The start voltage and stop voltage of this control module can be set according to your need This is a battery charging switch module that can control charging of 12V 24V storage batteries If you set 10V as start voltage and 14V as stop ,then module will battery when voltage is lower than 10V ,and stop charging when voltage is higher than 14V Support battery voltage detection ,automatically stop charging when battery is fully charged Press run and stop button together ,the module will display 888 and restore to factory setting