First things first, download the LFP Voltage chart from the link in my signature (the downloadable PDF is higher rez).
I've looked at several places for a simple, easy to read at a glance "chart document" for LFP. I could not find anything comprehensive. I discovered an XLS Worksheet in my stored file and took parts of that to create this chart, I did not...
diysolarforum.com
LFP (LiFePO4) nominal Voltage is 3.200, Working Voltage Range / Curve is 2.900-3.450 or more generally 3.000-3.400.
Voltage Maximums are 2.500 = 0% totally empty, and 3.650 is maximum full.
Below 2.900 and Above 3.500 are the cliff edges that represent approximately 5-7% of total capacity and which is normally reserved off for longevity & maximum cycle life.
ALL LFP can be charged all the way to 3.650V and saturated till they take less than 1A charge, stop charging and they will immediately begin to settle and within an hour they will be at 3.550 and in 2 hours settled around 3.500-3.525. This is Perfectly Normal for LFP.
NOTE: We talk about cell Voltage often will be noted as Vpc (Volts per cell). 12V=4S (4 cells), 24V=8S(8 cells), 48V=16S(16 cells). and Battery packs as a whole as multiples.
Self-Discharge info from EVE - Typical of LFP.
Monthly Self-discharge Rate ≤3%/M (25±2)℃, Storage SOC 30%~50%SOC
FYI on TEMPS: LFP likes the same temps as people do, cannot be charged below 32F/0C (pending on chemistry variant)
Charging Working Temperature 0℃~60℃
Working Temperature -30℃~60℃
Storage Temperature Short Term (Within a Month) -20℃~45℃
IMPORTANT SPECIAL NOTE !
LFP has a very flat voltage curve, this requires Millivolt Accuracy across the entire system or things will not work well !
Your system, the equipment like Solar Charge Controller, Inverter/Charger etc
ALL have to be Calibrated for accuracy. Failure to do so may result in early or late cutoffs, overrunning the BMS or other equipment, and subsequently risking damage or worse outright failure. (That can be Very Bad ! and not just $ poofed away either).
Please review this link from my Signature:
Good Day everyone, This is a topic that seems to be generally neglected by not being mentioned or even considered in many posts. This is unfortunate because components such as Solar Charger Controllers, Inverter/Chargers need to "know" the precise voltages being dealt with. With Lead Acid /...
diysolarforum.com
Some handy Reference Links to answer most questions.
Learn about battery technology, battery maintenance and battery life at Battery University
batteryuniversity.com
Understand the difference between high frequency and low frequency inverters with this quick article.
www.magnum-dimensions.com