Newbie Question about charging Lifpo4

[ojames600]

Good day. I have a Growatt SPF 3000Tl LVM-ES and I am using it to charge 16 230ah ( Lifepo4 Cells. Today my battery voltage was 51v and my solar panel produce 11kw , my growatt UI showed that 11kw went into the battery, my question is why is my battery just shows 54v, Is this normal ?, I would think with 11kw going in the battery would be full. I am still learning so any help is appreciated.

 

[rmaddy]

54.0V sounds like a reasonable float voltage for a 48V LiFePO₄ battery. The absorption voltage might be in 56V-58V range depending on how aggressive you want to be but settling down to a float of 54.0V is good.

What are your absorption and float voltage settings?

 

[ojames600]

54.0V sounds like a reasonable float voltage for a 48V LiFePO₄ battery. The absorption voltage might be in 56V-58V range depending on how aggressive you want to be but settling down to a float of 54.0V is good.

What are your absorption and float voltage settings?

Thank you for replying. This is my growatt settings.

 

[Bossrox]

I'm on my 1st set of lith's & I'm using the user mode on my charger to float @ 55.2v which floats each cell at about 3.45v. From what I've gathered from all the lithium users up here, that's a good level. It appears, cells must have some type of memory that's encoded in them so you top off your 1st run to 3.65v to break them in then 3.45v or there abouts depending on the degree of current you want to cycle from them. The understanding I have is for extended longevity, you want to keep the upper & lower limit at least within 10% of the top & bottom voltage limits.