Unlocking the full potential of solar energy: A guide to maximizing the lifespan of your solar panels
The Solar Revolution in Australia
Australia is witnessing a quiet revolution in renewable energy. The country's Energy Market Operator hailed the last three months of 2025 as a "landmark moment" with renewable energy's share rising above 50% for the first time, surpassing coal's dominance. This shift is largely driven by the widespread adoption of household solar panels, with approximately 4.3 million homes (around one in three) boasting rooftop solar installations, totaling over 28 GW of capacity.
However, as more households embrace this clean energy source, a recent study by the University of New South Wales (UNSW) has revealed a concerning trend: solar panels are failing faster than anticipated. This raises crucial questions for homeowners and businesses: What should you look for when purchasing solar panels, and how can you ensure their longevity in increasingly volatile weather conditions?
The Degradation Dilemma
Similar to most manufactured products, solar panels naturally degrade over time. However, the UNSW team's analysis of 11,000 photovoltaic samples revealed a startling finding: around one in five panels performed 1.5 times worse than expected, implying a lifespan of just 12 years instead of the anticipated 25 years.
Key factors contributing to this accelerated degradation include internal failures due to panel elements interacting with each other, poor quality control leading to manufacturing defects, and other flaws resulting in performance loss over time. As Yang Tang, one of the research authors, noted, "For the entire dataset, we observed that system performance typically declines by around 0.9% per year. However, our findings show extreme degradation rates in some of the systems. This means that for some systems, they could lose about 45% of their output by the 25-year mark."
Maximizing Lifespan: Simple Maintenance Strategies
While individual experiences with solar panels may vary, simple home maintenance strategies can significantly extend their lifespan. Tim Forcey, author of My Efficient Electric Home Handbook, installed solar panels in his Melbourne bayside home in 2008 and, despite treating them as a "science experiment," they are still functioning. He added 22 more panels in 2017, now powering his entire home.
Forcey attributes their longevity to basic maintenance practices. He advises installing panels at an angle to prevent water and mud accumulation, and regularly cleaning them with a brush on a long stick to remove moss and lichen. "I keep them clean with a brush on a long stick, especially taking care to get rid of any moss and lichen that accumulates."
Setting Up for Success: Installation Best Practices
Brendan Lang, an electrician and founder of Get Off Gas, emphasizes three crucial steps to minimize the risk of underperforming solar panels: using quality products from the start, engaging expert local installers, and regular maintenance.
"You wouldn't expect your motor vehicle to be running perfectly after 25 years without servicing – the same goes for renewable energy," Lang says. He recommends having a qualified expert guide you through the installation process and return for servicing every two to three years. "Systems come in various qualities, and therefore serviceability and longevity. Good maintenance is vital for safety as well as efficiency and longevity. Keeping your panels clean, cabling and connections in check, and ensuring the racking affixing the panels to your roof is fastened are all equally important."
Regular servicing also allows you to monitor your panels' performance. If performance drops significantly, you can make a warranty claim (usually 25 years for quality panels).
When Things Go Wrong: Repair or Recycle?
While all solar panels have a limited lifespan, deciding whether to repair or replace them involves considering several factors.
If only one panel fails, finding a suitable replacement is possible, provided it has a very similar physical size and specifications. However, if the issue is with the inverter, secondhand inverters are readily available, and a skilled installer can replace them.
"A good original installer will install one type of panel and likely keep spares or be able to get them from the manufacturer," advises Finn Peacock of Solar Quotes. "As a last resort, you may be able to just remove the panel or bypass it electrically – depending on the string configuration. You'll lose one panel worth of energy (about 2kWh per day) but keep the rest of the system going for minimal cost."
If your system is more than six years old, replacing the entire array with more efficient panels can significantly boost energy production, and you may be eligible for the solar panel rebate again.
However, ensuring proper recycling is crucial when replacing panels. "Don't assume the people removing them will recycle them – because it costs $30 per panel to do it, they unfortunately often end up elsewhere," Peacock warns. "You need to insist on it and ask for the receipt."
Peacock emphasizes that simple practices like avoiding permanent shade, regular servicing, and preventing leaf buildup underneath the panels can significantly enhance their longevity.
