Design Principles for Solar Mounting Systems

I. Structural Strength and Load-Bearing Capacity

     First, the system for solar energy installation needs to have sufficient sturdiness.It must be able to bear the weight of solar panels, and also resist forces from wind, snow, earthquakes and so on.During the design phase, calculate specific values based on the climatic conditions of the site.In windy areas, wind resistance is relatively large; in snowy areas, the load formed by snow should be considered.A mounting system's design life usually reaches 25 years or longer, and the structure needs to have sufficient safety margins, and should not be designed under the absolute limit.Use engineering software to conduct stress-related analysis (stress analysis), a good design will do this, in order to ensure that the structure does not deform or collapse under extreme weather conditions.

II. Material Selection and Corrosion Protection

     The installation system stays outside for a long time, so the materials used need to be able to resist corrosion.Two common high-quality choices are anodized aluminum alloy and hot-dip galvanized steel.The thickness of the oxide layer formed by aluminum alloy is greater than or equal to 15 microns, and the thickness of the coating possessed by hot-dip galvanized steel is greater than or equal to 65 microns.All exposed bolts, nuts, washers shall be made of 304 or 316 stainless steel.If in an environment near coasts or industrial areas, 316 stainless steel can be used to better resist salt spray and acid rain.Outdoor electrogalvanized products or products that have been spray-painted at relatively low prices will rust quickly, do not use these types of products.If proper materials are used, the mounting bracket can last for 25 years.

III. Thermal Expansion and Contraction

     Metal materials will expand or contract as the temperature changes.Solar mounting brackets have guide rails, which can be several meters or even tens of meters long. During temperature changes in midsummer and midwinter, the length of the guide rails may change by several millimeters.The connector is too hard, the bolts may loosen, the track will bend, the solar panels are damaged due to the stress caused by thermal expansion and contraction, "the connector design is too hard may cause bolts to loosen, the track to bend or the solar panels to be damaged due to thermal expansion and contraction stress".For the connecting parts of rails, a good design either sets expansion joints or uses sliding connectors to allow the material to move.This seemingly unimportant detail directly affects the long-term stability of the system.

IV. Drainage and Water Accumulation Prevention
     The installed structure must have no places where water can accumulate.If there is moisture in the track grooves or connecting components, the moisture will freeze and expand in winter, causing the material to crack; in summer, the accumulated water will accelerate the corrosion process of the material.Design to equip the components with drain holes or inclined surfaces so that rainwater can flow out naturally.The lowest point of the mounting structure should not directly touch the roof or the ground, and at least a few centimeters of gap should be left for ventilation and to keep it dry.It is very critical for flat roof or ground installations.Water cannot be drained, and even top-tier materials can hardly maintain their performance (state) for a long time.

V. Ease of Installation and Maintenance
     When designing the bracket, you need to consider good scenarios, performance aspects, ease of installation, and future maintenance conditions, where "maint" is the abbreviated form of "maintenance".Guide rail and fixture are fitted with buckles / small parts are released through quick unlocking, so that workers can install faster and reduce damage to parts during installation.Leave enough working space next to the installed system, with at least a 60-centimeter passageway, for future panel cleaning and circuit inspection.The direction of the bolts must be kept consistent, don't always adjust the angle of the tool (the bolts should be kept in the same direction to avoid repeatedly adjusting the tool angle).The design is more comprehensive, the on-site installation is smoother, and there will be fewer maintenance troubles in the future.

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