To determine the quality of a photovoltaic power station, the most direct expression is in the power generation, it can be said that the power generation is the standard to measure a photovoltaic power station. However, in practice, the amount of electricity generated by the same scale power station may vary greatly. How do these differences come about? Today we will explore the main factors that contribute to the generation of photovoltaic power station.
Photovoltaic power station has three power generation systems: on grid, off grid and hybrid grid. In a large-scale photovoltaic power station project, it is generally on grid or hybrid grid system, while off grid system is usually use in household. The biggest difference between on grid and off grid systems is whether there are energy storage batteries. On grid systems are connected to the public grid and must rely on the existing grid to operate. Off grid systems can operate independently of the grid, and direct electricity from solar panels into batteries and store it. Hybrid system is a combination of off grid and on grid.
Back to the topic of affecting electricity generation. Photovoltaic power generation is through the solar energy into electricity for people to use. Therefore, solar energy is the source of electricity generation, and how to use solar energy efficiently will directly affect the final convertible electricity.
We all know that due to the influence of the earth’s rotation and revolution, the sunlight that can be absorbed is different in different latitude and longitude regions on the earth. There are also differences in light hours of different climates. Therefore, in order to convert the solar energy into electricity as much as possible, we will adjust the installation angle of photovoltaic panels according to different latitude and longitude when installing the photovoltaic system, so as to achieve the best efficiency.
In addition to the angle of photovoltaic panels, the natural factors such as installation site, wind load, snow load will also affect the capacity of photovoltaic power station, this is something we can’t change, but we can comply with the nature, by selecting high quality photovoltaic panels, select the appropriate photovoltaic brackets to meet the conditions of installation area, to minimize the impact of such limiting factors. SOEASY has designed and installed more than 1000 projects, in more than 100 countries around the world, has a very rich design experience. If you have relevant questions, you can leave a message for consultation.
The core factor affecting the power generation is solar modules. The output wattage of monolithic module also varies greatly. Photovoltaic industry has developed to today, solar modules has from 100W to 600W power range. At present, the mainstream solar modules used in photovoltaic power station projects are mainly 450-500W, compared with low-wattage modules, can achieve bigger power generation in the same area SOEASY Half Cell Mono PERC solar modules, monolithic module can output 480-550 W, is an industry leading of module efficiency， that up to 21.1%, is a excellent choice for pv projects.
Next, the cleaning of the module surface. Photovoltaic projects accept the gift from the sun, also must withstand the invasion of wind, frost, snow and rain. The surface of the pv panel is attached with a layer of glass, which over time will deposit dust on the surface of the photovoltaic panel. Dust will block the light of photovoltaic modules, thus affecting the power generation, the heat dissipation capacity, and the conversion efficiency. The influence of this on the annual power generation is generally 5% to 10%. If the photovoltaic modules are not cleaned basically all year round, the loss of power generation will even be as high as 10-20%.
In rainy and snowy areas, the module surface may also be covered with snow. Or after the rain, dust on the surface of the modules will become mud, to the edge of the solar module, blocked by framework cannot eliminate, after long-term accumulation, these deposits may produce rainbow stripes on the surface of the component (glass surface coating damage), the transmittance of module glass is seriously affected, some can cause modules to produce hot spot, damage to the module will seriously affect the power generation rate of the photovoltaic module.In this case, solar drainage clips can be used to avoid the accumulation of sewage from the source.
In addition to the above factors, there are also some peripheral accessories and facilities of photovoltaic power plants that also affect the power generation of the entire photovoltaic system. For example the inverter，which is also crucial to the power generation of the power station. In addition to transforming direct current into alternating current, it also undertakes tasks such as detecting components and power grid conditions, system insulation, and external communication. So when select inverter, quality is the primary consideration; when install inverter, need avoid direct sunlight, installed in the ventilation and heat dissipation place; When selecting the installation site of inverter, it is necessary to ensure that there is no interference of any other power and electronic equipment around the installation site.
The quality of cables, grounding clips, grounding lug and other solar accessories is also important factors to ensure the power generation of photovoltaic power stations. It is worth noting that in photovoltaic power station projects, especially those with special environment, choosing photovoltaic cable instead of conventional cable can effectively ensure long-term and stable operation of the power station. This is the most overlooked detail in practice.
Finally, the energy storage batteries，which is hybrid and off grid specific. Energy storage batteries can effectively improve energy utilization efficiency. When choosing energy storage batteries, it is necessary to choose high safety, long life and high energy conversion efficiency, so as to better store the electricity generated by photovoltaic power stations for emergencies.
To sum up, there are many factors that affect the power generation of a photovoltaic power station. From material selection, station construction, to operation and maintenance, every link is crucial. The handling of every detail may affect the return on investment in the later stage of the entire power station. Over the years, SOEASY has been focusing on various details in the photovoltaic power station, and has provided many professional designs for our customers. We have also developed many products to assist in the operation and maintenance of the power station in the later stage, such as cleaning machines, solar drainage clips, etc., to help people improve the efficiency and stability of photovoltaic power generation in multiple dimensions. We hoping that through the cooperation of SOEASY and all environmentalists, we can provide the world with more renewable and clean energy!