Choice of the controller

[Jay-Cee]

Hello everyone,

I own a Fiido T1 Pro cargo fatbike, weighing 37kg, equipped with a 750W motor and a 48V 25A controller with 12 MOSFETs. Due to a degradation of my controller, I replaced it with a generic model of unknown brand (48V 25A, "SQUARE wave" type, 9 MOSFETs) purchased on Aliexpress: https://fr.aliexpress.com/item/1005004870053287.html.

However, during trips of about 10 km in the city on flat roads, without stopping, at a maximum speed of 28-30 km/h and without carrying any load, this new controller overheats and stops. I want to replace it with a Kunteng model (48V 25A, "SINE wave" type, 9 MOSFETs) available here: https://fr.aliexpress.com/item/1005004045976054.html.

Do you think there will be a significant difference in terms of performance and endurance? Or is it better to buy the original controller which has 12 MOSFETs?

Thank you for your advice.

 

[PCeBiker]

You could get a 30 amp Sinewave KT Controller if you have the physical space to install it.
This one has 12 mosfets and waterproof connections.
There are SM plug versions too if you need SM connectors.

https://a.aliexpress.com/_mLQ04Cs

 

[Jay-Cee]

You could get a 30 amp Sinewave KT Controller if you have the physical space to install it.
This one has 12 mosfets and waterproof connections.
There are SM plug versions too if you need SM connectors.


View attachment 180000

https://a.aliexpress.com/_mLQ04Cs

I looked into switching to a 30A, but unfortunately, I don't have the space. So, I have no choice but to go back to my original controller, is that correct?

 

[PCeBiker]

As far as I remember, once a KT Controller goes over 25 amps, the Controller gets bigger.

There may be some other type of controller available with 12 MOSFETs in a smaller box.

Your ebike probably isn't the only ebike with a Controller like yours.

 

[Jay-Cee]

As far as I remember, once a KT Controller goes over 25 amps, the Controller gets bigger.

There may be some other type of controller available with 12 MOSFETs in a smaller box.

Your ebike probably isn't the only ebike with a Controller like yours.

That's right! Controllers over 25A are about 170 cm long, and those over 40A are about 230 cm long.

I tried to search but couldn't find anything. If you come across any information, please don't hesitate to send it to me.