How long can rooftop residential solar panels? These reasons for decisive purposes

　　Author ：Iflowpower – Portable Power Station Supplier

A variety of factors affect the production life of the residential solar panel. In the first part of this series, we will introduce the solar panel itself. Residential solar panels are usually sold in long-term loans or leasing, but how long can their panels use? Panel life depends on a variety of factors, including climate, module types, and shelf systems used, and other considerations.

Although the panel itself does not have a specific "end date", the production loss usually forces the equipment to scrap over time. When deciding whether to make your panel run 20 to 30 years in the future, the monitoring output level is the best way to make a wise decision. Degenerative problem According to data from the National Renewable Energy Laboratory (NREL), over time, the loss of output is referred to as degradation, usually a decrease of about 0.

5% a year. Manufacturers usually believe that 25 to 30 years is a time point that happens enough degradation. At this time, it may be considered to replace the panel.

NREL said that manufacturing and warranty industry standards are 25 years of solar modules. Considering 0.5% of the reference annual retardation rate, a 20-year panel can produce 90% of its original capacity.

Panel quality will have some effect on degradation rate. NREL report, the annual rate of high-end manufacturers such as Panasonic and LG is about 0.3%, while some brands have a price reduction rate of up to 0.

80%. 25 years later, these high-quality panels can still produce 93% of their original production, while higher degradation rates can produce 82.5%.

Some manufacturers use anti-PID material build panels in their glass, packaging, and diffusion barriers. A considerable part of the degradation is due to a phenomenon called potential induction degradation (PID), this is some problems encountered by the panel. When the voltage potential of the panel and the ion migration between the semiconductor material and other components of the module (such as glass, base or frame), the semiconductor material is in the ion migration between the semiconductor material and the module.

This will cause the power output capacity of the module to decline, in some cases, will decline significantly. All panels are also subject to photorealized degradation (LID), where the panel will lose efficiency within the first few hours of exposure to the sun. PVEVOLUTIONLABS test laboratory PVEL is represented according to the mass of the crystal silicon wafer varies depending on the panel, but usually results in a one-time, 1% to 3% efficiency loss.

The weather conditions are exposed to weather conditions in weather conditions, the main drive factors of panel degradation. Heat is a key factor in real-time panel performance and degradation over time. According to NREL, environmental heat will have a negative impact on the performance and efficiency of electrical components.

SolarCalculator.com, indicates that the temperature coefficient of the panel can be found by checking the manufacturer's data sheet, which will prove the ability of the panel at higher temperatures. The heat exchange also promotes degradation by the process called thermal cycle.

When the temperature is high, the material expansion, the temperature is lowered, the material shrinkage. Over time, this sports will slowly lead to the formation of microcracks in the panel, thereby reducing output. This coefficient explains how much efficiency is lost per liter in the standard temperature of 25 degrees Celsius.

For example, the temperature coefficient of -0.353% means that the total capacity will lose 0.353% each higher than 25 degrees Celsius.

In its annual module scorecard study, PVEL analyzed 36 operating solar projects in India and found a significant impact of thermal degradation. The annual average annular degradation rate of these projects is 1.47%, but the degeneration rate of arrayed in the cold mountain area is close to half, 0.

7%. The wind is another weather condition that may cause harm to solar panels. Strong wind can cause the panel to bend, called dynamic mechanical load.

This will also cause microcracks in the panel to reduce output. Some shelf solutions have been optimized for strong wind regions, protecting panels from powerful lifting force and limiting micro-cracking. Typically, the manufacturer's data sheet will provide information about the biggest wind that can withstand the panel.

Correctly installed to help solve heat related issues. The panel should be installed in a few inches above the roof so that the flow of flowers can flow and cool the equipment below. Light color materials can be used for panel structures to limit heat absorption.

And the performance of thermally-sensitive inverters and assemblies should be located in the shaded area, CED green technology. Snow is also the same, during a larger storm, it can cover the panel, limit output. Snow will also cause dynamic mechanical loads to reduce the performance of the panel.

Typically, the snow will slide down from the panel because they are very smooth and very warm, but in some cases, the homeowner may decide to clear the snow on the panel. This must be done carefully because the glass surface of the scraping panel will have a negative impact on the output. Degradation is normal, inevitable part of the panel life.

Correct installation, careful snow and careful panel cleaning help to output, but in the end, solar panel is a technology without moving parts, almost no maintenance. Develop standards to ensure that the given panel may have a longer service life and run according to plan, it must be certified by standard testing. The panel is subject to the ITS (IEC) test, which is suitable for single crystal and polycrystalline panels.

EnergySage is indicated that the panel that meets the IEC61215 standard has been electrically tested, such as wet current and insulation resistance. They accepted the mechanical load test of wind and snow, and climate testing to check hotspots, ultraviolet exposure, moisture freezing, wet fever, hail shock and other outdoor exposed weaknesses. The panel specification is also common on the US Insurance Laboratory (UL) seal, which also provides standards and tests.

UL runs climax and aging test, and full range of safety tests. IEC61215 also determines the performance indicators of the standard test conditions, including temperature coefficient, open circuit voltage, and maximum power output. The failure rate of solar panels is very low.

NREL has conducted a study of more than 50,000 systems and global installed 4,500 systems installed in the United States in 2000 to 2015. This study found that 5 panel failure rates in 10,000 panels per year. Over time, the panel fault is significantly improved because the failure rate of the system installed between 1980 and 2000 is twice that of the group after 2000.

System shutdown is rarely due to panel failure. In fact, a study of Kwhanalytics found that 80% of the solar power plant downtime is due to the failure of the inverter, the inverter converts the DC current of the battery board to the available AC power. Photovoltaic will analyze inverter performance in this series of next phase.

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