How to clean solar panels - the definitive guide

Owning a solar panel system is a fantastic way to harness renewable energy, but it's important to remember that proper maintenance is key to keeping it running efficiently. While solar panels are designed to be low-maintenance, they still require periodic cleaning to ensure optimal performance. You might think that once your solar panels are installed, you can just sit back and let them do their job, but there will come a time when you'll need to know how to clean them properly.

Think of your solar panels as you would your car or the windows in your home—they need a bit of TLC every now and then. Exposure to the elements means that dust, pollen, bird droppings, and even leaves can accumulate on your panels, reducing their efficiency. While rainfall can help keep your panels relatively clean, it’s not always enough, especially if you live in an area with low precipitation levels or high levels of air pollution.

The angle of your panels and the cleanliness of your surroundings play a significant role in how dirty your panels can get. Regular cleaning ensures that your panels operate at peak efficiency, which translates to lower energy costs and a better return on your investment.

In this guide, we’ll walk you through everything you need to know about cleaning your solar panels—when, where, and how to do it, along with some tips to make the process smoother.

What Tools Do You Need to Clean Solar Panels?

 

Chances are, you already have most of what you need to clean your solar panels right at home. Think of it as similar to washing a car—soft brushes are ideal to avoid scratching the surface. For tougher grime, a squeegee with a soft sponge side is recommended, but avoid using abrasive materials that could cause damage.

A high-pressure water hose might seem tempting, but it can actually harm your panels, so opt for a standard garden hose or a watering can instead. Alternatively, a bucket of warm water and a soft sponge will work just fine. When it comes to cleaning solutions, it’s generally best to stick to plain water. Soaps and detergents can leave a residue that reduces the efficiency of your panels, so they're best avoided unless absolutely necessary.

Safety First

 

Before you start cleaning your panels, take a moment to assess the situation. Determine whether you can access your panels from the ground or if you’ll need a ladder. If your panels are located in a hard-to-reach area or are particularly dirty, it might be safer to call in a professional. In most cases, however, you can handle the cleaning yourself.

It’s also a good idea to turn off your solar system before starting. This helps prevent any potential electrical hazards and protects your equipment from damage caused by water entering a live system.

How to Clean Your Solar Panels

 

Solar panels are best cleaned early in the morning on an overcast day or later in the evening when the sun isn't directly heating the panels. Cleaning them during the heat of the day can cause water to evaporate quickly, leaving streaks and potentially damaging the surface.

Start by gently brushing away loose debris with a soft-bristled brush. This will help prevent scratches and make the cleaning process easier. Next, use a hose or bucket of warm water to rinse the panels thoroughly. If you encounter stubborn dirt, a soft sponge or squeegee can help remove it without causing harm.

For areas prone to bird droppings, which can significantly reduce panel efficiency, you may need to scrub harder. Avoid using harsh chemicals, as they can degrade the protective coating on your panels.

Bird Droppings: A Common Problem

 

Bird droppings are one of the biggest nuisances for solar panel owners. These deposits can block sunlight from reaching the photovoltaic cells, drastically reducing energy output. Unlike dust, which can be washed away by rain, bird droppings typically require manual removal.

If you live near trees or other areas frequented by birds, you may want to consider installing deterrents to keep them away. There are various options available, from spikes to reflective surfaces, that can help minimize bird activity around your panels.

Is It Worth the Effort?

 

Absolutely! Taking the time to clean your solar panels regularly can lead to noticeable improvements in performance. Not only will your system produce more energy, but you’ll also extend its lifespan. Whether you choose to tackle the task yourself or hire professionals, the benefits far outweigh the effort.

If you're interested in exploring solar power further or need assistance with your existing setup, feel free to reach out to our team. We’re here to help you make the most of your solar investment.