The maximum power point of the pv array can be quickly tracked in any environment so that it can get the maximum energy from the solar panel and significantly improve the utilization of energy in solar system. The machine has LCD display and standard communication interface, convenient for user extension application and satisfy different monitoring needs to the maximum extent. It can be used in communication base station, home power system, solar street lamp, courtyard lamp systems, etc. Feature: MPPT maximum power point tracking technology, the tracking efficiency is no less than 99.5percent . Fine quality material are used to improve the system performances, and the maximum conversion efficiency can up to 97percent . Quick maximum power tracking speed while ensuring tracking efficiency. Reliable maximum input power of pv array to ensure the safety of equipment. Wide pv array maximum power point operating voltage range. 12Volt/24Volt automatic voltage identification. The LCD is designed to dynamically display the operation data and working status of the equipment. Various load control modes: general mode, light control mode, dual time mode, purecharger mode and timing mode. The function of battery temperature compensation. Power statistics recording function. Specifications: Current: 20A, 30A, 40A (optional) Tracking efficiency: more than 99percent Color: black+orange Material: metal+plastics Item size: 20A: 178 * 123 * 48mm / 7.0 * 4.8 * 1.9in 30A: 202 * 135 * 55mm / 8.0 * 5.3 * 2.2in 40A: 220 * 150 * 67mm / 8.7 * 5.9 * 2.6in Package size: 20A: 205 * 130 * 55mm / 8.1 * 5.1 * 2.2in 30A: 220 * 145 * 60mm / 8.7 * 5.7 * 2.4in 40A: 260 * 205 * 100mm / 10.2 * 8.1 * 3.9in Package weight: 20A: 650g / 1.4lb 30A: 920g / 2.0lb 40A: 1620g / 3.6lb Packing List: 1 * Solar Panel Controller