Knowing how to clean solar panels safely will help you maximize their efficiency and ensure your system lasts longer while maintaining optimal energy production. Specifically, dirt, dust, and debris block sunlight and impact the panels’ performance, causing plenty of solar power to go to waste.
Thus, it’s clear that cleaning is a significant part of solar panel maintenance. Regular upkeep not only enhances energy output but also helps prevent long-term damage and costly repairs.
In this article, we’ll explain how to clean solar panels step by step and offer some helpful solar panel cleaning tips. Additionally, we’ll list the most common mistakes to avoid when cleaning solar panels at home. Let’s begin!
The Importance of Cleaning Solar Panels
The importance of cleaning solar panels is multifold—it increases the system’s efficiency, prolongs the panels’ lifespan, and improves your home’s aesthetic appeal. In contrast, neglecting care can lead to a drop in the panels’ performance and higher repair or replacement costs down the line.
So, without further ado, let’s elaborate on the benefits of cleaning solar panels:
#1. Increasing Efficiency
Your whole system’s performance depends on the solar panels’ efficiency, which, in turn, largely depends on how clean they are. Simply put, dirty solar panels soak up less sunlight, meaning less solar energy to power your home. As a result, your savings on electricity bills, which are typically part of the reason for going solar, could be significantly reduced.
Regular cleaning helps ensure your panels can absorb as much sunlight as possible, keeping them working at peak performance. Over time, small amounts of dirt and debris can pile up, leading to noticeable drops in energy production. Therefore, by maintaining a clean surface, you protect your investment and maximize the return on your solar energy system.
#2. Prolonging Lifespan
Solar panels typically last for 25 to 30 years. This means you can enjoy the benefits of solar power for a long time, even when you factor in the somewhat shorter lifespan of other components, such as the inverter, batteries, and solar generator.
However, if you don’t clean your panels regularly, the layers of dust and debris can trap moisture and lead to corrosion or damage to the panels’ surface or wiring. This can cause the panels to overheat, reducing their effectiveness and possibly shortening their lifespan.
At this point, you may need to do damage control by investing in expensive repairs or replacements. With this in mind, it’s safe to say that taking some time to remove dirt from solar panels is a lot less hassle.
#3. Improving Aesthetic Appeal
Once you switch to solar power, solar panels become a prominent part of your home’s exterior. Their appearance depends on how well you maintain them.
Many people rely on rain to rinse the dirt off their panels. However, it doesn’t work that way—just like you need to wash your car windows and windshield more during the rainy season, you also need to clean solar panels. Raindrops leave stains on glass-like surfaces, making them look smudged and dilapidated.
In contrast, regular cleaning will make your panels shiny and reflect well on your home’s care. Not to mention, such a sight may even attract potential buyers and raise your estate’s market value.
Tools You Need to Clean Your Solar Panels
The right solar panel cleaning tools will effectively remove all the piled-up dirt, dust, and debris and give your panels a nice, polished look without damaging their surface.
These are the tools you should use:
- Soft cloth or sponge. The best material is microfiber, as it’s not abrasive and can trap dirt without leaving any residue. Still, be sure to use a clean cloth each time to avoid reapplying dirt or dust.
- Mild soap solution. A solar panel cleaning solution has to be strong enough to remove stains yet mild enough not to cause damage. You can use a few drops of dish soap mixed with water—this will effectively break down dirt and grime.
- Soft brush or squeegee. If there are persistent stains you can’t get rid of with a cloth, you’ll need a brush. However, it must have soft bristles so that it doesn’t scratch the panels. As for a squeegee, it’s perfect for removing water after cleaning and preventing streaks.
- Water supply. Make sure to use a hose with a gentle flow to rinse off dirt and soap. The water pressure shouldn’t be too high, or you might crack the panels, dislodge some of their parts, or force water into the panels’ electrical components.
How to Clean Solar Panels: 5-Step Guide
Once you’ve gathered all the necessary cleaning supplies, it’s time to learn how to clean solar panels properly. Here’s a step-by-step guide to make the process easier:
#1. Turn Off the System
Needless to say, water and electricity don’t mix, which is why you need to remember to shut the system down before you start cleaning. This way, you’ll reduce the risk of electrical shock or damage to the panels and other components.
Most systems have a disconnect switch, making it easy to turn it off. Still, if you’re unsure how to do it, check the manufacturer’s instructions.
In addition to being dangerous, cleaning the panels while the system is on can also interfere with energy production.
#2. Clean on Cool Days
If you clean solar panels in direct sunlight, the heat can cause water to evaporate, leaving behind streaks and mineral deposits. In the worst-case scenario, pouring cold water on hot panels can lead to cracks due to sudden temperature changes.
For these reasons, it’s best to clean your panels early in the morning, late in the evening, or on an overcast day. Check the weather forecast beforehand just to be on the safe side—after all, cleaning in the heat won’t be comfortable for you either.
#3. Gently Wash Panels
Use a soft sponge, microfiber cloth, or non-abrasive brush to remove dust and debris from the panels. Otherwise, you risk scratching their surface, which can reduce their efficiency and shorten their lifespan.
As for the solution, mild soap mixed with water is usually enough to break down dirt without damaging the panels. When you scrub, do it gently—even if the panels are heavily soiled, you shouldn’t put too much pressure. Instead, let the soapy water sit for a while before wiping it away.
Finally, if you have a roof-mounted system, it’s best to clean solar panels from the ground with an extendable tool instead of climbing onto the roof for safety reasons.
#4. Rinse With Water
Once you’re done scrubbing, use clean water to rinse the soap and dirt off the panels. A garden hose with a gentle spray setting works best—avoid pressure washers, as they can damage both the panels and their wiring.
If you live in an area with hard water, consider using filtered or distilled water to prevent mineral buildup. Lastly, make sure to rinse thoroughly so there’s no soap residue afterward.
#5. Dry With a Soft Cloth
Letting panels air-dry can leave them with water spots, so it’s best to dry them with a soft, lint-free cloth. Wipe them gently, working in smooth motions to avoid streaks. This way, you’ll give your panels a spotless finish and keep them looking clean for longer.
Moreover, removing moisture helps prevent mineral deposits from forming. A quick wipe-down ensures your panels stay clear and efficient, maximizing energy production.
How Often Should You Clean Solar Panels?
Generally speaking, you need to clean solar panels twice a year. However, the exact frequency depends on several factors. For starters, your location, or more precisely, weather conditions, play a significant role. If you live in an area with heavy rainfall or wind, it’ll take more time for the panels to get dirty, which means you don’t need to clean them that often.
On the other hand, if your region is particularly dry, dusty, or pollen-prone, your panels will likely require more regular upkeep. Additionally, nearby trees or construction sites can increase the amount of debris on your panels, meaning you’ll need to clean them more often.
That said, the best way to determine whether your panels need cleaning is by tracking their output. If your solar system has performance monitoring, you’ll notice a drop in energy production when dirt or debris begins to block sunlight, affecting how efficiently the panels generate power.
Moreover, take the manufacturer’s recommendations into account—they may provide specific cleaning guidelines based on the panels’ materials and design. It’s important that you follow them, not only to ensure optimal performance but also to maintain the warranty.
Lastly, remember to inspect the panels visually every once in a while. If you notice a buildup of leaves, dirt, or bird droppings, it may be time to clean them, even if your performance monitor hasn’t shown a significant drop.
9 Mistakes to Avoid When Cleaning Solar Panels
Now that you know why, how, and when to clean solar panels, let’s take a look at some common mistakes you should avoid during this process:
- Using abrasive materials. Scrubbing with rough sponges and brushes can scratch the panels, making them more vulnerable to moisture and potential cracking.
- Using harsh chemicals. Strong cleaners, solvents, and bleach can damage the panels by wearing down the protective coating on the glass.
- Cleaning during high heat. If you use cold water on hot panels, you risk thermal shock, which can lead to cracks.
- Using high-pressure water. Pressure washers can crack or displace the panels and even damage their wiring, causing a potential hazard.
- Standing on the panels. Panels can be pretty fragile, which is why you should never walk on them.
- Ignoring safety. If you clean solar panels on the roof, make sure to use a stable ladder and non-slip footwear to avoid falling.
- Cleaning without inspecting. Remember to check the panels for any damage or wear and tear so that you can take the necessary steps to fix them in time.
- Using hard water. Avoid using water with high mineral content to prevent water spots and mineral buildup.
- Over-cleaning. Clean the panels only when it’s necessary, as excessive cleaning can speed up their aging process.
Go Solar With High-Quality Equipment
Going solar has numerous benefits, from saving on electricity bills to reducing your carbon footprint. To enjoy them to their fullest, you need high-quality equipment. Fortunately, Portable Sun has you covered—you can choose from a wide range of panels, batteries, inverters, and other solar system components.
Browse our selection today, find the perfect setup for your needs, and start generating clean, renewable energy. Whether you’re just switching to solar power or upgrading an existing system, we’re here to help you every step of the way.
Final Thoughts
Learning how to clean solar panels properly plays a key role in ensuring your system’s optimal performance. Not only will regular upkeep boost your panels’ efficiency and prolong their lifespan, but it’ll also do wonders for your home’s exterior.
By making cleaning a part of your solar panel maintenance routine, you’ll ensure consistent energy production and avoid unexpected drops in performance. A little effort now can save you from bigger issues later, keeping your solar investment reliable and hassle-free for years to come.
How to Clean Solar Panels FAQ
#1. Do I need to turn off the solar panels before cleaning?
You need to turn off the solar panels before cleaning them, especially if you’re working close to the electrical components. Most systems have an easily accessible switch or inverter that allows you to safely shut them off temporarily. This way, you’ll reduce the risk of electrical shock or damage to the system during cleaning.
#2. Is it okay to pressure wash solar panels?
It’s not okay to pressure wash solar panels, as the high pressure can damage the panels and their wiring. Instead, use a gentle hose with a low-pressure setting. Alternatively, you can clean solar panels without water using a soft brush or a microfiber cloth to wipe away dust and debris.
#3. How do I know if my solar panels need cleaning?
You’ll know your panels need cleaning if they appear visibly dusty or dirty or if you notice a drop in their performance. Check for dirt, bird droppings, leaves, and other debris. If you live in a dusty or pollen-heavy area, you may need to clean your panels more often.
Disclaimer: The content on Portable Sun is for informational purposes only. Electrical work can be dangerous—always consult a qualified professional. We are not liable for any injuries, damages, or losses from installation or use. Always follow local regulations and safety guidelines when handling electrical components.