BMS wiring

[Sutty86]

Received second BMS after frying the previous one , this one has no wiring diagram and has on one side 2 x B- and on the opposite side 2 x C-
I also have a b+ label on the board but a different soldering base different to the others.

 

[Deleted member 4366]

Don't forget that your multi-pin might not be right. You have to look at the markings on the board (B0, B1, etc) and ensure that they match what's on the connector. They're sometimes reversed and often don't match on the first and last pins.

 

[Sutty86]

Yes I will pull the plate off and have a look,
Is it possible just to have the charge lead and discharge lead on one connector.
I only have 12awg currently also will that suffice

 

[Sutty86]

This is the one that smoked on me ,

 

[Deleted member 4366]

12g wire is OK up to around 40A. You can use thinner wire for the charge leads.

I can't understand what you mean about the charge and discharge on the same connector. The charge wires go to the charge socket and the discharge wires go to the discharge terminals. How else can you have it?

 

[Sutty86]

Sorry I watched a YouTube video and the guy had a xt90 for discharging and a xt60 for charging ,
I just wanted to use an xt60 I have on and and is it for charging and discharging from the BMS.
Anyways I've managed to sort it.
Thanks

 

[Sutty86]

Okay all wired up charger is 58.8v 2amp Chinese unit,
Charger turned green and pack is showing 57v dropping from 58.8v(whilst on charge)
Should I be worried about this , bike has been fine with no BMS past week,monotorimg voltages and only doing short trips

 

[Deleted member 4366]

Something like 0.05v per cell-string would be normal drop due to bleed resistors balancing, so 14S would be 0.7v drop and 15S would be 0.75v.