PV system can be installed in a variety of occasions, different occasions and environments, and even the same type of mounting system, according to different roof structure, the surrounding environment, meteorological information, etc. will require the use of different mounting structure, therefore, the need to install the site of the site for a detailed site investigation in order to design and adopt the most compatible with the PV system of the structure form.

Strength, stiffness, stability and reliability requirements of PV system

The structural design should meet the requirements of strength, stiffness, stability, and the design service life should not be less than 25 years. Reliability directly affects the system's power generation and thus investment returns, while the 25-year service life of the system reliability puts forward high requirements, which requires the system in harsh climates such as storms, snowstorms and even earthquakes, floods and other natural disasters can still be stable and reliable operation. At the same time to avoid problems such as premature aging of materials and serious corrosion.

The strength, stiffness and stability of the installation structure needs to be designed according to the most unfavorable situation in the combination of load effects (self-weight, wind load, snow load, maintenance load and other combinations).

Third, the photovoltaic system to ensure the power generation and economic requirements

Photovoltaic system design, component installation tilt and pitch are two very important parameters, directly affecting the system's power generation. Installation tilt and azimuth angle is generally determined by the latitude of the location and the characteristics of the installation occasion, installation tilt and spacing generally follow the winter solstice 9:00 ~ 15:00 components are not blocked the principle of design.

In the actual engineering design using professional software for different tilt angle of the system power generation, system costs, floor space (land costs) for a comprehensive economic assessment in order to obtain the best return to determine the best installation tilt angle.

Fourth, the building safety requirements of photovoltaic systems

Installed in the building roof of the photovoltaic system in the design and construction process need to pay attention to the following issues:

1, The need for the building's bearing capacity accounting, to confirm whether it can be installed or need to be reinforced before installation;

2, Should avoid destroying the original waterproof layer of the roof, such as destruction, need to be re-waterproofing treatment to ensure that no water leakage problems, the design should be prioritized in the form of non-destruction of the roof;

3、Photovoltaic arrays should be avoided to be installed across the expansion joints, settlement joints and deformation joints of the building, in order to avoid the leakage of components and dislocation of faults when the building undergoes deformation and displacement;

4, PV module as balcony enclosure installation, need to meet the relevant building code requirements, such as middle and high-rise residential balcony railing should not be less than 1.1m;

5, parallel to the roof installation, there should be enough ventilation and heat dissipation gap, ventilation and heat dissipation will have an impact on the PV system power generation;