Bicycle that turns off after only a few kilometers of use

[Jay-Cee]

Hello everyone!
I own a fatbike equipped with a 750W motor and a 48V / 25Ah battery. It has 3 speeds (via the throttle): 1- 15 km/h max | 2- 30 km/h max | 3- 40 km/h max. The assistance (PAS) blocks me at a max of 23 km/h.

For some time now, when I use my bike only with the throttle "wide open" in speeds 2 and/or 3 (speed 1 not tested), it suddenly turns off after about 2.5 km. The box where the controller and battery are located does not show signs of heat. However, I can restart it immediately and continue on my way, then if I continue to ride with the throttle "wide open" it cuts out again after a few kilometers.

At first I thought it was coming from the battery, it has been checked and 5 cells have been rebalanced but the problem persists.

Would anyone have an idea of what is happening? Or could help me establish a diagnosis to solve my problem. Thank you in advance for your feedback.

 

[E-HP]

It looks like it's great! How does it work and how should it be physically installed?

There's a couple of buttons to review the stored info and for resetting. Pretty straightforward. I got a piece of ABS plastic and cut a hole for the display to fit, then mounted that on my bars. That was on the first iteration of my bike, so I couldn't find any close ups, but you can see it below my LCD3 screen on my bars on this pic. I think there may have been some hot glue involved in mounting it there lol.

 

[Jay-Cee]

There's a couple of buttons to review the stored info and for resetting. Pretty straightforward. I got a piece of ABS plastic and cut a hole for the display to fit, then mounted that on my bars. That was on the first iteration of my bike, so I couldn't find any close ups, but you can see it below my LCD3 screen on my bars on this pic. I think there may have been some hot glue involved in mounting it there lol.

Yes, I see it. Thank you I'll try to see how it works.

 

[E-HP]

Yes, I see it. Thank you I'll try to see how it works.

Think it through before you buy. The shunt must be in series with your battery, which will require some cutting and crimping/soldering. I used the 100A version of that meter because the shunt had bigger lugs for the battery cable connectors. Similar to the one neptronix linked; you'll need to be working with the battery level voltage, so you have to be careful.

 

[Jay-Cee]

Think it through before you buy. The shunt must be in series with your battery, which will require some cutting and crimping/soldering. I used the 100A version of that meter because the shunt had bigger lugs for the battery cable connectors. Similar to the one neptronix linked; you'll need to be working with the battery level voltage, so you have to be careful.

As for crimping and/or soldering, I'm not worried about that. I have what I need and I'll already be doing some to adapt my controller. But it's the practical side that I'll need to master to avoid any issues. In any case, thank you.

 

[Jay-Cee]

As for crimping and/or soldering, I'm not worried about that. I have what I need and I'll already be doing some to adapt my controller. But it's the practical side that I'll need to master to avoid any issues. In any case, thank you.

With which unit of measurement (Volt, Ampere, Watt, Ohm) should I look to test the wear of my cells? in order to see if my battery is tired