Features:1[Working Principle] Solar micro inverter is a device that converts solar panel DC into AC with small size and capacity commonly used in small solar system. 2[Usage Requirements] To make the grid tie micro inverter work properly it must be connected to the grid normally and when the grid stops working it will also stop generating electricity. 3[Positive And Negative Ends] The positive and negative ends of the solar panel should not be connected backwards. If you extend the solar panel cable you should be careful about this issue. 4[Installation Environment] This microinverter supports IP55 protection rating but it should be installed to avoid direct sunlight and rain and placed in ventilated dry and cool conditions. 5[Voltage Requirement] To ensure normal operation the voltage of the PV panel should not exceed the maximum input voltage of the solar grid tie inverter (Voc0.99EfficiencyMaximum Conversion Efficiency: 92.5%CEC Weighted Efficiency: 120VAC: 90.5% 230VAC: 91.5%Tracking Efficiency: 99.9%Nighttime Loss: