1. Intelligent control of battery charging and discharging; 2. You can set the charging and discharging time; 3. With serial communication function, real-time monitoring of the relay working status through the serial port; 4. Additional signal output, when the relay meets the conditions, the output high, you can control other equipment. 5. A key emergency stop function (STOP button), with reverse protection, reverse does not burn. Working mode: Upper limit voltage: UL1, lower limit voltage nL1, the upper limit voltage is higher than the lower limit voltage (UL1 greater than nL1); U-1: Charging measurement: When the measured voltage is lower than the lower limit voltage, the relay pulls in; the upper limit voltage, the relay is disconnected. U-2: Charging measurement time control: Set the charging time (OP); when the measured voltage is lower than the lower limit voltage, the relay pulls in, and then starts the OP time countdown, the timer ends, the relay turns off; when the measured