Solar panels are designed to operate outdoors in different weather conditions, and rainfall will naturally wash away some of the dust and dirt that collects on their surface. However, over time, bird droppings, pollen, leaves and other debris can build up, and this can have a negative impact on how much sunlight reaches your panels. As a result, knowing how to wash solar panels properly can help you keep your system in good condition and maintain its performance. But what do you need to know about washing solar panels?
Do solar panels need washing?
Solar panels generally require relatively little maintenance, and rain will often remove loose dirt from panels installed at a suitable angle. However, rainfall may not remove more stubborn deposits, such as bird droppings, tree sap or accumulated grime. As such, you may want to check your panels occasionally for visible dirt or debris, particularly if your property is near trees, farmland or busy roads.
Any cleaning you do should be based on the condition of your panels rather than following a rigid schedule. If your panels look clean and are generating electricity as expected, there may be no need to wash them.
What do you need to wash solar panels?
If your panels can be reached safely from the ground, you may be able to clean them using a few basic items. These can include:
- A garden hose with a gentle water flow
- A soft brush or sponge suitable for solar panels
- A telescopic cleaning pole, if needed to reach the panels safely
- Clean water, following your panel manufacturer’s recommendations
It is important that you avoid using abrasive brushes, rough sponges or equipment that could scratch the glass. You should also check your manufacturer’s guidance before using any cleaning products, as unsuitable chemicals may damage the panel surface or leave residue.
How to wash solar panels safely
If your panels are safely accessible without climbing onto the roof, the following steps can help you clean them carefully.
1. Check the Panels Before Cleaning: Look for visible dirt, leaves, bird droppings or other debris that may be obstructing the surface. Check for any signs of damage, such as cracked glass or exposed wiring. If you notice damaged panels or cables, do not attempt to clean or repair them yourself. Contact a qualified solar professional.
2. Choose a Suitable Time: It is best to clean solar panels when their surfaces are cool, such as during a cooler part of the day or in overcast weather. Avoid washing hot panels with cold water, as sudden temperature changes can place stress on the glass. Cooler conditions can also help prevent water from evaporating too quickly and leaving marks.
3. Rinse Away Loose Dirt: Use a gentle flow of water to remove loose dust and debris. Avoid directing water forcefully at the panels, seals or electrical components. For panels that are safely within reach, a soft brush or sponge may help loosen more persistent dirt.
4. Clean Gently and Rinse: If dirt remains, use a soft cleaning tool and follow the manufacturer’s instructions. Avoid scraping deposits with sharp objects or applying excessive pressure. Rinse away loosened dirt carefully and allow the panels to dry naturally, unless your manufacturer’s guidance recommends otherwise.
5. Check the Results: Once the panels are clean, check that there is no obvious debris remaining. You can also monitor your system’s electricity generation over time to see whether its performance appears normal. Keep in mind that changes in sunlight, weather and seasonal conditions can also affect generation, so cleaning will not necessarily produce an immediate or noticeable improvement.
What should you avoid when washing solar panels?
Using unsuitable cleaning methods can damage your panels or create unnecessary safety risks. As such, you should avoid the following:
- Pressure washers: High-pressure water can damage seals or other components, so use a gentle rinse instead.
- Harsh chemicals: Cleaning products may leave residue or damage the panel surface.
- Abrasive equipment: Wire brushes, scouring pads and sharp tools can scratch the glass.
- Walking on panels: Solar panels are not designed to support a person’s weight, and walking on them can cause damage.
- Climbing onto the roof: Roof work carries a serious risk of falling, particularly when surfaces are wet.
How often should you wash solar panels?
It’s important to be aware that many domestic systems do not need regular cleaning, because rainfall removes much of the surface dirt. However, panels exposed to heavy dust, frequent bird droppings or other stubborn deposits may need more attention.
Regular visual checks and performance monitoring can help you decide when cleaning is necessary.
For more information or advice, why not contact the experts today, here at the Eco Renewables Group? We work across the UK, from Oxford to Derby, to deliver high quality solar power solutions.
