Hello, dear.
C10 is the 10-hour discharge rate of the battery, that is, let the battery discharge at a constant current, exactly 10 hours to discharge the battery power (the battery is not damaged, after charging can be used normally)
Battery there is a capacity: 500Ah battery capacity (power), Ah is A * h (ampere * hour), if the discharge current is 1A, then this group of batteries can be put 500 hours. If the discharge current is 10A, then this group of batteries can be put 50 hours. If the discharge current is 50A, then this group of batteries can put 10 hours. From here we can see that 500Ah battery C10 is 50A.
Charge current limit point 0.15C10, which is 0.15*50A=7.5A
If it is two groups of batteries speak the calculated value *2. is the charge limit current of your battery.
Rectifier modules can be matched automatically, you can also manually set in the SMU module to limit the current expectation of the maximum current value of the rectifier module output and the percentage of the rated output current of the rectifier module
For example: the power system is configured with three 50A rectifier modules, the user expects the power system to output 120A, the current factor should be set to 120A/(50Ax3) = 80%.