The main function of solar panels is to convert light energy into electrical energy, a phenomenon called photovoltaic effect. Among many solar cells, the most common and practical ones are monocrystalline silicon solar cells, polycrystalline silicon solar cells and amorphous silicon solar cells. In the eastern and western regions with sufficient sunlight, it is better to use polycrystalline silicon solar cells, because the production process of polycrystalline silicon solar cells is relatively simple, the price is lower than that of monocrystalline silicon cells, and the conversion efficiency has been continuously improved in recent years. In the southern region where there are more rainy days and relatively less sunshine, it is better to use monocrystalline silicon solar cells, because the electrical performance parameters of monocrystalline silicon solar cells are relatively stable. Amorphous silicon solar cells are better in the case of weak indoor sunlight, because amorphous silicon solar cells have lower requirements for solar lighting conditions.
Solar cells have five electrical performance parameters:
1. Isc is the short-circuit current
2. Im is the peak current
3. Voc is the open circuit voltage
4. Vm is the peak voltage
5. Pm is the peak power
Note: Pm is peak power = Im is peak current × Vm is peak voltage.
For monolithic solar cells, it is a PN junction, which has all the characteristics of a PN junction except that it can generate electricity when sunlight shines on it. Under standard lighting conditions, it has a rated output voltage of 0.48V. The solar cell modules used in solar lighting fixtures are composed of multiple solar cells connected.
Post time: Sep-16-2022