WIDE COMPATIBILITY: The solar charger controller with 20A rated discharge current is compatible with 12V or 24V system automatically, suitable for lead-acid batteries: OPEN, AGM, GEL. not for nickel hydride, lithium, Liions, or other batteries. RELIABLE PROTECTION: The solar charge regulator provides over-current protection, short-circuit protection, inverse connection protection, low voltage and overcharge protection, a reliable protector for your devices. INTELLIGENT: Build-in industrial microcontroller for automatical management, memorizing various parameters set by the user and the data won't be lost when the battery runs out. The solar controller will turn off automatically once the voltage is too low. FUNCTIONAL LCD DISPLAY: Intuitive LCD display that can clearly indicate the status and data is able to switch modes and parameter configuration, suitable for home, industrial, commercial, etc. EASY TO USE: The charge controller should connect the battery first, then the solar panel, and finally the load! You can change the settings by the simple one-button operation.