1. Low conversion efficiency
The most basic unit of photovoltaic power generation is the solar cell module. The conversion efficiency of photovoltaic power generation refers to the rate at which light energy is converted into electrical energy. At present, the conversion efficiency of crystalline silicon photovoltaic cells is 13 percent to 17 percent , while that of amorphous silicon photovoltaic cells is only 5 percent to 8 percent . Since the photoelectric conversion efficiency is too low, the power density of photovoltaic power generation is low, and it is difficult to form a high-power power generation system. Therefore, the low conversion efficiency of solar cells is a bottleneck hindering the large-scale promotion of photovoltaic power generation.
2. Intermittent work
On the surface of the earth, photovoltaic power generation systems can only generate electricity during the day and cannot generate electricity at night. Unless there is no distinction between day and night in space, solar cells can generate electricity continuously, which is inconsistent with people's electricity needs.
3. It is greatly affected by climatic and environmental factors
The energy of solar photovoltaic power generation comes directly from the sunlight, and the sunlight on the earth's surface is greatly affected by the climate. Long-term changes in rainy and snowy days, cloudy days, foggy days and even cloud layers will seriously affect the power generation status of the system.
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