Daily maintenance of PV module
1.The surface of the PV module should be kept clean, and the PV module should be wiped with dry or soft and clean cloth, and it is strictly forbidden to use a corrosive solvent to wipe the PV module. PV modules should be cleaned with irradiance below 200W/m2, and it is not advisable to use a liquid with a large temperature difference from the modules to clean the modules.
2.PV modules should be regularly inspected.
3.The use of metal frame of PV modules, the frame and bracket should be well combined, the contact resistance between the two is not more than 4Ω, the frame must be firmly grounded.
4.When working under the condition of no shadow occlusion, under the condition that the solar irradiance is more than 500W/m2 and the wind speed is not more than 2m/s, the temperature difference between the outer surface of the same PV module (the area directly above the cell) should be less than 20 °C. An infrared thermal imaging camera is used to detect temperature differences in the outer surface of PV modules.
5.The input current of each PV module string connected to the same DC bus box should be measured using a DC clamp ammeter under conditions of basically the same solar radiation intensity, and the deviation should not exceed 5%.
6.All bolts, welds and bracket connections of the bracket should be firm and reliable, and the anti-corrosion coating on the surface should not crack and fall off, otherwise it should not be brushed in time.