Recent content by RichardT

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...

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...

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...

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...

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

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...

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...

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...

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...

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...

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...

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...

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.

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...

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