If you purchased the batteries with a communications port you can download the software from
https://sakopower.com/download
With this software you can monitor the batteries.
To get the battery BMS to balance cells you will need to charge with 56 volts (16 cells x 3.5 volts per cell). Most BMS will start to balance cells at 3.45 volts (depends on settings in the BMS which the software will allow you to view) and once balancing starts the BMS will reset SOC to 100%
You can use up to 58.4VDC but you would be better to use 56.5 for bulk until you have the software to more closely monitor your system
The instruction for 51.2V 100AH LiFePo4 battery as sample:
1.1 Discharge current do not more than 100A
1.2 Charge current do not more than 50A
1.3 Bulk charging voltage: 58.4VDC
1.4 Low DC cut-off voltage: 48VDC
1.5 Low DC alarm voltage:44.8V