Dirty solar panels can cause solar system, cell, and panel failure, especially in Florida. You’re not alone, and Solar Service is here to help. Here is a brief summary of what happens. We invite you to download our white paper for a detailed analysis.
Overheating
Overheating of solar panels and cells is caused by soiling/shading. The soiling of solar panels is a form of shading that won’t disappear unless cleaned. Solar systems are shaded, creating hot spots.
How do hotspots form? Solar cells, panels, and systems are designed to be interconnected. When one panel or cell is exposed to different levels of sunlight (as measured by voltage/amperage), it can stress the entire system. The soiled cells, which are designed to be conductors, act like resistors. This stress leads to system components degrading and breaking down.
Imagine a heart attack. A dirty solar panel or cell is like a clogged artery. If enough cells stop functioning properly, it can cause a “heart attack” in your solar system.
The frame design of the solar panel and its installation angle are practical considerations. Most solar panel frames catch water at the bottom, which can contain dirt. This soiling causes cells to overheat. A dust layer on the lower edge of a solar panel likely causes partial shading.
The cell acts as a resistor, generating heat that can damage the surrounding materials, such as the back-sheet and protective layer. This can shorten the panels’ lifespan and jeopardize their safety.
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“Hot-Spot Heating Leads to Irreversible Destruction of Solar Cell Structure”
Many studies have linked soiling to hotspots, with some sources stating that it is the main factor. According to the National Renewable Energy Laboratory (NREL), “Soiling can reduce the energy output from the PV array and lead to localized failures if soiling is uneven.” It is important to take steps to minimize uneven soiling.
Solar Panels Need More Than Rain to Be Cleaned
A common myth is that rain can clean your panels. Most serious discussions on the effects of soiling shift the focus to the cost-benefit of cleaning solar panels versus production losses.
Pollen Plus Humidity? Be Alert
The idea that rain will clean your panels is inaccurate, especially in commercial installations and residential areas where it does not rain often. Rain can remove loose soiling particles but not much more. If dust, pollen, or grime has settled on your panels, rain is not enough. In humid environments, the problem worsens. Rain is insufficient to clean panels covered with sticky pollen and dew. Part 4 of our white paper provides a detailed explanation.
In humid climates, it is normal to see a thin layer of dew covering the grass. This, coupled with frequent pollen shedding, can be dangerous for solar owners. The “stickiness” of pollen and dew creates a cement-like material on your solar panel every humid morning when pollen falls.
Corrosion
Corrosion is another problem for solar systems. Solar panel protectors can degrade over time due to dirt and improper cleaning, making a system less effective or ineffective. Degradation is usually caused by abrasive processes, such as sand particles scratching the surface during a dust storm, improper cleaning, or chemical bonding of particulate material to the surface.
Solar system owners can take measures to avoid high levels of chemical adhesion of particulate soiling on the surface and prevent damage when removing such bonded layers. The white paper below will help identify these precursors to chemically-bonded dirt for preventative maintenance.
Conclusion
Was that a lot? Don’t worry. We can take care of all of this with a simple text or call. We offer memberships, cleaning services, and we are always available to maintain your solar system.
The summary of all that is just the beginning for those interested in the science behind solar. It doesn’t even begin to scratch the surface of the long-term effects of soiling on solar systems. Below is a link to a detailed analysis. We hope this article has provided a solid introduction to the fact that soiling can lead to hotspots, which can eventually cause system and component failure.
This post was written by a professional at EHS. Efficient Home Services of St. Petersburg FL is a solar energy company offering a variety of services. At Efficient Home Services of Florida, our mission is to save you money on your solar panel cleaning Florida. No other home energy company serving Florida offers the range of cost-saving solutions that we do. Whereas other businesses might focus on one component of a home’s energy use, such as solar panel installation or HVAC unit installation, EHS provides services across the spectrum to address every aspect of your home’s energy inefficiencies. We are a team of knowledgeable professionals who banded together to give homeowners what other companies promised but could not deliver – real relief from high electric bills.