There is a problem

In our country due to the thin-film photovoltaic solar agricultural greenhouses mode has only just started, and a demonstration area solar installed capacity is generally small, and there is no large-scale promotion, also exist such as higher initial investment costs, the combination of solar panel  power generation and the production of crops critical immature technology, the operator protection technology is not in place, as well as the proportion of state funds to support, not high. 

(A) The initial investment cost is high, the agricultural enterprises or farmers alone can not afford 

Currently, most of the amorphous silicon thin film photovoltaic solar cell production lines introduced from abroad, domestic enterprises do not grasp the core technology of the solar cell manufacturing, climbing gradually combined with raw material prices in recent years, China's solar cell production into higher. According to the survey, a non-crystalline silicon thin film solar panels (1.4 m long, 1.1 m wide) the domestic price of 1000 yuan or 1 watt 6 yuan, 2/3 of the area of ​​an acre facility agriculture's roof to install solar panels (solar installed capacity of 50 kW), only the solar panels at least 300,000 yuan, plus the installation fee, controllers, transformers, distribution box and battery, may be as high as 500,000 yuan, the entire film photovoltaic solar The total investment of the agriculture greenhouses (glass greenhouse type, with heating, cooling and ventilation), probably need to nearly 100 million. From Table 1, China's under construction or have been built thin-film photovoltaic solar energy demonstration greenhouses, are all directly by the local government investment, larger only enterprise fund to participate. Therefore, if there is no government funds invested entirely borne by businesses or individuals, the burden of pressure is not conducive to a large area facilities on agricultural greenhouse. 

(B) thin-film photovoltaic solar cells and the production of crops combined key technologies immature 

Traditional solar cells is crystalline silicon cells and not translucent, in recent years, the rapid development of thin-film amorphous silicon solar cells, the biggest advantage of this solar cell can be opaque, and low temperature coefficient, rainy and foggy day on a cloudy day power, perennial cumulative power generation than crystalline silicon cell power generation efficiency can be increased by about 20%. According to the survey, such thin film solar battery is the maximum absorption peaks at 400-600nm (Fig. 3), while the effective spectrum of plant photosynthesis 440nm blue and 660nm red region (Figure 4), in theory the thin film solar cell maximum absorption peak of the absorption peaks plant photosynthesis does not conflict with light film spectroscopic techniques can be absorbed by plants through solar panels for plant photosynthesis and other light used to generate electricity. But the application of this technology in facilities for agricultural greenhouses, whether completely does not affect the normal growth of the plants also lack of early experimental studies, and spectroscopic techniques and solar cells combine scientific, but also a new topic Now research rarely explored. 
(C) have been completed and the thin-film photovoltaic solar agricultural greenhouses demonstration project, combined with agricultural production is not close 

Large and small, in several provinces of China thin film photovoltaic solar agricultural greenhouses have been built over 20, but most are conceptual demonstration project. Shandong, Jiangxi demonstration sites research found that most of the thin film photovoltaic solar cell agricultural greenhouses built are not fully utilized, shed little grow crops, even just one can make use of solar power greenhouse, shed and does not have any crops . , Thin-film photovoltaic solar agricultural greenhouses as a new thing, is only a conceptual show, not closely integrated and effective agricultural production, did not play a win-win results for both the use of solar power generation, but also for crop production and kill two birds with one stone. 

(D) inadequate facilities and operational security technology is not in place, leading to the practical application of the effect is not ideal 

Since most of the thin-film photovoltaic solar agricultural greenhouses only a demonstration, shed and agricultural production facilities such as cooling and heating facilities. Most of our four distinct seasons, generally high summer temperatures and low winter temperatures, if the completed film photovoltaic solar agricultural greenhouse cooling and heating facilities, hot and cold season, it is difficult to guarantee for crop normal production. And most agricultural enterprises and farmers, growers do not grasp the day-to-day maintenance and upkeep of the solar cell technology, many solar cell processing enterprises built greenhouses and the subsequent operational security technical services, once the solar battery problems it is difficult to guarantee normal run, have been completed and most of the thin-film photovoltaic solar greenhouses application the result is not the ideal situation. 

(E) the amount of solar power and agricultural production with consumption not match with the local power grid and there are greater difficulties 

Thin-film photovoltaic solar greenhouses using solar power, the electricity can also be applied to the shed crops corresponding production facilities such as cooling and heating facilities, but does not match the power generation and electricity consumption. For example, in the hot summer and cold winter, the solar power is far less than the agricultural production of electricity, on the contrary, if the weather in general, solar charge controller power will exceed agricultural production of electricity, excess power generation amount. The solution is with the local power grid grid, but with the local power grid and high cost, and network requirements harsh conditions.