ITEM NAME:12V-48V 30A Car Battery Low-Voltage Alarm Anti-Over Discharge Protect Controller Descriptio n Description: Charging Mode IN By Setting The Upper Limit Voltage UP And The Lower Limit Voltage Dn; When The Battery Voltage ≠¤ The Lower Limit Voltage Dn, The Relay Is Turned On, The Charger Starts To Charge The Battery; When The Battery Voltage ≠¥ The Upper Limit Voltage UP, The Relay Is Turned Off, And An Automatic Charging Is Completed; The Relay Is Turned On, IN Flashes To Indicate That Charging Is In Progress. Discharge Mode OUT By Setting The Upper Limit Voltage UP And The Lower Limit Voltage Dn; When The Battery Voltage ≠¥ The Upper Limit Voltage UP, The Relay Is Turned On, And The Discharge Starts; When The Battery Voltage ≠¤ The Lower Limit Voltage Dn, The Relay Is Turned Off, And An Automatic Discharge Function Is Completed; The Relay Is Turned On, And The OUT Blinks. Indicates That It Is Discharging. Note: This Product Is A Simple Voltage Controller That Turns The Output On And Off Through The Relay. It Only Acts As A Switch And Cannot Be Transformed. Function Description: 1. Calculation Of Voltage Percentage: Battery Voltage / (Upper Limit Voltage - Lower Limit Voltage) 2. Button Function: UP Button: Short Press To Switch Display % And Time, Long Press For 5 Seconds To Switch Mode, Charging Mode: IN, Discharge Mode: OUT SET Button: Short Press To View The Currently Set Parameters; Long Press The SET Button To Enter The Parameter Setting Interface, Set UP: Voltage Upper Limit, Dn: Voltage Lower Limit, OP: Conduction Time, DOP: Delay On Time (0-999 Seconds) There Is FOP In The Discharge Mode: Forced On Time (0-10 Seconds) Long Press The DOWN Button To Set The Status Of The LCD Backlight LP: OFF Backlight Is Always On, ON: Backlight Is Automatically Turned Off After 5-10 Minutes; Wake Up With Any Button. 3. Parameter Settings A. Press And Hold The SET Button To Enter The Parameter Setting Interface; B. After Entering The Parameter Setting Interface, Switch T.The Maximum Expenditure Level Is 48V. Indicates That It Is Discharging. When You Want To Reduce The Charging Current, Usually The Charging Current Is 1 To 1.5 Of The Battery Capacity, Such As 20AH Battery Charging Current Is Generally Around 2-3A!