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. 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. Charging 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. Built-in over the current, short circuit, open circuit, reverse connection, protection; self-recovery protection, does not damage the controller and extends the service life.