For those who have installed photovoltaic power plants at home, the following points need to be paid attention to. In winter, cold wind, heavy snow, smog and dust are all factors that affect whether the power plant can continue to survive!
How should we maintain this?
The impact of snow on photovoltaic power plants is similar to the impact of dirt mentioned above, both of which affect the light transmittance of modules, which in turn affects the output performance of cells.
If there is thick snow accumulated on the components after snow, it needs to be cleaned. You can use soft objects to push the snow off, and be careful not to scratch the glass. The components have a certain load-bearing capacity, but they cannot be cleaned by stepping on the components, which will cause cracks or damage to the components and affect the life of the components.
Suggestion: Clean the snow on the components in time, do not wait for the snow to be too thick before cleaning, and check the stability of the bracket at the same time. At the same time, snow and ice on components will also affect the power generation and life of the system.
Precautions for clearing snow
1. Be sure to use soft objects to prevent scratching the glass and reduce the light transmission of battery components;
2. Be careful not to use hot water to pour the surface of the battery panel. The unevenness of cold and heat will seriously damage the surface of the battery panel;
3. Be careful not to step on the components for cleaning. The components have certain load-bearing requirements, which may cause cracks or damage to the components and affect the life of the components.
4. Be careful not to wait for the snow to be too thick before cleaning, so as to prevent the components from freezing.
5. Snow removal must be clean, don't underestimate the snow in strips. If there is only a small strip of snow left on the battery board, it must be cleaned up. The covered battery board will fail as a whole, resulting in a significant decrease in the power generation efficiency of the inverter.
6. It is not advisable to use sharp objects to hit the battery board, so as not to scratch or even break the tempered glass, and excessive force will cause cracks in the photovoltaic module cells, which will affect the power generation of the entire power station.
Snow removal tips: For small power plants, cloth or plastic paper can be used to cover the panels before heavy snowfall, and then uncovered after snowfall.
Haze & Dust
Since photovoltaic modules are placed outdoors all year round, dust, rain, bird droppings and other pollutants become frequent visitors to photovoltaic modules. These dirt accumulate on the surface of the photovoltaic module, which reduces the light transmittance of the glass of the module, which in turn leads to a decrease in the output performance of the cell. When there is more dust on the surface of the photovoltaic module, the light transmittance of the photovoltaic module will be poorer, and the radiation absorbed by the panel will be lower, which will lead to a decrease in photovoltaic power generation capacity. It is reported that the loss of power generation efficiency caused by dirt accumulation can reach more than 15%.
Compared with summer, there will be more smog in winter, and there will be relatively less dust on components in spring and autumn due to rain. Haze mainly affects the power generation of distributed photovoltaic systems in two ways:
Weaken the solar radiation reaching the photovoltaic panel, because the suspended matter in the low air will absorb and reflect the sunlight, resulting in a significant reduction in the sunlight received by the surface of the module.
If the smoggy weather continues for a long time, the particles on the surface of the photovoltaic module will accumulate and form a shield on the surface of the module, causing the surface pollution of the battery module and further reducing the power generation.