Chapter 6

Introduction

We've now completed the scientific foundations Once a solar power system has been commissioned, it is designed to operate with very little day-to-day attention.

Unlike many other forms of power generation, there are no moving mechanical parts within the solar panels themselves. The system starts automatically each morning, follows the movement of the Sun throughout the day and shuts down again each evening.

This simplicity is one of solar energy's greatest strengths. However, low maintenance does not mean no maintenance.

Over many years of operation, environmental conditions gradually affect the installation. Dirt accumulates, vegetation grows, weather slowly ages components and electrical equipment experiences continual heating and cooling cycles.

Routine inspections help identify these changes before they begin affecting performance or reliability.

Maintaining a solar installation is therefore less about repairing faults and more about ensuring the system continues operating exactly as it was designed.

Routine Visual Inspections

Most maintenance begins with careful observation. A routine visual inspection allows many potential problems to be identified without specialised equipment. Panels are checked for cracks, damaged glass, discolouration or signs of water ingress. Mounting systems are inspected for loose components, corrosion or movement, while exposed cables are examined for signs of damage, abrasion or ultraviolet deterioration.

The surrounding area is also assessed for anything that may have changed since the system was originally installed. Small problems discovered early are usually straightforward to correct. If left unnoticed for years, they can develop into more significant faults.

Keeping the Panels Clean

Solar panels rely on sunlight reaching the solar cells beneath the protective glass. Anything that blocks this light can reduce electricity generation. Dust, pollen and airborne pollution gradually settle on the surface of the panels, while bird droppings can create localised areas of heavy soiling.

Fortunately, rainfall naturally removes much of this contamination in many climates. As a result, regular cleaning is often unnecessary. Cleaning is generally only recommended when a noticeable build-up of dirt is reducing performance or where environmental conditions, such as nearby industry, heavy traffic or prolonged dry weather cause excessive soiling.

When cleaning is required, soft brushes or low-pressure water are typically sufficient. Abrasive materials, harsh chemicals and pressure washers should be avoided, as they may damage the glass or protective coatings.

Looking Beyond the Panels

The panels themselves are only one part of the installation. Leaves may accumulate beneath the array, reducing ventilation or obstructing drainage. Birds occasionally build nests beneath rooftop systems, while new vegetation can gradually introduce shading that did not exist when the system was first designed.

These environmental changes may develop slowly over many years and are often only discovered during routine inspections.

Maintaining the area around the solar installation is therefore just as important as maintaining the equipment itself. The surrounding environment should continue supporting the original design rather than gradually reducing its performance.

Inspecting the Electrical Equipment

Maintenance extends well beyond the rooftop. The inverter, switchboard, batteries and associated electrical equipment should also be inspected periodically. 

Ventilation openings around the inverter should remain unobstructed so heat can be removed effectively during operation. Battery systems should be checked for signs of physical damage, moisture ingress or blocked airflow, while cable entries, conduit supports and warning labels should remain secure and clearly visible.

Although these components require very little routine intervention, maintaining good operating conditions helps maximise both reliability and service life.

Maintaining the Structural System

The mounting system that supports the solar array is expected to withstand decades of changing weather. Over time, exposure to wind, rain, ultraviolet radiation and temperature changes places continual stress on both the roof and the mounting hardware.

Routine inspections confirm that mounting brackets remain secure, panel clamps have not loosened and there are no signs of corrosion or movement. Cable clips and supports are also checked to ensure wiring remains protected and does not come into contact with sharp edges or roof surfaces. Although structural problems are uncommon, periodic inspections help ensure the installation continues performing safely throughout its lifetime.

Preventative Maintenance

The most effective maintenance is often the maintenance that prevents faults from occurring in the first place.

Rather than waiting for equipment to fail, preventative maintenance identifies small issues before they develop into larger problems.

Performance monitoring, routine inspections and good record keeping work together to build a complete history of the installation. Comparing inspection reports over time allows engineers to identify gradual changes that may otherwise go unnoticed.

These records also provide valuable information if warranty claims, future upgrades or fault investigations become necessary.

Preventative maintenance therefore protects not only the equipment itself, but also the long-term value of the investment.

Looking Ahead

Even with careful maintenance, no solar power system remains completely unchanged throughout its lifetime. Every year, the panels experience thousands of heating and cooling cycles. Ultraviolet radiation slowly ages materials. Electrical components gradually wear.

These changes are usually small, almost impossible to notice from one year to the next. Over decades, however, they become measurable.

In the next chapter, we'll explore how solar power systems age over time, examining performance degradation, component lifetimes and why many systems continue producing electricity long after their original warranty has expired.