Over voltage protection function: When the battery voltage is higher than the set value, the device will automatically cut off the inverter output when the front panel LED flash 3 times per second and the buzer alarm frequently sound.

Under voltage protection: When battery voltage drops below the set value, the device will automatically cut off the inverter output and the LED on the front panel flash 1times per second, buzzer sound 1 times per second until voltage rise to the voltage recovery point, then the inverer back to work.

Overload,short circuit protection: if the load exceeds the rated power or a short ciurcuit , the front panel LED will blink 2 times per second and the buzzer frequency of 2 times per second alarm sound. This stae can not restore itself, please turn off the power switch and check to make sure whether the short circuit and loasd whthin the allowed range.