LFP Full Acceptable Voltage Range is 2.500-3.650.
Working Voltage Range is 3.000-3.400 with Nominal Voltage being 3.200Vpc. 48.0V-54.4V for a "48V" pack.
Grade A+ working range is typically 2.850-3.500 +/- a bit.
BTW: You can charge LFP to 3.650V per cell and fully saturate the cells to where they are taking less than 1A charge. Stop charging and within One Hour, the cells will have settled to around 3.500 +/- a bit. Within Two Hours they'll drop a bit more. This is Absolutely NORMAL for LFP.
2.500-3.000 and 3.400-3.650 are the "Charge Cliffs" and only represent about 5% of total GROSS Capacity of an LFP cell.
What is Gross ?
When A+ Cells are tested, a typical 280AH cell will test out at 285-290AH from 2.500-3.650 but still have 282AH capacity from that cell from the "Working Voltage Range" The "Gross" is the Whole Capacity from the Full Voltage Range, not the Net Working Voltage Range.
Some Gotchas:
Cells will deviate during discharge at a greater rate once the cells fall below 3.000Vpc. Weaker Cells will run to lower voltages that can result in LVD Low Volt Disconnects by the BMS.
Cells will also deviate more above 3.375V-3.400 at that is the top of the working range.
-!- Matched Cells will generally remain close together within the Working Voltage Range and a bit beyond.
The Higher the Amperage Draw, the quicker deviations will occur during Discharge.
The Higher the Charge Rate (not to exceed 0.5C) again will also cause the cells to deviate quicker & farther above the 3.375-3.400 range.
-!- Again Matched cells will deviate less until a higher voltage is reached.
Bulk Commodity cells can be expected to deviate by as much as 1mv per AH capacity of the cells.
Voltage & IR Matched is NOT properly Matched & Batched cells (which have to run through charge & discharge cycles while being Voltage & IR sampled.
You may want to download THIS resource: The PDF File is High Rez chart.
General LiFePO4 (LFP) Voltage to SOC charts/tables 12/24/48V
Also this will help you with additional details and information with regards to assembling & setting up your packs. (Applicable to all LFP)
Luyuan Tech Basic Lifepo4 Assembly Guide
Hope it Helps, Good Luck