How To Clean Solar Panels on a Residential Roof

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Solar panels are becoming increasingly popular as a source of renewable energy today.

And these dirty and dusty panels can significantly reduce their efficiency.

In fact, according to a study by the National Renewable Energy Laboratory (NREL), dirty solar panels can lose up to 25% of their energy output. Making it is crucial for solar panels to be cleaned regularly in order to maximize their energy generation and save money on electricity bills.

The cleaning process for solar panels on a roof typically involves the use of water and a soft-bristled brush to remove any dirt or debris that may have accumulated on the surface of the panels. In some cases, a mild detergent may be used to help loosen any stubborn dirt or grime. It is important to avoid using abrasive materials or harsh chemicals, as these can damage the panels.

In this article, we will discuss the best practices for cleaning solar panels on your roof.

Pre-Cleaning Preparations on a Residential Roof

When it comes to cleaning solar panels installed at a height, safety should always be the top priority. Before starting any work, make sure that you have all the necessary safety equipment.

Here are some safety precautions to keep in mind:

  • Always wear appropriate personal protective equipment (PPE) for the task at hand, such as gloves, safety glasses, or hard hats.
  • Follow all safety guidelines and rules for the equipment or machinery you are using.
  • Keep your work area clean and free of clutter to avoid tripping hazards.
  • Be aware of your surroundings and any potential hazards, such as sharp objects or slippery floors.
  • Never work under the influence of drugs or alcohol.
  • Take breaks as needed to avoid fatigue and maintain focus.
  • Check manufacturer’s instructions

Remember to prioritize your safety at all times when cleaning solar panels on the roof.

Cleaning Process

Cleaning solar panels is an important process that ensures optimal efficiency and longevity of the panels.

Some of the materials need to clean a solar panel are:

  • Soft-bristled brush or sponge
  • Bucket of warm water
  • Non-abrasive soap or detergent
  • Squeegee or soft cloth for drying
  • Safety equipment (if needed for accessing the solar panel)

Here are some of the best practices for an effective solar panel cleaning process:

  1. Safety first: Before starting the cleaning process, ensure that you have the appropriate safety gear and equipment.
  2. Turn off the panels: Shut off the power supply to the solar panels to avoid electric shocks.
  3. Brush off debris: Use a soft-bristled brush or a broom to remove any debris or loose dirt from the panels. Avoid using abrasive materials that can scratch the panels.
  4. Rinse with water: Use a hose or a pressure washer with a low-pressure setting to rinse the panels with water. This helps to remove any remaining dirt or debris.
  5. Use a cleaning solution: For stubborn dirt or stains, mix a cleaning solution of water and mild soap or detergent. Apply the solution to the panels using a soft cloth or sponge.
  6. Rinse again: Rinse the panels thoroughly with water to remove any soap residue.
  7. Dry the panels: Use a squeegee or a soft, dry cloth to remove any remaining water from the panels.
  8. Inspect the panels: Once the cleaning process is complete, inspect the panels for any signs of damage or wear. If you notice any cracks or other damage, contact a professional for repairs.

Remember to clean your panels regularly to maintain their efficiency and longevity.

How Often Should Solar Panels be Cleaned?

The frequency of cleaning solar panels depends on various factors such as location, weather conditions, and the amount of dust and debris in the area.

Some US states with dryer conditions:

  1. Arizona
  2. California
  3. Nevada
  4. New Mexico
  5. Texas
  6. Utah
  7. Wyoming

In general, it is recommended to clean solar panels at least twice a year, preferably in the spring and fall.

But if the panels are located in a dusty area (some areas with dusty terrain) or near trees, they may need more frequent cleaning.

On some occasions, the accumulation of dust, bird droppings, and other debris can significantly reduce their energy output. This is particularly important for some locations, such as solar panels Washington state where the weather can be unpredictable and a bit challenging.

Regular cleaning of solar panels can increase their efficiency and lifespan, resulting in more significant savings on energy costs.

How to Monitor the Performance of Solar Panels

There are several ways to monitor the performance of solar panels.

One method is to use a monitoring system that tracks the energy output of the panels. This can be done through a software program that provides real-time data on the amount of energy being generated.

Some popular options include:

  • SolarEdge
  • Enphase Enlighten
  • SunPower Monitoring

Before choosing an app, make sure it is compatible with your solar panel system and that it meets your specific monitoring needs.

These apps allow you to track your solar energy production and monitor the health of your system in real time. They also provide insights into your energy usage and savings.

Another option is to physically inspect the panels on a regular basis to ensure that they are clean and free of damage. This can help identify any issues that may be impacting the performance of the panels.


Regular cleaning of solar panels is important to maintain their efficiency and functionality. Dust, dirt, and debris can accumulate on the surface of the panel, reducing the amount of sunlight that can be absorbed. This can ultimately lead to a decrease in the amount of electricity generated by the panel.

Proper cleaning methods and equipment should be used to avoid any damage to the panel.

Always follow the manufacturer’s instructions as well as safety protocols for cleaning and maintenance to ensure your safety and the efficiency of solar panels at 

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