How to improve the efficiency of photovoltaic systems and stabilize the income?

- Jan 09, 2019-

In most rural areas, solar panel photovoltaic systems are often installed on the roof, but the rural construction environment is complex and diverse, many systems are well built, and solar panels are not ideal for photovoltaic power generation, making users really anxious. The power generation of photovoltaic systems mainly depends on two key equipments: solar panel photovoltaic modules and photovoltaic grid-connected inverters. Among them, solar panel photovoltaic modules are most susceptible to the surrounding environment, and long-term occlusion can cause component hot spots to damage the photovoltaic components.


What are the main obstructions for solar panel photovoltaic power stations?


These obstructions of solar panels are mainly trees and vegetation distributed around photovoltaic power stations, buildings, natural terrain, dust, dirt, bird droppings, fallen leaves, and natural terrain common in mountainous areas.


In the long-term use of solar panel photovoltaic system, it is inevitable to fall on the obstructions such as birds, dust, leaves, etc. These obstructions form a shadow on the solar cell module. Do not think that it will not be blocked if it is not blocked during the survey, and some trees may not block. Photovoltaic arrays, but after several years of growth, new branches and leaves may become sources of occlusion. Other buildings here include neighboring buildings on site, especially newly constructed buildings that are likely to be the area currently suitable for installing photovoltaic systems.


What are the effects of blocking solar photovoltaic panels?


When the solar panel assembly is blocked, it will induce the bypass protection component in the junction box behind it to start. The DC current of up to 9A in the component string will be instantaneously loaded onto the bypass device, resulting in local current and voltage of the solar module. The product increases, resulting in a local temperature rise on these battery components, which will generate more than 100 degrees of high temperature in the junction box. This phenomenon is called "hot spot effect". This high temperature has little effect on the panel and junction box in a short period of time, but if the shadow effect is not eliminated and exists for a long time, when the hot spot effect reaches a certain level, the solder joint on the component melts and destroys the grid line, resulting in the entire sun. Scrap of battery components. Obviously, the occlusion seriously affects the service life of the junction box and the panel, and seriously affects the power generation and reduces the revenue.


How to solve the problem of solar panel occlusion?


First, plant occlusion: in the survey and installation to fully consider the plant's growth year, consider whether the shade, branches and leaves cause occlusion, if there is occlusion can be cut.


Second, the corner guard: the corner shield is also present at the scene, but the number is not a lot, the general corner will be taken off directly.


Third, the terrain difference occlusion: here the terrain difference should take into account the north and south of the component, whether the components cause shadow occlusion; the same array of different sub-array heights cause occlusion; at the same time the shadow between the floors should also be considered.


4. Blocking of mud, bird droppings, sand dust, etc.: After the power station is built, mud, bird mites, sand dust, etc. will block the components, which should be checked and cleaned regularly.


We remind you to regularly inspect the component array, clean and remove all kinds of fixed obstructions on the surface of the component and surrounding, and do not neglect the impact of shielding on the solar panel photovoltaic power station. Only by doing this, solar panel photovoltaic system can achieve the original intention of user construction: improve efficiency and stabilize income!