This is a warning to those kind folk out there that want to buy battery systems.  I received a 100A JK bms connected to 16 100A cells for a very good price  This comes from a reputable company in Pretoria.  I have dealt with them regarding lead acid batteries and have not had any issues with them.  But my goodness the lithium side of the business definitely needs some work. The bms was setup as follows.

Cell OVP 2.7V

SOC 100% 2.68

CELL OVPR 2.65

CELL UVPR 1.85

SOC 0% V 1.82

CELL UVP 1.8

I believe that if I leave the bms at these settings I will get to use about 20% of the battery and run it bellow the manufactures limits.  This is just a warning to those out there wanting to go semi DIY Iike I am.  After chatting with one of the members at the business  I was given the "correct" settings and the password of 12345 (without the 6). That password obviously did not work lol. I was also informed that going outside the new specs that where given will invalidate my warranty.  Needless to say I will be invalidating my warranty big time.

Do not ask I will not mention the company.

I will be using the settings as set out by Off grid garage on youtube

Rant over

33 minutes ago, Chris G said:

Rant over

You may find, someone selected LTO cells on the BMS and hence the settings...

5 hours ago, Kalahari Meerkat said:

You may find, someone selected LTO cells on the BMS and hence the settings...

This I can agree with. 

As the tech of these BMSes could be 8-24 cells and also LTO and both current lithiums techs it could be that the BMS was set up correctly and someone logged in and reselected LTO and thus the wrong settings were chosen by default as you mentioned. 

These versatile units I do belief the user should at least look at the manual for the JK. There are so many settings as you yourself know. 

I personally think errors on a BMS will be far less forgiving than on an inverter as with the inverter the correctly set up BMS does offer protection. 

Just my 2c.

@Chris G The manual for the BMS does contain the setting ranges normally used by the 3 types of lithium batteries. It's handy to keep it around or even the electronic copy. 

Edited May 6, 20242 yr by Scorp007

There's a problem with older FW on these bms's. When left off for too long the settings revert to LTO

On 2024/05/06 at 2:21 PM, Kalahari Meerkat said:

You may find, someone selected LTO cells on the BMS and hence the settings...

I am tending to agree with you on this.

On 2024/05/06 at 7:52 PM, Scorp007 said:

This I can agree with. 

As the tech of these BMSes could be 8-24 cells and also LTO and both current lithiums techs it could be that the BMS was set up correctly and someone logged in and reselected LTO and thus the wrong settings were chosen by default as you mentioned. 

These versatile units I do belief the user should at least look at the manual for the JK. There are so many settings as you yourself know. 

I personally think errors on a BMS will be far less forgiving than on an inverter as with the inverter the correctly set up BMS does offer protection. 

Just my 2c.

@Chris G The manual for the BMS does contain the setting ranges normally used by the 3 types of lithium batteries. It's handy to keep it around or even the electronic copy. 

I am using the settings as suggested by offgridgarage. Thanks for the advice

On 2024/05/09 at 7:41 AM, Chris_S said:

There's a problem with older FW on these bms's. When left off for too long the settings revert to LTO

I bought a newer style  bms from Lithium cells in Pretoria as I wanted the bms connection and display they come with.  I believe this problem has been sorted out now