ECO-WORTHY 20A MPPT Solar Charge Controller Solar Regulator for 500W Solar Kits High-speed MPPT High technology: MPPT with LCD display, efficiency &gt; 99%, Employs a DC converting circuit,conversion efficiency &gt; 96%. More selections for your need: Five output modes: Manual, Standard, Timer, Light sensor, Light sensor on + Timer off. Advanced electronic protection:Over charge, over discharge, overload and short circuit protection. 3-stage charging algorithm, impulse, bulk and float.Built in timer, suitable for a periodic discharge system such as solar street lights, solar pumps etc. Frequently bought together Asin: B00V4844F4 Rated system voltage: 12V/24V DC Max solar panel power: 250W 12V /500W 24V Max output current: 20A Max discharge current: 20A Over discharge voltage: 10.2-12.5V (0.2) 12V / 20.4-25.0V (0.2) 24V Restart voltage: 10.3-13.5V (0.2) 12V / 20.5-27.0V (0.2) 24V Constant voltage (Over charge voltage): 13.0-15.5V (0.2) 12V / 26.0-31.0V 0.2) 24V Float Voltage: 12.5-14.5V (0.2) 12V / 25.0-29.0V (60.2) 24V Converter type: Buck Converter efficiency: &gt; 96% Max increase efficiency: &gt; 43% Tracking efficiency: &gt; 98% Precision of clock: 50S/Month Charging algorithm: PWM 3 stage Size: 5.55.81.6in (14014742mm) Weight: 1.21lbs (550g) Well packed with protective material Package includes: 1PC 20A 12/24V &amp; user manual Battery voltage setup &amp; LCD display Please program the right system voltage according to your battery voltage, the controller can&#039;t work normally before the correct system voltage is set. If you want change the system voltage,disconnect the controller for 20 seconds, then the system voltage can be reset. The 20A MPPT solar controller is Perfect for off grid solar system and control the charging and discharging of the battery, especially suitable for the street light system.