Solar photovoltaic power generation system is based on component capacity computing system

In some places, the capacity of the photovoltaic system is according to the component to calculate system capacity, then according to the components of the actual output power to select the inverter, in order to avoid inverter current limit, according to the actual situation, the component and the inverter can be 0. 9:1 to 1. To configure 4-1. But the

in some places, pv systems system capacity is calculated according to the capacity of the component. At this point, the component based on the actual output power to select the inverter, so as not to limit current of inverter. According to the actual situation, components and inverter can be configured to 0. 9:1 to 1. 4:1. However, in some places, the system capacity is calculated according to the ac output power of inverter. If power selling prices are relatively high, and parts of relatively low price, you can increase the power of the component, in order to increase the output as much as possible. Components and inverter can be configured to 1. 4:4 to 1. 8:1, the number of components depending on the inverter can be connected. In the photovoltaic (pv) grid system, power inverter related components, components and inverter power match is not 1:1 fixed ratio, requires a combination of project specific situation into account. Main influence factors including the irradiance, system loss, efficiency of inverter, inverter, the inverter voltage range life, component installation Angle, etc. 1, component installation Angle, and azimuth Angle when the object plane vertical Yu Guangshi completely, the received power is very large. If the object is tilted, the plane form a certain Angle and light, the received power will be discounted. For the same area, the received power will be much smaller. Is the Angle between the vertical component and the sun, the power is very large. 2. Irradiance module power output of the installation area and irradiance. In solar energy resource-rich regions, due to the sunny days less cloud cover, air good air quality, atmospheric transparency is high, thus reach the surface of the module of solar radiation is much higher than average for resource-poor Settings. 3. The higher height of installation height empty, the rarer the air is, weaken the less solar radiation, atmosphere to reach the more solar radiation on the ground. For example, the qinghai-tibet plateau is a strong solar radiation area. The air is thinner, the inverter heat dissipation. If more than a certain height above sea level, inverter to reduce the speed of operation. 4. DC side system efficiency in the solar system, the energy from solar radiation to the photovoltaic module, and through the DC cable, junction box and reach inverter DC power distribution network, each link has a loss. Different design schemes, such as centralized, serial, distributed, etc. DC side loss, there are different. 5, inverter frequency converter cooling conditions should be installed in a well-ventilated place, avoid direct sunlight, is conducive to heat dissipation. If the inverter must be installed in an enclosed area for heat dissipation due to space limitation of, should consider to inverter derating problems, and should be equipped with fewer parts. 6. Power component is tolerance: in order to satisfy the photovoltaic modules 25 years attenuation is not more than 20% of the requirements, many components factory is 0 - for new delivery of the components 5% positive tolerance, such as 265 watts components, the new delivery of the components of the actual power may be 270 watts. 。 Negative temperature coefficient: parts of power supply system is about - temperature 0. 41%/℃。 When the component temperature drop, parts of power will increase. Sunny areas in China, such as northern ningxia, northern and southern xinjiang, gansu province, if you don't consider equipment loss, 250 tile module power output may be over 250 watts.