What factors reduce the longevity of the solar panels?

What factors reduce the longevity of the solar panels?
Having full information about the standards and equipment certificates is very important before you buy them. Unfortunately, sometimes, engineers and activists in this area refuse to provide any technical information about the product at all costs, or the buyer does not have any information beforehand and trust the seller of the product. For example, a person planning to build a solar power plant in a desert or wet area needs to make sure that the panel he intends to purchase has the Salt Mist Resistance Standards. Also, the use of polycrystalline panels in tropical regions is optimized and with lower losses than monocrystal panels. In some cases, the installer of these systems ignores the shadowing effect due to inadequate power plants, causing a hot spot or a hot spot to shorten its life.