Maximizing the Lifespan of Solar Panels: Maintenance and Repair Tips
The sun's power is being harnessed across Australia, marking a significant shift towards renewable energy. The Energy Market Operator hailed the last quarter of 2025 as a turning point, with renewable energy surpassing 50% of the grid's reliance for the first time (https://www.theguardian.com/environment/2026/jan/31/australias-grid-now-relies-on-renewable-energy-as-much-as-coal-those-who-doubted-it-look-foolish). This achievement is largely attributed to the widespread adoption of household solar panels, with approximately 4.3 million homes (around one-third of the total) boasting rooftop solar installations, totaling over 28 GW in capacity.
However, as the demand for renewable energy grows, a recent study by the University of New South Wales (UNSW) reveals a concerning trend: solar panels are failing faster than anticipated (https://www.unsw.edu.au/newsroom/news/2026/01/research-targets-long-tail-solar-panel-issue). This raises important considerations for homeowners and businesses when investing in solar power, especially in the face of increasingly volatile and extreme weather conditions.
Understanding Solar Panel Degradation
Similar to other manufactured products, solar panels naturally degrade over time. However, the UNSW team's analysis of 11,000 photovoltaic samples revealed a startling finding: approximately 20% of these panels performed 1.5 times worse than expected.
This translates to a shorter lifespan than the anticipated 25 years. Instead, these panels may start failing as early as 12 years. The study identified several key issues contributing to this accelerated degradation:
- Internal Failures: Interactions between panel elements can lead to internal malfunctions.
- Poor Quality Control: Manufacturing defects resulting from subpar quality control.
- Performance Loss: Other flaws cause a gradual decline in overall performance over time.
Yang Tang, a research author, emphasized the severity of the situation: "System performance typically declines by around 0.9% per year, but our findings highlight extreme degradation rates in some systems. This means that for some systems, they could lose about 45% of their output by the 25-year mark."
Maximizing Solar Panel Lifespan
While individual experiences with solar panels may vary, implementing simple home maintenance strategies can significantly extend their lifespan. Tim Forcey, author of My Efficient Electric Home Handbook, shares his positive experience with solar panels installed in his Melbourne home in 2008. Despite treating them as a "science experiment," they continue to function flawlessly, with 22 additional panels installed in 2017 meeting all his home's electricity needs.
Forcey attributes the panels' longevity to a few key practices:
- Angle Installation: Installing panels at an angle prevents water and mud accumulation.
- Regular Cleaning: He uses a long-handled brush to keep the panels clean, removing any moss or lichen buildup.
Installation and Maintenance Best Practices
Brendan Lang, an electrician and founder of Get Off Gas, emphasizes three crucial factors for minimizing the risk of underperforming solar panels:
- Quality Products: Using high-quality products from the outset.
- Expert Installers: Engaging qualified local installers.
- Regular Maintenance: Scheduling routine maintenance checks every two to three years.
Lang advises, "Just as you wouldn't expect your car to run perfectly after 25 years without servicing, the same applies to renewable energy systems."
Regular maintenance offers additional benefits, including performance monitoring. If a significant drop in performance is detected, you can file a warranty claim (typically covering 25 years for quality panels).
Repair or Replace: Making the Right Decision
While all solar panels have a limited lifespan, deciding whether to repair or replace a faulty panel involves considering several factors.
If a single panel fails, finding a suitable replacement is possible, provided it matches the physical size and specifications of the original. Inverter issues, a common problem, can often be resolved with secondhand inverters installed by a skilled technician.
Finn Peacock of Solar Quotes suggests, "A reputable original installer will likely have spares or access to them from the manufacturer. As a last resort, you might remove or bypass the faulty panel, depending on the string configuration. This approach minimizes costs while maintaining the system's functionality, albeit with a reduced energy output of about 2 kWh per day."
For systems over six years old, replacing the entire array with more efficient panels is recommended. This upgrade can significantly boost energy production and potentially qualify you for the solar panel rebate again.
Recycling Responsibly
When replacing solar panels, ensure they are properly recycled. Peacock warns, "Don't assume that the people removing your panels will recycle them. Due to the cost of recycling ($30 per panel), they often end up in landfills. Insist on recycling and request a receipt to ensure proper disposal."
Peacock also recommends simple preventive measures to enhance panel longevity: avoiding permanent shade, regular servicing, and keeping leaves from accumulating beneath the panels.
