Need Help with DIY eBike Project

Joined
Aug 10, 2022
Messages
2
Hello,

I am currently building my own budget eBike using a pulley drive train, and right now it's not working. I'm a beginner, so I could really appreciate some help!

Here are the parts I'm using:

Motor - https://a.co/d/5PQv0mw

Battery - https://a.co/d/dZzhDmS

Speed Controller - https://a.co/d/2lp1p6h - 24V

Throttle - https://a.co/d/bVKP6me

When I connected all of these electrical components and pulled the throttle, the motor sadly wouldn't run. As far as the drive train, I'm planning on 3D printing a motor mount and the motor/wheel pulleys. If somebody who knows what they are doing could help me, that would be awesome. Thanks!

Note: I am using Tom Stanton's video (https://www.youtube.com/watch?v=9rIIJbDkpN8&t=692s) for inspiration.
 
Hello,

I am currently building my own budget eBike using a pulley drive train, and right now it's not working. I'm a beginner, so I could really appreciate some help!

Here are the parts I'm using:

Motor - https://a.co/d/5PQv0mw

Battery - https://a.co/d/dZzhDmS

Speed Controller - https://a.co/d/2lp1p6h - 24V

Throttle - https://a.co/d/bVKP6me

When I connected all of these electrical components and pulled the throttle, the motor sadly wouldn't run. As far as the drive train, I'm planning on 3D printing a motor mount and the motor/wheel pulleys. If somebody who knows what they are doing could help me, that would be awesome. Thanks!

Note: I am using Tom Stanton's video (DIY Electric Bike) for inspiration.
 
You will need to give a lot more detail in order for someone to assist you.

My immediate comment would be that it's a tiny 5Ah battery and the motor will struggle to generate any real torque on a bike given they are much much heavier than skateboards...?
 
You can try below to get started your troubleshooting.
You must have a multimeter first. Any cheap one is OK.

Solution - You need to buy a display. Your brain power motor controller is now in OFF state even though you have connected it to the battery. You need a display to turn it on. S866 is a cheap but good display and works well with brain power motor controller.

Until your display arrives, you can try below and enjoy your DIY adventure.

1. Connect the controller to the battery.

2. Find the display connector, jump the utility and positive wires. This will turn ON the controller.

3. Now, in each connector, touch black negative lead of the multimeter to a negative connector and red positive lead of the multimeter to other wires.

4. Explore the voltages. Note that some will have 24V so don't touch with bare hand. Only touch with multimeter leads. Wear a glove for safety. Disconnect the battery as soon as you are done.

Share your findings here and we can enjoy together. 😉

Note :- Some controllers can work in a fixed gear, usually the 1st gear, when you short any data pin to ground. If that's the case, when you throttle, your motor will turn but you cant change the gears. But its sufficient for your testing until the display arrives. But my brain power controller doesn't work that way because its default gear is zero :lol: . So if you are also in the same situation, enjoy some netflix movies until a new display arrives. :D

Extra Info:- If you are curious how to communicate with your motor controller computer, it's using a protocol called UART. That's why the display connector has two data pins TX and RX running around 5V. Google more and you can keep learning. You might be able to create your own wireless display for the motor controller using an ESP32..... :flame:.

Power Consumption:- Your motor can consume 3000W as per the description. You have a 24V battery. So current is equal to 3000VA/24V = 125A. Its not practical and you need huge huge huge wires and super awesome battery. So your motor controller and display usually limit the current to 20A or 30A max. So 20A * 24V = 480W is the max power you can actually get. Your battery is 5AH but now you draw 20A. So your run time will be max theoretical 15 minutes. Ah just saw that your motor controller is 350W and 13A max. Hmmm.... your time to do the calculation :bigthumb:
 
Cybercat said:
Solution - You need to buy a display. Your brain power motor controller is now in OFF state even though you have connected it to the battery. You need a display to turn it on. S866 is a cheap but good display and works well with brain power motor controller.

Until your display arrive

The controller the OP linked doesn't support a display. It has a jumper in place of on/off, but a switch could be added.
 
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