Dear all, 

 

I am currently charging my Lithium (LifPO4) as follow:

• Bulk\Absorb: 3.59V /cell
• Float : 3.53 V/cell

 

Based on some feedback received I am considering to change these to (but I am not sure)

•  Bulk\Absorb: 3.51V /cell
•  Float : 3.48 V/cell

 

What is generally the best practice (charge voltage) for charging Litium batteries when there is no communication between the inverter (with buid-in charger) and the battery.?

 

 

Edited May 22, 20233 yr by Screech

Single Cell:

Bulk absorb 3.6v

Float 3.35v

Equates to a float of 90%

 

48V (15s):

Bulk absorb 54V

Float 50.25V

 

48v (16s):

Bulk 57.6v

Float 53.6v

 

* These will be roughly just above 90% SOC.

Edited May 23, 20233 yr by Eurard

Here are the specifications for LEOCH LFePo4 15 cells batteries:

Float charge voltage: 51.75V

Bulk charge voltage: 54V. ( I set it to 52.5V)

 

On 2023/05/22 at 12:11 PM, Beat said:

Here are the specifications for LEOCH LFePo4 15 cells batteries:

Float charge voltage: 51.75V

Bulk charge voltage: 54V. ( I set it to 52.5V)

 

Hi,

3.45V is very high and in some mentions even 100% resting.

 

Drop it a tad, you wont even notice the difference and it is a little better for your battery. If you want to have it chock and block full, take it to 3.4, or 51.00V on the 15 cell batt.

 

 

Edited May 23, 20233 yr by Eurard

Always best to RTFM. If the manual suggest something, then stick with that.  If you are DIY, then check the BMS operation - some only balance above a certain voltage, and you don't want to float below that.