Every lithium iron phosphate battery has a nominal voltage of 3.2V, with a charging voltage of 3.65V. The discharge cut-down voltage of LiFePO4 cells is 2.0V. Here is a 3.2V battery voltage chart. Thanks to its enhanced safety features, the 12V is the ideal voltage for home solar systems.
[pdf] A LiFePO4 solar generator is an off-grid energy storage system that harnesses solar energy to provide electricity for various applications. It mainly consists of solar panels, a charge controller, an inverter, and a LiFePO4 (lithium iron phosphate) rechargeable battery.
[pdf] In a battery with a balancing circuit, the circuit simply balances the voltages of the individual cells in the battery with hardware when the battery approaches 100% SOC – the industry standard for lithium iron phosphate is to balance above a cell voltage of 3.6-volts.
[pdf] 
