Reason for the sudden drop of the generating capacity of photovoltaic power station
Recently, many users of photovoltaic power plants discovered that the power generation of photovoltaic power plants at home has been reduced a lot, and they found an installer complained that there was a problem with the product. In fact, we don't need to be too nervous. We often say that the 1kW power output is 4-6 degrees/day, which is the average annual power generation. The spring and autumn seasons are peaks for photovoltaic power plants, and winter is the low season for photovoltaic power plants.
In addition to shortening the length of sunshine in the winter and weakening the sunshine, the power generation of photovoltaic power plants in winter has decreased. There are several factors that cannot be ignored:
First, smog and dust
Due to the heating and the dry weather, the dust in winter air is more than in other seasons, and in addition, the winter haze weather is more than that, airborne suspended matter can absorb and reflect sunlight, and the sunlight received by the surface of the module is greatly reduced.
If haze weather persists for a long time, particulate matter on the surface of the photovoltaic module will accumulate, and will form blockage on the surface of the module, resulting in contamination of the surface of the battery module, resulting in further reduction of power generation.
In order to avoid low power generation, you can increase the frequency of scrubbing appropriately according to site conditions in case of serious pollution. According to a U.S. study, the amount of electricity generated per day after scrubbing of photovoltaic modules will increase by 50%, which is a significant effect. However, it does not need to be cleaned frequently. This will only waste water resources.
Maintaining photovoltaic panels clean, in addition to improving power generation, can also effectively maintain photovoltaic components, because the long-term accumulation of particulate matter may cause a large number of components to generate heat, resulting in hot spot phenomenon, but it will threaten the life of the components, but cause fire.
Second, shadow occlusion
Many walls, poles, vegetation and other objects are elongated in the winter, which can easily block the PV modules. This is also the most neglected issue in the construction of photovoltaic power plants in the summer.
The shaded part not only does not generate electricity, but also becomes a source of resistance heat, which reduces the amount of power generated. Moreover, long-term heat generation may cause damage to the battery sheet and may even cause a fire.
If this is the case, consider whether it is possible to remove the obstructing object or to find out if the installer can see if the blocked PV module can be moved.
Snow covers the module. Only a small part of sunlight can pass through the snow and reach the photovoltaic module. This will affect the photovoltaic power generation.
(1) Suggestions for installation of photovoltaic power plants in snow-prone areas:
a. Large-angle installation of photovoltaic panels
Installing the solar panel at a large angle within the optimum inclination angle can reduce snow accumulation speed and eliminate the trouble of clearing snow from time to time.
b. Keep components away from the ground during installation
In this way, snow does not pile up on the bottom when it falls, so that it slowly accumulates and covers the entire assembly.
(2) How to maintain the photovoltaic power station after snow:
a. It is generally recommended not to wait until the snow is too thick before cleaning to prevent the components from freezing.
b. It is not possible to use hot water for pouring photovoltaic panels. Uneven heating and cooling will seriously damage the photovoltaic panels.
c. You can use soft items to push the snow down. Be careful not to scratch the glass as this will reduce the amount of light transmitted. (Using tennis balls to gently bounce on tilted photovoltaic panels will make snowfall a good way~)
d. Components have a certain weight bearing, but they can't be stepped on the components to clean them. This will cause the components to be cracked or damaged, which will affect the life of the components.
e. Snow must be netted. Don't underestimate the strip of snow. The sheltered parts will lead to the failure of the entire photovoltaic panel, resulting in a significant reduction in power generation efficiency.
In addition, the reflection of snow will contribute little to photovoltaic power generation. If the snow does not cover the components, the snow on the ground will be like a mirror to send back the sunlight, so that the power generation will increase.
Finally attach an FAQ:
"The power generated by the photovoltaic power station is not high. Will my house power down?"
Domestic photovoltaic power plants are all connected to the national grid. When the electricity generated by photovoltaic power generation is insufficient to meet the demand for electrical appliances, the power of the national grid will be supplemented by itself. Therefore, there is no need to worry about power shortage.