Charging rate when full?

[bobdelso]

I have 8, 290ah Eve lifep04 cells in a 24v pack with a jbd bms. I use a mpp solar 24lv unit with 1200 watts of solar.

I changed my charge controller settings to 27.4 float and cv as it was limiting my solar input. I went from 400 watts to 900 watts when charging.

however, my batteries are still taking full charge at roughly 98% capacity, 15 amp rate. Cell voltage is 3.35. At 100% capacity, 288 ah/290 and 3.37 voltage per cell it was still taking 5 amps charge.

it's it normal for the batteries to charge at 100-500 watts until 3.4 volts per cell? Just seems a bit much

 

[MisterSandals]

Cell voltage is 3.35.

Is that the resting voltage? If you're charging with ~14V, your measurement is not just the cell voltage,

 

[740GLE]

Until cells get above 3.5v while being charge it should take everything you toss at it.

You said the SOC was 98%, how are you determining that SOC, via BMS or a smart shunt?

 

[ArthurEld]

Mine keeps charging like that because if it stops charging voltage drops.
Like MisterSandals is asking about, you probably don't know the resting voltage.
I like it stay around 3.4V per cell for a couple hours everyday so my balancer can have some time to work

 

[bobdelso]

Until cells get above 3.5v while being charge it should take everything you toss at it.

You said the SOC was 98%, how are you determining that SOC, via BMS or a smart shunt?

Until cells get above 3.5v while being charge it should take everything you toss at it.

You said the SOC was 98%, how are you determining that SOC, via BMS or a smart shunt?

Bms smart shunt tracking ah and state of charge via voltage. Appears that my voltage levels are a bit off the real % charge and my cells are probably closer to 300ah capacity instead of 290.

Seems like it's working as normal, thanks