advantages

(1)General: too sunny land, and there are no geographical restrictions, land or sea, whether

mountain or an island, and are everywhere, and there is a direct development and use, and no mining and transport. Environmentally sound

(2)development of solar energy will not pollute the environment, it is one of the most clean

energy, in the increasingly serious environmental pollution today, this is extremely valuable.

(3) Great: each year on the surface of the earth to the solar radiation is equivalent to about 130,000,000,000,000 tonnes of coal, and its total volume in the world is to be developed in the maximum energy.

(4) long-term: According to the current Sun energy rate estimates, the hydrogen storage is sufficient to maintain the 10 billion years of life, in which the Earth is about 1 billion years for several, in this sense, it can be said that the power of the Sun is an inexhaustible.

Disadvantages

1)(1) dispersion of reaches the earth's surface: the total amount of solar radiation even though

it is very large, but energy flow density is very low. On average, the regression line, near the summer weather is sunny, the noon solar irradiance is the largest solar energy in the vertical direction to 1 square meters of solar energy received on an average about 1000 W throughout the day and night; on average, only about 200 W . And in the winter are generally only a half-cloudy days, and generally only about 1/5, so that the energy flow density is very low.

Therefore, the use of solar energy, when you want to be a switching power, often need to be fairly large in size of a collection and conversion equipment, and construction costs high.

2)is not stability: Day and night as a result, the season, Geographic Latitude, and altitude

above sea level, and other natural conditions of the restrictions, as well as sunny, cloudy, cloud, rain, and random factors, therefore, to reach a certain ground of solar irradiance is intermittent, and is very stable, which to a large scale solar energy applications increase the difficulty. In order to make solar energy as a continuous and stable energy, which will ultimately become the conventional energy sources to be able to compete with alternative energy sources, it must be a good solution to the problem, and that is fine in the daytime solar radiation can be stored as much as possible, and divinatory powers for use at night or, but the current accumulator is also solar energy is one of the weak

3). low efficiency and high cost of solar energy: the current level of development, some of the

theoretically possible, the technology is mature. But there is a utilization of solar energy devices, because efficiency is low, the cost is high, in general, the economy, but also not compete with conventional energy sources. In the future is quite a period of time, that solar energy to the further development of major economic constraints.