Let’s talk about the underpowered stock controller on the BAFANG BBSHD

Let’s talk about the underpowered stock controller on the BAFANG BBSHD - Electrified

As ebike riders, we’ve all been there. You’re out on a ride, trying to enjoy the scenery and the wind in your face, when all of a sudden your motor starts cutting out. You check the battery display and see that you have plenty of juice left, so what gives? The answer, more often than not, is an underpowered stock controller.

If you’re riding a bafang bbshd with a stock controller, chances are you’ve experienced this issue firsthand. And while it’s undoubtedly frustrating, it doesn’t have to be a dealbreaker. In this blog post, we’ll take a look at what causes this problem and some potential solutions.

What Causes an Underpowered Stock Controller?

There are two primary causes of an underpowered stock controller: heat and voltage sag. Let’s take a closer look at each one. 

Heat: As you may know, controllers generate heat when they’re being used. This is especially true of stock controllers because they often don’t have adequate cooling solutions. As heat builds up, it can cause the controller to start cutting out. This is why you may notice that your motor starts acting up after extended use or on particularly hot days. 

Voltage Sag: Another common cause of an underpowered stock controller is voltage sag. This occurs when the battery voltage droops below the minimum operating voltage of the controller. When this happens, the controller will reduce power to the motor in order to protect itself from damage. Unfortunately, this also means that you won’t be able to ride at full power until the battery has recharged itself sufficiently. 

Potential Solutions

Now that we know what causes an underpowered stock controller, let’s take a look at some potential solutions. 

1. Use a Lower Gear Ratio: One potential solution is to use a lower gear ratio. This will make it easier for the motor to spin and generate less heat in the process. Additionally, it will also make it easier for the motor to maintain power at higher speeds without overloading the controller.

2. Upgrade Your Controller: If you find yourself repeatedly having issues with your stock controller, it may be time to upgrade to a better one. There are plenty of aftermarket options available that are designed specifically for the bafang bbshd motor.

3. Use Less Power: Another potential solution is to simply use less power. If possible, try riding in Eco mode instead of Boost mode. Additionally, you can also try reducing your max speed setting in order to give the controller some additional wiggle room.

4. Keep Your Controller Cool: As we mentioned earlier, heat is one of the primary causes of an underpowered stock controller. So if you can find ways to keep your controller cool, you may be able to avoid or mitigate these issues altogether. One way to do this is by adding additional cooling fins to thecontroller housing (if possible). Alternatively, you could also try mounting your controller in front of your battery instead of on top of it which will help dissipate heat more effectively. 


Riding an ebike should be fun – not frustrating! And while an underpowered stock controller can certainly put a damper on things, there are ways to work around it or even fix it entirely depending on your situation . Hopefully this blog post has given you some insight into what causes this problem and some potential solutions that you can try . If all else fails , remember that there are plenty of great aftermarket options available that can address these issues once and for all . Thanks for reading!

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