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release time:2024-05-07 Hits: Popular:AG11 battery
What are the characteristics of photovoltaic cells and what factors affect battery output?
1. Various characteristics of photovoltaic cells
1. Photovoltaic cells use solar cells to directly convert sunlight energy into electrical energy based on the principle of photovoltaic effect.
2. Whether used independently or connected to the grid for power generation, the photovoltaic power generation system mainly consists of three parts: solar panels (components), controllers and inverters. They are mainly composed of electronic components and do not involve mechanical parts. Therefore, photovoltaic The battery is extremely refined, reliable, stable, long-life, and easy to install and maintain.
3. Theoretically, photovoltaic power generation technology can be used in any situation that requires power, ranging from spacecrafts to household power supplies, from megawatt power stations to toys as small as toys. Photovoltaic power sources are everywhere. The most basic component of solar photovoltaic power generation is solar cells (chips), including monocrystalline silicon, polycrystalline silicon, amorphous silicon and thin film cells.
4. Currently, monocrystalline and polycrystalline batteries are used the most, and amorphous batteries are used in some small systems and calculator auxiliary power supplies. The efficiency of domestic crystalline silicon cells is about 10 to 13%, and the efficiency of similar foreign products is about 12 to 14%. A solar panel consisting of one or more solar cells is called a photovoltaic module.
2. Factors affecting the output characteristics of photovoltaic cells
1. Effect of temperature on the output characteristics of photovoltaic cells and components
As we all know, when the temperature of photovoltaic cells and components is high, the working efficiency decreases. As the temperature of the photovoltaic cell increases, the open circuit voltage decreases. In the range of 20-100 degrees Celsius, the voltage of the photovoltaic cell decreases by about 2mV for every 1 degree Celsius increase. The photocurrent increases slightly with the increase of temperature, about every 1 degree Celsius. The photocurrent of the battery increases by one thousandth when the temperature rises by 1 degree Celsius. In general, for every 1 degree Celsius increase in temperature, power is reduced by 0.35%. This is the basic concept of temperature coefficient. Different photovoltaic cells have different temperature coefficients, so the temperature coefficient is one of the criteria for judging the performance of photovoltaic cells.
2. Effect of light intensity on the output characteristics of photovoltaic cell modules
Light intensity is proportional to the photocurrent of photovoltaic cells and components. Within the range of light intensity from 100 to 1000 watts per square meter, the photocurrent always increases linearly with the increase of light intensity; while light intensity has little effect on voltage, and changes in temperature Under fixed conditions, when the light intensity changes within the range of 400-1000 watts per square meter, the open circuit voltage of photovoltaic cells and modules remains basically unchanged. Therefore, the power of photovoltaic cells is basically proportional to the light intensity.
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