SOC stands for "state of charge" and is an indication of battery power, ranging from 100% to 0%. According to the SOC value, the load output is stopped when the SOC is less than 30%. According to the SOC value, select the charging mode (floating charge, boost, equal). The actual charge procedure, or the type of voltage and current regulation during charge, is independent of the SOC. So in SoC mode and voltage control mode, there is always a U-I charge process.