SOLAR CHARGE CONTROLLER: 12V/24V automatic identification charger, lead-acid battery (lithium battery, Ni-MH battery is not available) solar charge controller, only supports photovoltaic solar panels as a charging source. VOLTAGE MATCHING: When the charging battery is 12V, choose the 17-22V solar panel; when the charging battery is 24V, choose the 30-42V solar panel for charging. Charging with mismatched voltage will damage the controller. LCD SCREEN + CONTROL FUNCTION: charge and discharge status display, cumulative power generation and discharge query, temperature display. Light control + delay control, adjustable charge and discharge parameters, with power-off memory function. PROTECTION FUNCTION: built-in over current, short circuit, open circuit, reverse connection, protection; self-recovery protection, does not damage the controller, and extends the service life. NOTE: The power of solar panels should match the battery capacity as much as possible, otherwise it will easily lead to abnormal charging; the best charging current for the battery is 10%-20% of the battery capacity.