Potential Problem with Controller

[Ltc433]

Today I was cycling and the power left the bike. The voltage dropped from 50V to 21 to 31v, then it jumped around and then the display turned off.

1. I took the battery out and put the battery in an identical system, as I bought 2 kits which are exactly the same. The second bike worked fine.

2. I put the battery back in the other bike and it showed 52v. I disconnected everything and then reconnected everything. When I connected the controller to the battery. The LCD came on, shows 33v then 29V then turned off. I then checked the power of the battery and it is 52V.

3. I then checked the battery mount and then used a watt meter to check the battery. It shows 52V.

4. I then used the watt meter and the controller. When I connect the watt meter it shows 52V. If I then connect the controller it drops to 33v-29V and turns off. The watt meter is mounted permanently.

5. I thought it might be broken wiring problem but it is strange the voltage drops to around 30v rather than going to zero or or full.

Is the controller not working? I have the battery on charge and will test with a full battery at 54.6v to see if it makes a difference.

Are there any other ways to test? Something I have missed?

 

[docw009]

Sounds like you only have one battery? If the second bike had a battery, you didn't try it in the bike that stopped working. Did the battery run the other bike?

Do you have two displays too? Can you swap them?

 

[Ltc433]

I have only one battery at the moment but i can make another one up. I was going to anyway.

I found that moving the battery around slightly made the voltage jump around. If I hold in a certain position it shows 53V and the controller powers on. So it looks like a loose connection between the battery and the mount. I hope it isn't the battery itself. I've cleaned the contacted in the battery and the mount. The negative socket on the batterywas black but one the positive I can see the metal clearly. Perhaps the battery negative terminal socket is too wide and needs to be pushed back in?

I'll make up another battery tomorrow and retest.

battery and mount

https://imgur.com/a/R7FitA7

I can't really swap displays as its all wired in etc. I'm pretty sure its the battery and the mount.

 

[Ltc433]

Its definitely the battery mount controller and the battery. I removed the mount connector from the mount and connected it directly to the battery. At a certain angle it gives full power and if i move it slightly it reduces power. So Ill have to replace it i guess and perhaps the connector in the battery.

 

[Ltc433]

Does anyone know what these connectors are called? And anywhere I can buy them?

 

[Ltc433]

I figured it out. You can get a very small screwdriver and prise in the top of the metal edges of the in the female socket on the battery. That's where the connector had gotten loose over time. No problems now.