Poida MPPT setting changes for LiFePo?

Author	Message
oreo Senior Member Joined: 11/12/2020 Location: Canada Posts: 123	Posted: 07:17pm 13 Dec 2024       I am using LiFePo batteries made by A123 and they do specify a float voltage for these at 3.4v per cell.  I see others using in the range of 3.35-3.4v float voltage. On my cheap china MPPT, when I select lithium it does not allow me to set the absorption voltage (just float).  This means that with 3.4v charge/float voltage, when the batteries approach full charge (over 90%?), the battery current starts to drop.   Typically I see other people use 3.45-3.55 absorption voltage (maybe that is the ending voltage with the Poida MPPT, IDK) when supported to give them a quicker time to charge that last 10%.  If you really needed to charge this last portion of the battery fast, you may want to go as high as 3.65v. I would start out safe, and see if you are happy with the results.