In recent years, solar photovoltaic power generation has come into people's field of vision, and we see some neatly arranged blue photovoltaic modules on the mountain. Photovoltaic power generation systems will also be found on some large industrial roofs, factory buildings, and some residential areas. Photovoltaic power has begun to enter our lives. Many friends are curious, can solar power also generate electricity? Can we also install a set on our roof?
1. Requirements for the type of roof on which a photovoltaic power system is installed
Generally, it is divided into horizontal roof and inclined roof. Horizontal roof, that is, the roof is flat, and it is mainly cement roof. Inclined roofs include colored steel inclined roofs and terracotta roofs. If divided by region, the south is generally dominated by the inclined roof resources; the central region has both, while the northeast region is mostly terracotta roof resources.
The daily power consumption unit is kilowatt-hour. The installation of solar photovoltaic power generation system is usually calculated in terms of power unit kilowatt. The location of the installed equipment is mainly on the sunny side. The size of the installed photovoltaic power generation system can be calculated based on the area. Refer to the following table for details:
2. Installation conditions of photovoltaic power generation equipment
How are these data calculated? Because photovoltaic modules are placed on a cement roof, the modules need to be tilted at a certain angle to ensure that light enters the photovoltaic modules as vertically as possible. Therefore, it is necessary to use photovoltaic brackets to fix the modules. To avoid shielding between the front and rear rows of modules, leave a certain interval. The size of the gap varies according to the region. Generally, the roof area per kilowatt of photovoltaic modules is about 15 to 20 square meters. The inclined roof can be laid directly on the roof, so the interval can be ignored, and the inclined roof requires a roof area of about 10-15 square meters per kilowatt of components.
安装 When installing a photovoltaic system, first ensure that it is installed without damaging the roof.
For concrete flat roofs, for roofs with waterproof layer, such as covering with asphalt. To avoid making holes in the roof as much as possible, you can use a cement foundation to fix the photovoltaic support. A rubber pad is placed under the cement foundation to protect the waterproof layer and prevent the cement foundation from sliding.
斜 For inclined roofs, tile roofs need to lift the tiles and fix the ceramic tile hooks on the beams or the concrete floor. Therefore, the soil layer under the roof tiles of the construction houses in some areas, the soft soil layer will cause the adhesion of the ceramic tile hooks to decrease, so it is necessary to find a more reasonable way to install; the color steel roof can be clamped or punched according to the type of color steel. Waterproof rubber pads are required for drilling.
3. Power generation of photovoltaic power generation system
For ordinary households, installing a 3-5kW photovoltaic power generation system can meet the daily power needs. For example, a 3 kilowatt system in Hebei can generate about 12 kWh on average per day, which is enough for individual households.
Due to different installation angles, changes in lighting conditions, and differences in equipment, there may be slight differences in actual power generation. If you want the system to achieve a higher price / performance ratio, you need a more reasonable optimization match.
Fourth, the price of installing photovoltaic power generation system
Most people are most concerned about price. According to the current average price of photovoltaic power generation systems in the photovoltaic market, a set of 3 kilowatt photovoltaic power generation systems is about 30,000 yuan a month, and the difficulty of the installation environment and the brand of photovoltaic products will also affect the price level.