... 2.High power efficiency 3.electric yaw system 4.off-grid and on-grid system 5.CE certificate wind energy street light Effsun ... conditions can keep lighting 4days,above 10 hours per day.4,Battery protection:intelligent charge and release power,prolong battery life ... function,over current,under voltage protection.8,Low power:whole system using industrical devices,adopting high temperature,cold,wet and so ...