Turbo boost on Lishui controller

[kenuser]

Hi,

I have two folding bikes equipped with 36V 15A Lishui controllers, XMUS XF08 250W sine wave sensored motors and display from APT (UART protocol).
As I made new batteries with about 60A continuos discharge, I would like to power little up the torque to have more assistance on hills.
Asked XMUS local dealer how many Amps can handle the XF08 motor they reply that up to 17A peak will be ok.
I tried to do this via software by this method but I'm scared that the controller is read-out-protected and so will causes the firmware to be deleted.
So, may be hardware method will be more safely. I read that by lowering the resistance of the internal shunt of the controller the current limit will be increased.
As I would make a push botton in parallel with the shunt, my question si how thick should be the cable to lowering the resistance of the shunt so that not exceed 1-2 Amps power up.
Thank you

 

[E-HP]

So, may be hardware method will be more safely. I read that by lowering the resistance of the internal shunt of the controller the current limit will be increased.
As I would make a push botton in parallel with the shunt, my question si how thick should be the cable to lowering the resistance of the shunt so that not exceed 1-2 Amps power up.
Thank you

Just to understand what you are planning, are you saying that you want to add another shunt in parallel with the current one(s) that parallels the two when you push the button? If so, then why do that instead of just beefing up the existing shunts (why do you need a button)?

 

[kenuser]

Hi,

your observation is correct, but I don't have full confidence the XF08 can hold more than 16-17 amps. The controller have only 6 mosfets, if I beef up the existing shunt too much, the controller (or the motor) will burn. For this reason I thought to parallelizing the shunt so as to obtain a reversible mod. The purpose of the button would be to increase the power only when necessary so as to keep the temperatures under control. I think I will have to find the value of the ideal min resistance in an empirical way.