The characteristics of the solar photovoltaic lighting device are that it does not need a power grid, does not need to lay wires, is flexible, portable, safe, energy-saving and environmentally friendly. But at the same time, it is also restricted by many conditions. The large one-time investment makes the cost higher than traditional road lighting. The cost of solar cell power generation is higher than the cost of thermal power generation. This shows that it cannot be used without government financial subsidies. Save money (and expensive battery replacement costs); in addition, solar cell power generation needs to be able to receive the radiant energy of the sun, and the shade of urban roads and high-rise buildings bring inconvenience to solar photovoltaic lighting installations.
The characteristics of solar photovoltaic lighting devices determine its current scope of application. Special occasions: places without electricity; places where electricity is not available although the power grid is nearby (this is often encountered); occasions that require frequent movement; need Use solar photovoltaic lighting devices to promote new energy and promote environmentally friendly occasions. Looking back at history, all applications that conform to the above-mentioned rules are basically successful; all applications that do not conform to the above-mentioned rules basically fail. At most, it is a county flower, and after a lot of excitement, it ends in a hurry.
The last thing to note is that the above conclusions are based on the current conversion efficiency of solar cells and national policies. If the conversion efficiency of solar cells is improved in the future, the price of solar cells will drop significantly, or the government financial subsidy policy can be introduced. , The above conclusion is not necessarily correct; in addition, the grid-connected solar photovoltaic power generation lighting system is not in the scope of discussion.
In addition, because the efficiency of current commercial solar cells is still relatively low, the conversion efficiency of monocrystalline silicon solar cells is about 16%, the conversion efficiency of polycrystalline silicon solar cells is about 15%, and the conversion efficiency of amorphous silicon solar cells is close to 8%. The energy available per unit area is still relatively small, only 15~16mW per square centimeter; in addition, the price of solar cells is relatively expensive. The above characteristics determine the current proportion of small solar photovoltaic lighting devices in the field of solar photovoltaic lighting. It is relatively large, and only from the consumption of solar cells, it accounts for more than half. Small solar photovoltaic lighting appliances are currently mainly used in places where there is no power supply or where it is difficult to lay wires.
Among solar photovoltaic lighting appliances, solar emergency lighting devices were the first to be developed. In devastating natural disasters such as floods and earthquakes, solar emergency lighting devices are the best solution to night lighting in disaster areas. This includes solar emergency lights and solar flashlights.
In addition, the application of solar photovoltaic lighting appliances can also be divided into functional solar photovoltaic lighting appliances and decorative solar photovoltaic lighting appliances. Among the functional small solar photovoltaic lighting appliances, there are solar house lights, solar letter box lights, solar bicycle lights, and solar sensors. Lights, solar remote control lights, solar reflective bird repellers, etc. Although these solar products are mainly made in China from a global perspective, they are currently mainly used for export.
In addition to functional solar photovoltaic lighting appliances, there are also decorative small solar photovoltaic lighting appliances. Decorative small solar photovoltaic lighting appliances are mainly divided into solar craft lights, solar buried lights, solar glass decorative lights, solar ground lights, solar Christmas lights, solar candles, solar toy lights and solar color-changing lights. Their characteristic is that the main task of these small solar photovoltaic lighting appliances is not to illuminate the illuminated object, but to emit light by themselves and decorate the environment for the observer to appreciate.
Other decorative solar photovoltaic lighting appliances and solar craft lamps have similar functions. They use the energy of the sun in a very clever way to beautify the environment, and at the same time promote people’s awareness of green environmental protection.