Duff LiFePo4 or duff settings

[RichieM]

Hi,
I've wanted to upgrade to lithium for a while now but finally bit the bullet and bought a Eco-worthy 100Ah with Cold shutoff and Bluetooth BMS. I also purchased a Victron Orion XS to replace a Durite split charge relay that I believe wasn't particularly good with the previous AGM battery I had. That was simple to swap over. I already have a Victron MPPT 100/20 with a 200w panel on roof.

It looks a minefield with the different settings on each system.
On charging the system I get "Single Cell Voltage too high" .
On the individual cells one is 3.53 v compared to an adjacent one of 3.43 v

Am I perhaps pushing the battery too much or is it possibly a bad cell from the factory?

Any suggestions?

 

[Anakin]

The individual cells should be balanced by the BMS, but perhaps one has a fault? Worth contacting the seller of the battery?

LiFePO4 Battery Balancing

LiFePO4 batteries are the best that the technology has on offer right now. Their long lifespan and highest value for money make users replace alternative

ecotreelithium.co.uk

 

[Jamesie]

How did you charge the battery? Do you have a mains hook up charger and if so did you change the settings on that to lithium profile? If it was from alternator charging via the Victron XS DC to DC, did you reduce the the max charge rate on the Victron? I've got a Victron XS 50 and a Fogstar 100Ah battery but reduced the max charge rate to 30A as the recommended charge rate by LifePO battery suppliers is no more than 0.3 x capacity.

 

[RichieM]

I've been charging mainly through solar. All settings changed to Lithium. I also have a Victron IP22 and had already changed the settings there too. Also have a max of 30A on the Victron XS.
I've emailed eco-worthy too so.will see what they say.

 

[ginkster]

Leave it charging on the ip22 for a good few hours to give the BMS a chance to balance the cells. Then discharge to about 20% and recharge a few times to let it all settle and calibrate. If that doesn’t work then possibly something isn’t right.

 

[Dellmassive]

Cell over voltage normally pops up when the charge rate is a bit high for the particular battery....

You can try tweaking the settings a bit.

Start by dropping the bulk charge voltage by 0.2v steps on all your chargers and retest. (So the profile in the ip22 and mppt)

I had similar on my power road batterys.... Dropping the bulk voltages helped slow the charge rate down enough to stop one cell peeking prematurely.

 

[RichieM]

Thanks @Dellmassive that did the trick.
I set Absorption Voltage to 13.8v, float voltage at 13 5v. Re-bulk voltage offset is 0.1v

From the Eco-worthy it's now sitting at 13.60v 99% charged in standby with 106.35Ah available.
Cheers everyone.

 

[Dellmassive]

Sweet....