1) The surface of the photovoltaic module should be kept clean, and the photovoltaic module should be wiped with a dry or damp soft and clean cloth. It is strictly forbidden to use corrosive solvents or hard objects to wipe the photovoltaic module. Photovoltaic modules should be cleaned when the irradiance is lower than 200W/㎡, and it is not advisable to use liquids with a large temperature difference from the modules to clean the modules.
(2) Photovoltaic modules should be checked regularly. If the following problems are found, the photovoltaic modules should be adjusted or replaced immediately.
- Photovoltaic modules have glass shattering, backplane scorching, and obvious color changes;
- the existence of air bubbles in the photovoltaic module that form a communication channel with the edge of the module or any circuit;
——The photovoltaic module junction box is deformed, twisted, cracked or burned, and the wiring terminals cannot be in good contact.
(3) The live warning sign on the photovoltaic module must not be lost.
(4) For photovoltaic modules using metal frames, the frame and bracket should be well combined, the contact resistance between the two should not exceed 4Ω, and the frame must be firmly grounded.
(5) When working under the condition of no shadow and shading, under the condition that the solar irradiance is above 500W/㎡ and the wind speed is not greater than 2m/s, the temperature difference on the outer surface of the same photovoltaic module (the area directly above the battery) should be less than 20°C . Photovoltaic power stations with an installed capacity greater than 50kWp should be equipped with infrared thermal imaging cameras to detect temperature differences on the outer surfaces of photovoltaic modules.
(6) Use a DC clamp ammeter to measure the input current of each photovoltaic module string connected to the same DC combiner box under the condition that the solar radiation intensity is basically the same, and the deviation should not exceed 5%.
(7) 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 or fall off, otherwise it should not be brushed in time.