EUY S4 controller

[Promille]

Hi,

I have a spare controller for my euybike s4 so i opend it up just to have a look and maybe do a "shunt mod"

But i did not find any shunts or resistors that i am used to see?

Does anyone have a clue?



View attachment 363470

 

[amberwolf]

A shunt will almost certainly be between the battery negative input and the FET negative rail.

Does the battery negative trace go directly to the FET negative rail trace, or is there any place where there's a component between the two?

 

[Promille]

Ok, will have to investigate further and remove more of that gray putty.

Thanks

 

[Promille]

Thanks amberwolf, the shunts were where you said they should be.

 

[Promille]

So I added another resistor

 

[Promille]

The controller was rated for 23A so this should make it a 30A+ ish. I didn't have time to test the bike properly but it felt like it had bit more torque at take off.