Required Torque for Seplos BMS

_laurens · Feb 4, 2023

I'm currently builder a mason 280 system; however the manual is a bit confusing regarding the torque (or well, the whole manual).

It says:

Fix the battery terminal with torque index of 1.5-2 Newton meters, BMS with the torque index of 1.5-2 Newton meters, display screen of torque index of 0.5-1 Newton meters, fuse of recommended 7 Newton meters, and copper busbar of torque index of 7 Newton meters.

with this image:

With this I think it would be:
The long bar with 3 horizontal screws: 1.5 - 2nm
fuse connector: 7nm
shunt connector: 7nm(?) looks too small for that...
the connectors for the terminal (m8 screws): 7nm
bms mount screw: 1.5 - 2nm

What did you use for this part?

sunshine_eggo · Feb 4, 2023

M8 is the thread, not the hex size. It's hard to tell, but those don't look like M8.

If it's an 8mm hex, it's likely M5.

_laurens · Feb 5, 2023

sunshine_eggo said:
M8 is the thread, not the hex size. It's hard to tell, but those don't look like M8.

If it's an 8mm hex, it's likely M5.

It's a 13mm hex, and the thread is thicker than a 6mm; so it's either 8 or 10 likely.

Torqued those with 7nm because those are big and I assumed it can take more, I'm specially interested in the shunt en vertical bar with 3 screws (I have it now torqued at 2nm)

houseofancients · Feb 5, 2023

in this build instruction video, the guy gives all torque specs :

_laurens · Feb 5, 2023

oeh, missed that part thanks

but i'm wondering, he says to use 7nm for those smaller screws (bms); however he has a hex but I have a philips screw... pretty sure it'll break before 7nm

houseofancients · Feb 5, 2023

_laurens said:
oeh, missed that part thanks

but i'm wondering, he says to use 7nm for those smaller screws (bms); however he has a hex but I have a philips screw... pretty sure it'll break before 7nm

didnt break on my install with 7nm...

_laurens · Feb 5, 2023

houseofancients said:
didnt break on my install with 7nm...

Haha welp, this is going to be fun ~

houseofancients · Feb 5, 2023

_laurens said:
Haha welp, this is going to be fun ~

fun is what one should live for

_laurens · Feb 5, 2023

Haha three of those are dulled, as expected. Though it might work but you got exactly the correct thickness bit for it; likely haha.

I will try to find some hex screws for this

Might ping up the rep for it, I don't see any reason why they would go philips with this one... haha.

Edit: all are dulled and three of them is stuck, haha

_laurens · Feb 5, 2023

Does anyone know what kind of metal is used for those screws? I need to get replacement because I was to hard to it

Jalle19 · Mar 13, 2024

I recently installed an EEL battery that comes with a Seplos BMS (10E), it also came with Philips screws for the P- and B- terminals, as well as the mosfet terminals. I tightened them as hard as I could with a screwdriver, I hope that's enough.

Should I consider replacing those with e.g. hex screws so I can properly torque them?

Jalle19 · Mar 18, 2024

Couldn't sleep at night so I opened the front panel today and first tightened all the BMS and shunt screws with an electric screwdriver, then used a torque wrench set at 7nm with a Philips bit to further tighten them somewhat. Didn't go all the way cause it felt like the screws can't handle it.

Required Torque for Seplos BMS

_laurens

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