By 2019, China's household photovoltaic, the cumulative installed 10.1GW, the number of installed users reached 1.085 million! Although there are so many residents at home installed photovoltaic power stations, but there are still a lot of friends for the photovoltaic power station is not very understanding, today, Yingli Green Energy is about some tips before and after the installation of photovoltaic power stations.
Is there any requirement for the roof orientation of the installation of the photovoltaic power station?
Photovoltaic power station needs to consider the lighting problem when installing, if it is not a bungalow, then the orientation of the roof has a certain impact on the lighting, from the current installation case, the roof installation is the best effect, the roof is the worst effect, the power generation of the two may be at most double the gap.
Can the roof of the tile structure bear the weight of the photovoltaic power station?
From the current power station case, the weight of the photovoltaic power station is not more than 20KG / square meter. Generally speaking, most roofs are far beyond this load-bearing capacity, so it is no problem to install the power station.
After the installation of the photovoltaic power station, can the power be used in rainy days?
Because the photovoltaic power station system is a power generation system connected to the state grid, if the power generation of the power station is insufficient, the system will automatically switch to use Guodian, so even in the rain and snow weather, the photovoltaic power station can not generate electricity normally, the household electricity will not be affected by any.
If there is dust on the surface of the photovoltaic panels, does it have an impact on the power generation?
It is necessary to see the thickness of the dust, because the power generation of photovoltaic power stations is directly related to the irradiance of the sun. If the amount of dust is not large, without causing obvious shadow cover, there will be no obvious impact on the power generation.
How safe is the photovoltaic power station?
At present, the safety of the photovoltaic power station is generally high. The main components of the power station, such as the DC junction box and the inverter, all have the functions of lightning protection and overload protection. All the metal frames and brackets on the roof will be grounded to effectively ensure the safety of thunderstorms. Secondly, the surface of photovoltaic modules are super impact resistant tempered glass, the general climate is difficult to hurt the photovoltaic panels.
What is the reason for the block of dust shown above on the photovoltaic panels?
Dust accumulates in the lower right corner, indicating that this position is relatively low. When the photovoltaic panels accumulate ash, in rainy days, with the rain erosion, the dust will accumulate here. Therefore, after the rain day, the owners should pay attention to clean the photovoltaic panels, because the solar panels for a long time of ash, will produce thermal spot effect, may cause spontaneous combustion of the components.
What is the local shadow shade of photovoltaic power generation?
Simply put, the photovoltaic modules are covered by external objects, such as guano, fallen leaves, etc. It may also be blocked by other building facilities, pictured below. The occlusion of photovoltaic modules for a long time will produce a thermal spot effect, which may lead to a fire in the power station. Therefore, during the operation and maintenance process of the power station, the photovoltaic modules will be regularly cleaned to clean up the surrounding building facilities that may block the photovoltaic modules.
Warning of hot spot effect:
In the long-term use, the photovoltaic modules will inevitably fall on the bird droppings, dust, fallen leaves and other shelters (which may also be blocked by trees, other buildings, etc.), and these blocks will form a shadow on the photovoltaic modules. Due to the existence of local shadows, the current and voltage of some individual cells in photovoltaic modules change. As a result, the product of the component local current and voltage increases, resulting in a local temperature rise on these battery components. At this point, the shaded part of the series branch will be treated as a load, consuming the energy generated by the other unshaded solar cells, so the shaded part will heat up at this point, which is the hot spot effect.