In our latest blog, O&M Engineer at AR Power, Phil Armstrong, answers a common question we’re asked, ‘Do commercial solar panels actually need to be maintained?’
As more UK businesses turn to renewable energy, commercial solar has moved from a “nice to have” to a strategic investment.
From warehouses and schools to farms and office buildings, rooftop systems are helping organisations cut energy costs and reduce carbon emissions, in our latest blog, O&M Engineer at AR Power, Phil Armstrong, answers a common question we’re asked, ‘Do commercial solar panels actually need to be maintained?’
The short answer to the question is yes. If you want to protect your investment and maximise performance, maintenance is essential.
Solar panels are often described as low maintenance and that’s true to an extent. Commercial systems have no moving parts and they’re designed to withstand British weather, from heavy rain and frost to the occasional summer heatwave, however, “low maintenance” does not mean “no maintenance”.
Over time, dirt, bird droppings, moss, lichen and airborne pollutants can build up on the surface of panels, in the UK, agricultural dust, traffic pollution and tree debris are particularly common causes of soiling. Even in rainy regions, panels don’t always clean themselves effectively especially if they’re installed at a shallow angle. This buildup reduces the amount of sunlight reaching the photovoltaic cells, directly affecting energy generation.
You might be surprised to know how much the dirt impacts the performance of the solar panels. Studies have shown that dirty panels can lose anywhere from 5% to 25% of their output depending on location and environmental conditions. For a commercial system producing thousands of pounds’ worth of electricity each year, that drop in performance can quickly become costly.
For example, if your system was installed by a reputable provider such as AR Power and designed to deliver significant annual savings, reduced efficiency means longer payback times and lower returns on investment. Put simply, if your panels aren’t producing at their optimum level, you’re leaving money on the table.
While cleaning is important, proper commercial solar maintenance goes beyond simply washing the panels. A comprehensive maintenance service should include:
☑️ Visual inspections of panels for cracks or damage
☑️ Checking mounting systems and roof fixings
☑️ Testing inverters and electrical components
☑️ Monitoring system performance data
☑️ Identifying underperforming strings or panels
☑️ Ensuring cabling and connections remain secure
In the UK climate, temperature fluctuations and high winds can gradually loosen fixings or cause minor wear, left unchecked, small issues can develop into larger and more expensive problems. Regular maintenance helps identify faults early, preventing downtime and costly repairs.
We’re also often asked about warranties and compliance and the link to maintenance. Most commercial solar panels come with long performance warranties, often 20 to 25 years, however, many manufacturers require systems to be properly maintained in order for warranties to remain valid, neglecting maintenance could jeopardise warranty claims if faults arise.
For certain sectors, including schools, healthcare facilities and public buildings, maintaining solar systems can also form part of broader compliance and safety responsibilities. Regular inspections ensure your system continues to meet electrical safety standards and operates safely on your premises.
When it comes to how often commercial solar panels should be maintained, there’s no one-size-fits-all answer. Frequency depends on several factors:
☑️ Location (urban, rural, coastal, agricultural)
☑️ Roof angle and system design
☑️ Nearby trees or sources of dust
☑️ Local weather patterns
In many cases, an annual inspection and clean is sufficient, however, sites near farms, industrial estates or busy roads may benefit from more frequent cleaning to maintain peak performance, the key is monitoring.
Modern commercial systems often include remote monitoring software that highlights drops in output. A professional maintenance provider such as AR Power can analyse this data and recommend the appropriate service schedule.
Wondering if commercial solar maintenance is worth the cost? The investment is modest compared to the original installation investment. When weighed against the potential loss in energy production, it is typically highly cost-effective. Consider it the same way you would maintain a boiler or HVAC system, you wouldn’t install critical infrastructure and then ignore it for 20 years. Your solar system is a long-term asset therefore protecting it ensures predictable savings, consistent carbon reductions and uninterrupted operation.
Some business owners assume that the UK’s frequent rainfall keeps panels clean. While rain does help, it’s rarely enough on its own. Rainwater often spreads dirt rather than fully removing it, particularly if panels are flat or only slightly angled. In addition, pollen in spring, leaf debris in autumn and bird activity throughout the year all contribute to residue that rain cannot completely clear.
Professional cleaning uses purified water systems and specialist equipment that remove grime safely without damaging panel surfaces or roof structures.
Ensure you protect your investment with professional maintenance, commercial solar is a long-term financial and environmental commitment. To ensure your system continues performing as designed, regular professional maintenance is essential.
At AR Power, we don’t just install high-quality commercial solar systems, we maintain them too. Our experienced team provides thorough inspections, safe specialist cleaning and detailed performance checks to keep your system operating at its full potential.
If you’re unsure whether your panels are performing as they should or if it’s been over a year since your last inspection, now is the time to act.
Get in touch with AR Power today to arrange a professional commercial solar maintenance assessment and ensure your system continues delivering maximum returns for years to come because when it comes to renewable energy, installation is only the beginning, smart maintenance is what keeps the savings shining.
