Plenty of households and businesses around Australia have made the switch to solar, and it’s easy to see why. But once it’s all set up, one of the most common questions is how long it’ll keep working. While solar panels are built to last, their lifespan can vary depending on several factors.
So, how long do solar panels last in Australia? Let’s take a closer look at what affects longevity and what you can expect over time.
What’s the Average Lifespan of Solar Panels?
Most people are happy to hear that once they’ve got panels on the roof, they’re good for decades, but how long are we actually talking? On average, solar panels in Australia last somewhere between 25 to 30 years, depending on factors like brand, installation, and local climate.
Reaching that age doesn’t mean they suddenly stop working; it just means their output slowly tapers off over time. This is known as solar panel degradation, and it’s completely normal.
The yearly drop in efficiency is usually small, around 0.7% to 0.8% for most panels today. So after 25 years, you’re still likely to get around 80% of the original output. So, how long do solar panels last in Australia? Long enough to pay off over time, especially with regular solar panel maintenance.
What Affects How Long Solar Panels Last?
Just like anything that lives on your roof for decades, solar panels are going to age, but how fast that happens depends on a few key factors. Some are built into the system itself, while others come down to solar panel installation and how it’s looked after.
- Panel quality – Well-made panels usually hold up better over time, staying efficient and less prone to issues like moisture damage or worn-out cells that can drag down your daily output.
- Location and weather – Panels exposed to intense sun, coastal air, or frequent storms may wear down more quickly due to UV exposure, salt corrosion, or temperature stress.
- Maintenance – Dust, grime, or even small cracks can cut into output over time, so regular inspections and cleaning help prevent performance loss and keep your system working closer to its full capacity.
- Inverter performance – Because inverters process the electricity your panels generate, a faulty or aging inverter can bottleneck your whole system and cause a drop in the usable power reaching your home.
Understanding Solar Panel and Inverter Warranties
You’ve probably seen the word ‘warranty’ thrown around a lot when comparing solar systems, but how much does that really cover down the track? One of the most common questions people ask is how long do solar panels last in Australia, and warranties give you a good window into what to expect.
Solar panels generally come with two types of warranties:
- Product warranty – Covers manufacturing defects or faults that show up early on. These usually last between 10 and 15 years, depending on the brand.
- Performance warranty – This one usually lasts around 25 years and guarantees your panels will still be producing a set percentage of their original output by the end of that period. Some brands now offer up to 30 years, especially on newer models built to degrade more slowly.
- What’s not covered – Warranties won’t cover damage caused by storms, poor installation or misuse. But under normal conditions, they offer a solid benchmark for what kind of performance you can expect over time.
What about inverter warranties?
Your inverter is what turns the DC power your panels make into usable electricity, and it works harder doing that day in and out. Most inverters come with warranties between 5 and 12 years, and many will need replacing at least once during your system’s lifetime. If your panels seem fine but your output drops, the inverter is often the first place to check.
How to Extend the Life of Your Solar System
Just like anything that lives outside, solar systems can cop wear and tear over time. But with a few simple habits and the occasional check-in, you can help yours stay in good shape.
Give your panels a regular once-over.
A quick visual check every now and then can help spot cracked glass, dodgy wiring, or anything out of place. If something looks off, it’s best to call in a professional to check.
Keep the panels clean.
Dirt, bird droppings, and leafy gunk can block sunlight and affect efficiency. A gentle clean with water and a soft cloth can help them stay clear and working at their best.
Trim nearby trees or overhanging branches.
Shadow can affect how well your system works, especially if they keep moving across the panels during the day. Trimming branches back reduces leaf litter as well and limits scratches or damage from falling debris.
Get your system serviced every few years.
Professional maintenance helps catch small issues early and ensures things like your inverter are still functioning well. It also gives you a better idea of how your system’s performing overall.
Keep an eye on your energy output.
Most systems have a monitoring app or portal you can check. If you notice a sudden dip in daily production and the weather’s been fine, it might be time to get your residential solar panel looked at.
What to Expect as Panels Age
Even the best solar panels slow down a little over time, but they’re built to stick around. Most systems still deliver solid performance well past the 20-year mark, even if their output isn’t quite what it was on day one.
You might notice a gradual drop in daily generation, but it’s usually predictable and steady rather than sharp or sudden. Pairing your system with a solar battery can help smooth things out, storing excess power when conditions are ideal so you’ve got backup on lower-yield days.
When it really comes down to it, there’s more to panel lifespan than just the warranty sticker. Things like location, maintenance, and the right installer can all make a huge difference over time.
If you’re curious how long do solar panels last in Australia, O'Brien Electrical & Plumbing Rowville can walk you through what to expect and how to get the most out of your system. Contact us if you’d like a hand planning ahead or fine-tuning your current setup.
FAQs
Can older solar panels still be used after their warranty ends?
Yes, many panels continue generating electricity well after the warranty runs out, although they tend to produce less than they did at the start. As long as the system is still safe and functioning, older panels can still contribute useful power.
What are the signs that a solar panel system needs replacing?
You may need to have your solar panel system checked or replaced if you notice the following:
- Noticeably lower power output despite good weather
- Cracks, corrosion or burn marks on panels
- Discolouration or delamination of the panel surface
- Frequent inverter faults or error codes
- Physical damage from weather or wear
How do Australian weather conditions impact solar panel longevity?
Australia’s strong sun, high heat, and seasonal storms can all add to the wear on a solar system. UV exposure, thermal stress, and hail or debris in bad weather can speed up physical degradation, especially in poorly made or ageing panels.
Do solar panels degrade faster in coastal areas?
Coastal air carries more salt, which can accelerate corrosion in panels and wiring if the system isn’t properly sealed or maintained. Choosing panels with a high corrosion rating and doing regular checks can help manage this risk.
Can you upgrade individual panels without replacing the whole system?
You can, but it depends on the setup. Some older systems may not be compatible with newer panel models. If the system allows it, swapping out a few panels is possible, especially if you’re dealing with damage or want a performance boost. If you’re unsure, our friendly team is happy to configure your setup or recommend the best option for your system.