What Is Solar Panel Degradation Rate?

What Is Solar Panel Degradation Rate?

In the element-rich conditions of the beautiful Victorian landscape, the adoption of solar energy has consistently soared to all-new heights.

With more than 30% of Australian households now installed with solar, the longevity and performance of solar panels become a consideration of paramount importance for those aiming for sustainable, bill-friendly living.

At the heart of the quest for quality solar lies the concept of degradation rate, a critical factor that determines the efficiency of solar panels over time.

In this article, we’ll delve into the world of solar technology, exploring the nuance of degradation rates in the Victorian market context and navigating the most essential considerations for choosing the best solar panels for your needs.

What is the ‘Degradation Rate’ of a Solar Panel?

The degradation rate of a solar panel refers to the gradual decline in its efficiency and energy output over time.

Generally, degradation rate is measured as a percentage of annual power output lost, reflecting the reduction in the panel’s ability to convert sunlight into electricity. This natural decline is influenced by various factors, including exposure to sunlight, temperature fluctuations, humidity, mechanical stress, and the quality of the solar panel’s materials and manufacturing.

To give a specific example, let’s consider a solar panel with an average degradation rate of 0.5% per year. If this panel starts with an initial output of 100 units of electricity, after the first year, it would experience a 0.5% reduction, resulting in an output of 99.5 units. This process continues annually, with the panel’s efficiency gradually decreasing. After 25 years, the panel’s efficiency would be approximately 87.5% of its original capacity, demonstrating the impact of the degradation rate on long-term performance.

It’s essential to note that advancements in solar technology have led to improved durability and reduced degradation rates in some high-quality panels, offering a more reliable and efficient energy solution over the panel’s lifespan.

You can see, then, how enquiring about a particular solar panel’s annual degradation rate is a great question to ask when you’re researching the best solar panels for your needs!

Does Degradation Rate Change over a Solar Panel’s Lifespan?

Correct. The degradation rate evolves over the lifespan of a solar panel.

Most residential solar panels are designed to operate efficiently for approximately 25 years before any noticeable decline in performance occurs. Even after this period, the panels continue to convert sunlight into energy, albeit at a reduced efficiency compared to their early days.

While it’s uncommon for a solar panel to cease energy production entirely, the degradation rate may eventually reach a point where replacing the panels becomes a practical consideration for both you and your household or business.

What are the Degradation Rates of Some Common Solar Panel Brands in Victoria?

While the median degradation rate of solar panels is approximately 0.5% per year, some brands – including those stocked by G Store – smash this out of the park.

Choosing the right solar panels involves considering the brand, quality and degradation rate, with G Store proudly offering wonderful panels from renowned manufacturers like REC and SunPower. These brands fall under the Tier One category, denoting manufacturers with a track record of five or more years in the industry, stable finances, and a reputation for outstanding service and product quality.

Tier One panels, exemplified by REC and SunPower, typically exhibit lower degradation rates. For instance, the degradation rate for Tier One solar panels hovers around 0.30% annually, compared to 0.50% for Tier Two and 0.80% for Tier Three.

Let’s zoom in on this a little. SunPower systems record an average degradation rate of -0.32% per year. REC solar panels, also stocked by G Store, boast an average annual degradation rate of no more than -0.25% and a guaranteed power output of at least 92% at year 25! Incredible.

What Else Should I Consider When Choosing the Best Solar Panels?

Knowing what questions to ask when selecting your best solar panels and solar retailer is vital. Consider the following list of factors to help form a comprehensive evaluation of what’s best for you:

• Quality: Go for trusted manufacturers with a proven history, stable finances, and extended product warranties. Look for warranties lasting 25 years or more.
• Installation: It’s important to make sure that your solar panels are installed by experienced professionals with the proper accreditations to guarantee their longevity. Proper installation can prevent issues that may lead to faster degradation.
• Climate: This is a big one! Factor in the climate of your location, as it significantly influences the efficiency and lifespan of whatever solar PV system you choose. Hotter climates, for example, may contribute to faster degradation, while extreme weather events pose risks.
• Maintenance: Regular cleaning and upkeep can contribute to extending the lifespan of your solar panels. Removing debris, such as leaves and dirt, helps prevent scratches and maintains optimal efficiency.
• Warranty: Take a look at the standard warranties and guarantees offered by the solar panel manufacturer. Extended warranties, spanning up to 40 years for SunPower panels, will help ensure your peace-of-mind.

A Final Thought on Solar Panel quality

Investing in solar panels requires a thoughtful approach, considering these factors will enable you to make an informed decision for a sustainable and cost-effective energy solution.

As solar technology continues to advance, the longevity of solar panels remains a wonderfully important factor in achieving greater energy security and transitioning away from fossil fuels. In Victoria, the financial benefits of solar panels, with an average payback time of 3 to 5 years, make them a worthwhile investment for everyone.

Wrapping up

Looking for more info on the best solar panels available in Victoria, plus the brands and models we stock and recommend at G Store?

Visit our Learning Centre today, or give our award-winning G Store team a call today on 1300 137 567 for free, generous advice regarding all of your questions.

We can’t wait to meet you.