nobuo Could you kindly elaborate more on the voltage parameters that can be checked by opening the controller case? Thanks very much.
  18. R

    How to check controller voltage ratings

    Hi D8veh I have uploaded the photo. Thanks.
  19. R

    How to check controller voltage ratings

    Hi Brumbrum Thanks for your comments. Yes, its seems to be due to LVC. I used my 36v battery charger to directly power the controller and motor runs! The charger gives about 42v. At that time when i tested with my battery pack, the voltage was 41v. So, seems clear that the controller was only...
  20. R

    small ebike controllers

    Hi D8veh Attached are photos of my controller and battery which is about 7cm thick (not visible from photo). Hope you can advise further. Thank you. regards Richard T :D
  21. R

    small ebike controllers

    This controller of mine has 3 screws shown on the outside of the controller casing. So, i think only has 3 FETs. Can I replace these FETs with more powerful FETs to keep it cooler? If so, is there any specific FET I can use to replace the existing FETs? Thanks so much. Regards Richard T
  22. R

    small ebike controllers

    Hey bro, that was my old controller and old motor kit which i never used due to product issues. This post is not double posting. Hope there is no misunderstanding. Thank you. Regards Richard T
  23. R

    small ebike controllers

    Hello Experts I bought a mountain bike type of ebike having a panetary-geared brushless hub motor rated at 36v 350w. The controller is like a big match box. Very small, I estimate it is like 10 cm by 6cm. When i first rode it on a hot afternoon, after 2 km, the controller casing felt hot. I...
  24. R

    How to check controller voltage ratings

    Hello Friends! Thank you so much for your responses! I truely appreciate your comments. The 36v battery pack is at least 36v. So, I doubt its a battery pack voltage level issue. I also believe its due to software programming to limit the controller to operate at 48v as commented by one of...
  25. R

    How to check controller voltage ratings

    Hi Experts I have a controller that i was sold to be used for 36V hub motor. I plugged it into the 36v hub motor and powered it up with 36v battery pack. It does not run. I changed the battery pack to 48v, it runs! How can i check for myself what is the ratings of the controller i bought? I...
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