Solar Panel Cleaning Guide

Are your solar panels not performing as they used to? Layers of dirt, dust, and bird droppings may be the culprit. So, cleaning your solar panels regularly is important for them to function efficiently. If you think rain washes off the dirt, it doesn’t.

You can hire a professional service to clean the solar panels or do it yourself. You can use a soft brush to remove the dust if you’re a DIY enthusiast. A sponge dipped in soap will also rid you of the thick dust layers,

This article will take you through all the details about cleaning and maintaining your solar panels. Let’s jump in without further ado!

Key Takeaways

• Cleaning solar panels is crucial to maintain efficiency, as dirt and dust accumulation can hinder their ability to generate electricity, especially in windy regions.
• A proper solar panel cleaning checklist includes using gentle cleaning materials such as a soft brush, non-abrasive sponge, and mild soap and water solution to prevent damage to the glass surface.
• Cleaning solar panels should be done methodically, starting early in the morning, shutting down the system, and using the right cleaning techniques to ensure they remain in good working condition and generate maximum power.

Does Cleaning Your Solar Panels Make a Difference?

Cleaning solar panels is important to remove the layers of dirt and dust that accumulate on them for days.

The panels need cleaning as they’re exposed to heat, rain, dirt, wind, and other external factors. All this can severely affect your solar panels’ performance, especially if you reside in a windy region.

Why does this happen? When a thick layer of dust covers the solar panel’s surface, it can’t absorb sunlight properly and generate electricity. As a result, the panels won’t be able to power your house and appliances.

Regular maintenance can keep their efficiency in check for standard solar panels and won’t affect your electric bills. Even if you reside in an area prone to rain, it won’t wash away all grime.

Solar Panel Cleaning Checklist

Before gathering all the equipment to clean your solar panel, you must check with your panel installer about cleaning specs. It will give you an idea about the points to remember during the cleanup.

After you’re done, these materials will help you get those dirty panels clean –

• A soft brush
• An extendable pole to attach the brush
• A non-abrasive sponge along with soap and water solution
• A hose and a bucket
• Squeegee and a soft cloth for removing water from the panels

Optional utilities –

• A rake to remove snow from your panels
• A high-quality window washing kit

Be sure not to use harsh chemical products for cleaning solar panels as they might damage the glass surface. Again, check with the manufacturer for more details on this.

Steps to Clean Solar Panels

By now, you must be all set for solar panel cleaning! Start by checking the solar panel’s warranty and if cleaning/maintenance comes under it. And, if your solar system is leased, the provider might handle the cleaning for you. You’ll save lots of time and money in both cases.

If you must do it yourself, follow this step-by-step approach to clean your panels efficiently.

Step 1: Start Early in the Morning

When your panels need to be cleaned, the best way is to start early in the morning. It’s because the sun’s rays will be stronger later during the day and evaporate the water you’ll use for cleaning. It will smear the dirt and leave stains behind. Not a good sight!

Cleaning solar panels early in the morning will help remove the dirt quickly. It happens as the panels collect dew all night, which helps soften the dust particles.

You can also clean solar panels on a cool evening or an overcast day.

Step 2: Shut the System Down

The first step in your solar panel cleanup will be shutting it down completely. So, you might need to refer to the operating manual provided by the manufacturer. For example, you might have to use the main switch of your solar supply to shut down an AC system.

Shutting down the system will prevent electrical accidents and possible damage to the solar panels.

It would be best to disconnect the rainwater collections connected to the gutters. It will prevent dirty water from entering your tank while cleaning the panels.

Step 3: The Basic Cleanup

To be safer, begin cleaning your panels from the ground. Wash the panels with a hose with an appropriate nozzle and a bucket of soap water.

Ensure the water isn’t of high mineral content. Also, try not to use high water pressure while spraying. Both these steps will protect the panel’s surface.

Step 4: Remove the Dirt and Grime

If you see that the layer of dirt and grime is too thick to wash off, you’ll need extra power. Firstly, attach the brush to the extension pole and start scrubbing the panel gently. It will prevent scratches on the glass surface while removing stubborn dirt or bird droppings.

You can also use a sponge dipped in soap and a soft brush. Just fix it to the extension pole. However, never use harsh detergents to clean the panel’s glass surface. Always pick a non-abrasive cleaner.

Before each wipe, let the soapy water stand on the glass for 5 to 10 minutes.

Step 5: Dry the Panels

After removing all of the dust and dirt from the solar panels, it’s time to rinse off the water. It would be best to use a soft squeegee with a plastic blade on the side to dry the wet panels. Avoid using high-pressure water here to keep the panels in shape.

You can use a soft and dry cloth to remove water from the edges of the solar panels. Move it across the edges after you’re done using the squeegee.

Step 6: Clear Out Other Materials

Besides the dust and grime, other stuff might be stuck on your panels. So, when you clean solar panels, the snow, mud, or debris must also go away.

If there’s too much snow on the solar panels, you can use a rake attached to the extension pole to remove all of it. In addition, you can use a hot air blower on the surface to get rid of the snow.

For clearing other stuff, keep these pointers in mind –

• If branches or twigs are stuck on the panels, you might have to climb up for a good look.
• You must only attempt to get on the rooftop if you have a safety ladder or proper equipment.
• Remember that the wet panels might be super slippery, so be cautious. The best way to go about this is by contacting professional cleaning services.

Frequently Asked Questions

How Often Should We Clean Our Solar Panels?

You must clean your panels every 4 to 6 months. If you live in a dry and dusty area with lots of pollution, you must clean them every 3-4 months.

People living near construction sites or areas with frequent rainfall must follow this maintenance schedule. As a rule of thumb, take a closer look at your solar panels every month.

What is the Best Cleaner To Use On Solar Panels?

The best solar panel cleaning substance combines water and mild soap. Gently spray this solution on the panels using a hose, keeping the pressure low. Don’t use strong chemicals or detergents for cleaning.

After attaching them to an extendable pole, you can use a soft brush or sponges to clean sticky dust particles.

Case Study: Optimising Solar Panel Efficiency Through Regular Cleaning

Background

A residential property in the South East of England, equipped with a 5kW solar PV system, experienced a noticeable drop in energy output. The homeowner observed that the panels were not generating as much electricity as initially expected, despite clear, sunny days. Suspecting that accumulated dirt might be the issue, they contacted us for a comprehensive assessment and cleaning service.

Project Overview

Our task was to evaluate the extent of dirt and debris accumulation on the solar panels and implement a cleaning strategy to restore their efficiency. The primary objective was to improve the system’s performance and extend the panels’ lifespan by maintaining a clean surface.

Implementation

• Initial Assessment: We conducted an inspection to assess the amount of dirt, dust, and debris on the panels. The panels were found to be covered with a significant layer of dust and bird droppings, which likely reduced their efficiency.
• Preparation: Before cleaning, we ensured that the solar PV system was completely shut down to prevent any electrical hazards. We also reviewed the manufacturer’s guidelines to confirm the recommended cleaning methods and avoid any potential warranty issues.
• Cleaning Process:
  • Early Morning Start: We began the cleaning early in the morning when the panels were cooler, minimising the risk of thermal shock to the glass.
  • Mild Soap Solution: A mild soap solution was prepared, and a non-abrasive sponge was used to gently scrub the surface of the panels, removing dirt and grime.
  • Rinse and Dry: After scrubbing, we rinsed the panels with demineralised water to prevent mineral deposits from forming. A soft squeegee was then used to remove excess water and prevent streaking.
• Post-Cleaning Inspection: We inspected the panels post-cleaning to ensure all debris was removed and the surface was clear. The inverter and monitoring systems were also checked to confirm that the panels were functioning correctly.

Results

• Improved Efficiency: Post-cleaning, the homeowner reported a significant improvement in energy output, with the system generating approximately 20% more electricity compared to pre-cleaning levels. This increase confirmed the positive impact of regular maintenance on solar panel performance.
• Cost Savings: By restoring the panels to their optimal efficiency, the homeowner could maximise their investment in solar energy, leading to greater savings on electricity bills.
• Increased Lifespan: Regular cleaning helps prevent long-term damage caused by the buildup of dirt and debris. This maintenance not only enhances efficiency but also prolongs the lifespan of the solar panels, providing sustained value over time.
• Safety and Professionalism: The professional cleaning service ensured that the panels were cleaned safely and effectively, without any risk to the homeowner or damage to the equipment.

Summary

This case study highlights the importance of regular cleaning and maintenance for solar panels. By removing dirt and debris, homeowners can significantly improve the efficiency and lifespan of their solar systems. At Solar Panels Network, we provide expert cleaning and maintenance services to ensure that your solar investment continues to perform at its best. This project demonstrates our commitment to maintaining high standards of service and supporting our clients in achieving their renewable energy goals.

Expert Insights From Our Solar Panel Installers About Solar Panel Cleaning

Regular cleaning of solar panels is crucial for maintaining their efficiency. Even a thin layer of dust or debris can significantly reduce energy output. We recommend cleaning the panels every few months, especially in areas with high pollution or near construction sites, to ensure optimal performance.

Senior Solar Installer

Using the right tools and cleaning agents is essential to avoid damaging the panels. A soft brush, non-abrasive sponge, and mild soap solution are ideal. Harsh chemicals and high-pressure washers can damage the glass surface, reducing the panel’s lifespan and efficiency.

Renewable Energy Consultant

For those who are not comfortable working on rooftops, hiring a professional service is advisable. Safety is paramount, and professionals have the right equipment and expertise to clean the panels without causing damage or risking personal injury.

Lead Solar Technician

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Wrapping Up

To keep your solar panels running for years, you must clean and maintain them frequently. If you can’t do it alone, get some help, but keep those panels clean. In addition, don’t use equipment that might damage the surface while cleaning.

Monitoring your solar panels every month or two will help you maintain them properly. Always check whether the panels’ inverter is flashing green lights, which means everything is in order.