Component surface shading effects on photovoltaic power generation system power generation

A 10 kw power plant, customer response capacity is not high, the power is on August 11, 2017 and the net, until August 29, a total of 500 degrees, considering that there are 4 days is the heavy rain, the actual power generation number is 15 days, an average of about 33 every day. 3 degrees, and the annual average difference not

a 10 kw of power plant, the customer response capacity is not high. Power station is a network, on August 11, 2017. As of August 29, with a total capacity of 500 degrees. For the four days of heavy rain, the actual power days for 15 days, an average of about 33 every day. 3 degrees, similar to the average year. However, August is the peak period of photovoltaic power generation. Zhongshan installed capacity of the same plant, 10 kw, about 40 - every day 50 degrees. There are many influence factors in power generation, such as components, inverter, cable quality, installation location orientation, obliquity, dust, shadow, system scheme, circuit design, construction, power grid voltage and other factors. Let's check them one by one. The module adopts 265 Havana, crystal, 40, 20 pieces of series, 2 way connected to the electricity grid. DC cable used special photovoltaic dedicated 4 mm cable, communication cable with 4 mm BVR type copper wire diameter, ac switch adopts 500 v20a, inverter without leakage alarm, power grid voltage alarm information, such as electrical system design and circuit meet the requirements. These components are the same color, almost no color difference. These components is a new installation, clean dust-free surface. Component installation direction Angle is the south. The slope Angle of the panel PV1 is about 5 degrees, the slope Angle of the panel p2v is about 15 degrees. From 10:00 a. m. to 12:30, two hours, the peak power of the panel 1 is about 4580 watts, the peak power of the panel 2 is about 3880 watts. Disconnect parts and inverter wiring, panel PV1 open circuit voltage of 648 v, panel p2v open circuit voltage of 635 v, voltage difference is very small, showed that components, inverter, installation Angle, structure, etc. No problem. According to the further observation, doubt is most likely to influence factors of power generation is the shadow. PV1 panel with metal fence in the east, west, north direction, p2v panel with metal fence in the south and north direction. It is close to the component, about 0. About 0 2 meters, higher than the component. 5 meters. In order to determine the shadow effect the power of the system, at the side of the power station erected a metal bar to see the shadow. About 11 o 'clock in the morning of 10 points, the sun moves from east to west. Panels PV1 is 3230 watts of power to p2v is 3640 watts of power to the component difference is 410 watts of power to about 12%, because some shadow falls on the east panel PV1 guardrail, toward the east panel p2v no guardrails. On the afternoon of 12:30, test during the day the sun is very strong. The sun from south to north. PV1 panel peak power of 4580 w, the peak power of 3880 watts p2v panel, order of PV1 panel and peak power is 700 watts, 18% larger than the peak power of p2v panel, because the south barrier has a shadow. Vertical installation components. At this point, the shadow covers the lower part of the five components, has a great influence on the system of power generation. The shadow on the surface of a component of photovoltaic power generation system power generation has a great influence. Preliminary estimates for the 10 kw system, its surrounding fence will affect system capacity by 15% to 20%. Therefore, in the design, should consider the surrounding environment as far as possible, avoid the sun.