The main factors influencing the photovoltaic PR value is what?

1. Light resources and the environment temperature mainly divided into the level of radiation and scattering light resources, peak hours of sunshine, the current industry to obtain the light resource data mainly comes from the weather database, a virtual power plant (asain A) — — Based on the Meteonorm and

1. Temperature lighting light source and environment are mainly divided into horizontal irradiance, scattering, peak sunshine time and other factors. At present, the industry lighting resources data obtained mainly from meteorological database. The preliminary research on the virtual power plants ( 1) — — Based on the meteorological observatory 60 cities between NASA and the comparison of difference of irradiation data ( See the following links) , the data of different database has been briefly introduced, in this no longer discussion. Working temperature generally 10 ~ 30 ℃ higher than the environment temperature. Based on the working characteristics of the module, the output voltage and current may change as the solar radiation intensity and temperature changes. As a result, environmental factors affects the performance of the module, affecting the conversion efficiency of photovoltaic modules. 2. The performance of the pv module conversion efficiency module directly affect the efficiency of the photovoltaic system. Module performance parameters including module conversion efficiency, open circuit voltage, short circuit current, large working point temperature variation coefficient, large working point voltage, current, voltage, temperature coefficient, voltage coefficient of illumination changes, etc. Part of the conversion efficiency is closely related to material and manufacturing process. At present, many battery technology, such as the PERC, HIT, the IBC, LGBC, etc. , has appeared on the market. Of these technologies is constantly updated in order to improve the conversion efficiency of parts. 3. Installation Angle and azimuth Angle of photovoltaic array installation Angle is a key factor in the design of photovoltaic system. Photovoltaic modules for fixed photovoltaic array, usually arranged in the south. Installation Angle design for good installation Angle, and regional longitude and latitude, altitude of the sun Angle, is closely related to the declination Angle, etc. 4. Component dust, shadow mask, set of string does not match in the practical operation of photovoltaic power generation systems, components are exposed to the environment. With the passage of time, a lot of dust will accumulate on the surface of parts, and even some covered by guano, leaf, snow and other parts. However, each of the parameters of the component in pv arrays cannot be completely consistent. These factors often cause does not match the performance of photovoltaic array, and the output power of the array will be lower than expected. 5. Component attenuation photovoltaic power attenuation refers to the component output light increases with time and gradually reduce the phenomenon. The power attenuation of photovoltaic modules include a sudden power attenuation, light attenuation and aging. An attenuation is usually caused by a destructive factors, such as parts of welding, the installation process improper operation and strong influence in the process of using the hail. Attenuation refers to the two photovoltaic modules in the first few days of power attenuation is opposite bigger, then tends to be stable. These three attenuation refers to the components in the long-term use of power attenuation phenomena of the extremely slow. 6. Inverter inverter loss is to point to in the process of converts dc to ac inverter capacity loss caused by, including standby loss, semiconductor switch loss, loss of inductance, etc. Semiconductor switching loss mainly from loss of switch and diode device. The energy loss in the inverter can be measured by inverter DC input voltage, current, ac output voltage and current to calculate.