BATTERY DOCTOR SOLAR REGULATOR -- With LED indicators showing four levels of charging status; Handles up to 30 amps of array current and 500 watts of solar power; Charges, maintains, and regulates 12V batteries from overcharging and discharging; Continuously displays the charging current or battery voltage on the LCD digital meter; Automatically indicates the charged condition of the battery on the LED bar graph; For use with 12V gel-cell and lead acid batteries; Easy to mount.