Grid-connected photovoltaic power generation integrated with buildings is currently a key application of distributed photovoltaic power generation. Technological progress in this field is rapid, primarily in terms of installation methods and the electrical design of building-integrated photovoltaics. Depending on the method of integration with the building, these systems can be classified as Building-Integrated Photovoltaics (BIPV) or Building-Attached Photovoltaics (BAPV). The definitions are as follows:
BIPV: A photovoltaic system that utilises specially designed modules to replace existing building materials or structural components during installation, thereby becoming an integral part of the building. If the photovoltaic modules are removed, the building cannot be used normally. The modules must not only fulfil the functional requirements of photovoltaic power generation but must also, first and foremost, meet the basic functional requirements of the building, such as durability, thermal insulation, waterproofing and moisture resistance, as well as appropriate strength and rigidity. Common examples include photovoltaic tiles, photovoltaic curtain walls, photovoltaic canopies, photovoltaic windows, and photovoltaic awnings or sunshades.
BAPV employs standard photovoltaic modules installed on existing buildings without replacing building materials or structural components; these systems are mounted directly onto roofs or attached to walls. Removing the photovoltaic modules from such buildings does not affect the basic functions of the original structure.

You can check the operational status via a mobile app, which will trigger an alert in the event of a fault. There is no need to assign dedicated on-site staff. Furthermore, Longxing uses equipment and materials from leading domestic brands, resulting in an extremely low failure rate; apart from routine cleaning, virtually no maintenance is required.

A BIPV system integrates a photovoltaic power generation system and constitutes a structurally complete, high-quality metal roofing system that meets architectural design requirements. It comprises all necessary roofing components, including purlins, inner panels, insulation, outer panels and the photovoltaic layer. Traditional distributed rooftop PV, by contrast, involves installing a photovoltaic system on top of the existing roof.

The main types of roof installation include flat roofs, pitched roofs and photovoltaic skylights. Among these: photovoltaic arrays on flat roofs can be installed at the optimal angle to maximise power generation, and conventional crystalline silicon photovoltaic modules can be used, reducing module investment costs and offering relatively good economic efficiency; however, the aesthetic appeal of this installation method is generally limited. In the Northern Hemisphere, photovoltaic arrays can be installed on pitched roofs facing due south, south-east, south-west, due east or due west. On south-facing pitched roofs, installation can be carried out at the optimal orientation or close to it. Facade mounting primarily refers to the installation of photovoltaic modules on the south, west or east walls of a building. For high-rise buildings, the walls represent the external surfaces with the largest area exposed to sunlight; photovoltaic curtain walls are a widely adopted application method.

The roof panels and the photovoltaic layer are connected using silicone structural sealant. Silicone structural sealant is a high-modulus adhesive that is easy to use, capable of bearing structural loads, and possesses excellent resistance to UV ageing as well as high temperatures and humidity. Its superior mechanical properties ensure excellent stability in operating environments ranging from -50°C to 180°C, maintaining elasticity without becoming brittle, cracking or tearing. Consequently, it is widely used in structural engineering assemblies. Currently, its most common applications in construction include structural assemblies for building curtain walls, high-rise building curtain walls, large-scale glass panel curtain walls, structural assemblies for complex architectural curtain walls, and insulated glazing, amongst others.

1. By selecting high-efficiency monocrystalline PERC cells with M6 gallium-doped silicon wafers and opting for the more reliable double-glass encapsulation for module assembly, power degradation is ensured to remain below 15% over 30 years.
2. By designing dedicated heat dissipation channels to mitigate power generation losses caused by heat dissipation in BIPV systems.