how do I identify my controller and motor

potna

10 mW
Joined
Jun 26, 2022
Messages
27
first time poster, been lurking around since i first built my bike in fall of 2021

anyways, the controller was purchased from amazon and labled as:
yuandai
84v 80 amps
3kw continuous

here is a link to what i purchased:
https://www.amazon.com/gp/product/B09FHHZ9VM/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

the manual that came with it is the worst translated material i have ever read. maybe i should upload a picture of the board or something?

anyways i am trying to finaly learn about basics such as regen braking, which the seller says it doesnt have, but it definitely does and it worked without modifying anything.

the motor is stamped 3kw, but the seller on ebay said it was 4kw, which i am not unhappy about, in fact i love it, but i want to know more specs such as the kv rating the windings. i know it has 45h magnets and requires 155mm rear dropout to install and its nominal voltage is 72v and has an rpm of 840.

link to the ebike kit, but i upgraded the controller see above:
https://www.ebay.com/itm/274415256653

i built this thing to ride 54 miles round trip with zero pedaling using 3kwh of power, and it does this just fine, but i want to know more, much more.

any input would be appreciated.
 
potna said:
the motor is stamped 3kw, but the seller on ebay said it was 4kw, which i am not unhappy about, in fact i love it, but i want to know more specs such as the kv rating the windings. i know it has 45h magnets and requires 155mm rear dropout to install and its nominal voltage is 72v and has an rpm of 840.

kv is rpm per volt.
 
of the controller? that i can do easily as i have a spare. the motor will require a great deal of work to remove
 
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