12.8 v 15A LIFEPO4 charger

[Bobbysmith]

I have bee searching for the techniques to charge 15A 12.8v (3.2 x 4 cells) It does not apear that industry makes a single chip solution so I have started to design a custom. I am using a Pic18f2331 and assorted support parts. I have a current sensor, AD converter to monitor cell volts and a 3A CC power supply and a 12.8 volt CV supply all ties if with FETS to control as battery charges. Anyone know how to charge and at what points I should pull CC and switch to CV ? Once I have completed desing I would be happy to post schematic and PIC code for everyone to enjoy.

Bob

 

[ahmedragia21]

was doing the same since days,
check this

https://www.electro-tech-online.com/custompdfs/2013/01/slyt333.pdf

 

[KeepItSimpleStupid]

Pricy, but would work as an almost ready made solution: https://www.mini-box.com/OpenUPS

You really need to cell balance and measure the temperature of the cells and monitor for excess current draw. Looking at the controller documentation would give you lots of help.