Building Integrated Photovoltaics (BIPV) can be divided into two categories: One is the combination of photovoltaic arrays and buildings, such as photovoltaic roofs and photovoltaic daylighting roofs. The other is the integration of photovoltaic arrays and buildings, such as photovoltaic curtain walls.

　　In these two ways, the combination of photovoltaic arrays and buildings is a commonly used form, especially the combination with building roofs. BIPV is a part of the external structure of the building, which not only has the power generation function, but also has the function of building components and building materials, forming a unity with the building.

　　The construction cost of BIPV is about US$2 per watt, the life cycle is about 25 years, the payback period is about 5-8 years, and the IRR is about 12% (Internal Rate of Return).

　　The advantages of the BIPV solution are as follows:

　　1. Long life.

　　2. Green and environmental protection.

　　3. Improve the technological content of buildings.

　　4. Meet the requirements of architectural aesthetics. Improve its practical value and aesthetic value;

　　5. It can reduce or even eliminate future electricity bills and minimize the increase in energy costs;

　　6. Reduce the temperature rise of the wall and roof, significantly improve the roof thermal insulation performance, and reduce the use of indoor refrigeration equipment.

　　7. It can be integrated with energy storage system and UPS, so that you can use solar energy at any time and use uninterrupted power in the event of a power failure.

　　Lithium-ion battery (LIB) has become the main energy storage solution in modern social life. Among them, lithium iron phosphate batteries are a perfect replacement for lead-acid batteries, and they are the first choice for grid-connected peak shaving, off-grid energy storage, photovoltaic energy storage, UPS, data center and other industries.

　　The BIPV system needs to use an energy storage system to solve the instability of photovoltaic power generation due to changes in sunlight.