I. What are the installation methods for a rooftop photovoltaic power station?
1. Concrete foundation installation: (1) According to the construction method, it can be divided into: precast cement foundation and direct casting foundation. (2) According to its size, it can be divided into: independent base foundation and composite base foundation. (3) Scope of application in distributed photovoltaic power stations: concrete flat roof.
Advantages: Strong load-bearing capacity, good flood and wind resistance, reliable stress distribution, does not damage cement roof, good strength, high precision, and simple and convenient construction without the need for large construction equipment.
Disadvantages: Increased roof load, large amount of reinforced concrete required, more labor, longer construction period, and higher overall cost.
2. Clamping Installation: Materials include aluminum profiles, hot-dip galvanized steel, aluminum alloy, and stainless steel. Mainly used for corrugated steel tile roofs and glazed tile pitched roofs.
Features: Lightweight, low cost, high reliability, and easy installation.
II. What are the precautions for installing a rooftop photovoltaic power station?
Rural roofs mainly fall into three categories: corrugated steel roofs, brick and tile roofs, and flat concrete roofs. These three types of roof structures differ significantly, and even for the same area, the methods for installing photovoltaic power generation systems will differ. Today, we'll discuss some issues to consider when installing a photovoltaic power station on a corrugated steel roof:
1. Site selection considerations for rooftop photovoltaic arrays: (1) Roof structure (fixed supports, ensuring waterproofing). (2) Purlin spacing, direction, and dimensions. (3) Roof structure and module arrangement. (4) Avoid shading.
2. Ensure proper waterproofing: When installing a photovoltaic system, ensure that the installation does not damage the roof. Avoid drilling holes in roofs with waterproof layers; for corrugated steel roofs, use waterproof adhesive or gaskets if drilling is necessary.
3. Component placement: During installation, the length and width of the components should be determined based on the roof area. Placing the components with their long sides perpendicular to the roof joists saves on bracket costs. Wiring channels should be reserved during installation.
4. Steel Structure Roof Load: Generally, installing photovoltaic power generation equipment on a steel structure factory building adds 15 kg of weight per square meter. Large commercial buildings usually have original design drawings of their roofs. If we can obtain these drawings before the site visit, we can understand the roof structure and electrical structure distribution in detail. We should check whether the roof load meets the installation requirements using the drawings, review the design values of the dead load in the architectural design specifications, and confirm whether there are any additional loads besides the roof's self-weight, such as pipes, suspended equipment, roof accessories, etc., and determine whether there is sufficient margin in the dead load to install the photovoltaic power station.
