LLT SmartBMS questions

[fessyfoo]

lil cross linking

@vegr0

Cant get an answer from LLT. i got their 10-17s bms. first time using it and i can’t get the settings to write anything other than 13s… You can see the extra cell group. its a 12s pack.

I followed the harness wiring correctly, stopping after the first 13 wires.
Any idea?

@ShutterShock

You did not follow the diagrams, you have to solder together a number of the leads to make it 12s. You should be able to get the diagram from the product page in a pdf

@vegr0

yea thats the issue, There is no diagram for this unit.

https://www.lithiumbatterypcb.com/product/little-size-36v-48v-60v-li-ion-or-lifepo4-smart-bluetooth-bms-with-40a-60a-80a-constant-current-for-10s-to-17s-battery/

Normally the first black wire is for battery -

then the first white wire hits the positive of battery -

then each wire hits the next positive terminal of every group. - I used a total of 13 wires for this 12 pack.

Which part did i mess up for this unit as it obviously isn’t wired the same as their standard 12s bms.

edit - i see now theres a text link hidden on the page that shows the diagram…

@ShutterShock

There is a diagram for it, you just posted it

It doesn’t have a 12s one, but it’s a reasonable assumption since all the others are like this, to think that 12 should be the last connection on the end (17)

Then 11 should combine 16, 15, 14, 13, 12, 11.

@glyphiks

It does have a 12s one

Search terms LLT diagram 10-17s bms wiring