How to clean photovoltaic panels: a practical guide to maintaining the efficiency of your system
Solar panels are designed to last decades, but without proper maintenance and cleaning they risk losing a significant part of their efficiency.
Knowing how to clean photovoltaic panels is essential to prevent dust, pollen, excrement and leaves from accumulating on the surface of the modules and reducing the system’s ability to produce energy. It must be said, however, that cleaning a photovoltaic system is not an operation to be improvised: it requires caution, adequate tools and, above all, the support of professionals for the more complex and potentially dangerous operations.
Let’s see how and when to clean photovoltaic panels, which methods to absolutely avoid and why it is always advisable to rely on professionals for cleaning solar panels.
Why is it important to clean photovoltaic panels?
Washing photovoltaic panels is a functional need, which serves to make your system more efficient. In fact, photovoltaic modules must be directly exposed to solar radiation to function correctly. When dust, smog, pollen, dry leaves or bird droppings accumulate on their surface, light radiation is partially blocked and this can also significantly reduce energy production. Consider that, according to research published in the Journal of Sustainable Development of Energy, Water and Environment Systems (JSDEWES), the accumulation of dust on photovoltaic panels can cause an average energy loss of 9.5% up to 45.6%.
For this reason, washing solar panels helps you avoid production drops, extend the useful life of the system and maximize the economic return on investment.
How often should photovoltaic panels be cleaned?
In general, cleaning of photovoltaic modules should be done at least once a year, but in some particular situations it may be necessary even more frequently.
For example, if the system is located in an agricultural area, near busy roads or industrial areas, the accumulation of dust, smog or organic residues may be faster and therefore require more frequent cleaning. The same applies to systems near the sea, where salt and humidity can deposit more easily.
Remember that some manufacturers require regular cleaning of photovoltaic modules to keep warranties valid. Ignoring this aspect could result in the loss of warranty coverage.
Washing the photovoltaic system: how to do it?
Cleaning photovoltaic panels may seem simple, but in reality it is an activity that requires attention and, above all, safety. There are mainly two ways to manage maintenance and cleaning of photovoltaic systems:
- Contact an expert company specialized in the assembly, maintenance and cleaning of panels. This is the safest choice and the best results, because these operators have specific tools and knowledge to wash the system without damaging it;
- Opt for a less thorough DIY cleaning, where the installation conditions naturally allow safe access to the system. This method may be cheaper, but the modules are often positioned on roofs and intervening independently can be dangerous, especially without the right equipment and skills.
The best solution, therefore, is to turn to qualified professionals, who can also carry out a visual inspection of the system, useful for detecting any anomalies or damage.
Photovoltaic panel cleaning kit
If you are thinking of carrying out small maintenance operations on your photovoltaic system on your own, there are several solar panel cleaning kits, designed to remove dirt and debris without damaging the delicate surfaces of the modules.
A good kit should have inside:
- A brush for cleaning photovoltaic panels with soft or rotating bristles, mounted on telescopic rods to easily reach surfaces even at heights;
- Demineralised water, which prevents the formation of halos or limescale after washing;
- Microfibre cloths for delicate drying and finishing;
- Fittings and accessories for connection to taps or pumps, to power the washing systems.
How to professionally clean photovoltaic panels
Professional cleaning of photovoltaic panels is managed by specialized operators such as Southenergy, who use latest-generation techniques and equipment, designed to ensure effective cleaning without compromising the integrity of the modules. The process often begins with a preliminary assessment of the system to immediately identify any particularly dirty areas.
Demineralized water is usually used, which prevents the formation of halos or limescale residues, together with soft bristle brushes or rotating systems, mounted on telescopic rods that allow you to comfortably reach even the panels installed at high altitudes.
In addition, where appropriate, controlled pressure washing systems are used, which allow you to effectively remove dirt without using aggressive detergents.
If you are looking for a reliable partner for the maintenance and professional cleaning of photovoltaic panels, Southenergy is at your side. Since 2008 we have been helping companies and individuals to obtain the maximum performance from their systems thanks to customized services, qualified personnel and cutting-edge equipment. Contact us for an free consultation.
FAQ How to clean photovoltaic panels
Why is it important to clean photovoltaic panels?
Cleaning photovoltaic panels is essential to maintain the system’s high efficiency. Dust, smog, sand or leaves can reduce the ability to absorb sunlight, lowering energy production by 20% or more.
How often should photovoltaic panels be cleaned?
The ideal frequency depends on the location of the system. In urban or dusty areas, cleaning every 6 months is recommended. In areas less exposed to dirt and dust, annual cleaning may be sufficient. It is useful to monitor production to identify any drops due to dirt.
How to clean photovoltaic panels?
It is recommended to use demineralized or soft water, soft brushes or microfiber cloths. Cleaning should preferably be done early in the morning or at sunset, when the panels are cold, avoiding aggressive detergents and high-pressure jets.
Is it better to clean the panels yourself or call a professional?
Do-it-yourself cleaning is to be considered a partial intervention, and only and exclusively where the installation site allows absolutely safe access to the system. To preserve personal safety and also the correct functioning of the system, it is advisable to rely on qualified operators for the maintenance of the system, including cleaning.
What mistakes should be avoided when cleaning panels?
Do not use pressure washers, chemical detergents or abrasive tools. Avoid cleaning during the hottest hours to avoid thermal shock and do not walk on the panels.