Solar Panel Quality: Simple Steps to Check Before You Buy

Investing in solar panels is a long-term commitment, and choosing the right ones can significantly impact energy savings and performance. Solar panel quality varies across brands, making it essential to identify high-performing options over subpar ones. By assessing key factors such as efficiency, durability, and certifications, you can ensure your solar investment delivers optimal results for years to come.

Steps to Check Solar Panel Quality

Here are simple steps to check solar panel quality before making a purchase.

1. Verify Manufacturer Reputation

A well-established manufacturer with a history of producing reliable solar panels is a good indicator of quality. Look for companies with at least 10 years in the industry and positive customer reviews. Research warranty terms and after-sales support, as reputable brands offer longer warranties, typically ranging from 10 to 25 years.

2. Check Efficiency Ratings

Solar panel efficiency determines how much sunlight converts into electricity. High-efficiency panels (above 20%) generate more power in limited space. While premium panels may cost more, they provide better returns over time. Compare efficiency ratings across different brands to make an informed choice.

Useful Article: What Are the Most Efficient Solar Panels?

3. Examine Certifications and Standards

Solar panels must meet strict quality and safety standards to ensure reliable performance over time. In Australia, it’s essential to check for Clean Energy Council (CEC) approval, as only CEC-listed panels qualify for government rebates like Small-scale Technology Certificates (STCs).

Additionally, look for internationally recognised certifications that confirm durability, efficiency, and safety:

IEC 61215: Verifies long-term performance under real-world conditions.
IEC 61730: Ensures panels meet electrical and safety requirements.
ISO 9001: Confirms the manufacturer follows high-quality production processes.

Checking for these certifications helps guarantee that the panels have been rigorously tested and comply with both Australian and global standards.

4. Assess Build Quality and Materials

Inspect the panel’s construction for durability. High-quality panels feature tempered glass, sturdy aluminium frames, and strong encapsulation layers to protect against weather conditions. Avoid panels with visible defects, cracks, or poor sealing, as they can lead to performance issues.

Related Article: How Long Do Solar Panels Last?

5. Evaluate Temperature Coefficient

The temperature coefficient indicates how well a panel performs in high temperatures. A lower percentage (closer to -0.3% per degree Celsius) means better efficiency in hot conditions. Panels with poor temperature coefficients may lose significant output in warm climates.

6. Compare Performance in Low-Light Conditions

Quality solar panels generate power even in cloudy or low-light conditions. Check technical specifications for low-light performance, typically tested at 200 W/m². Panels with better low-light efficiency maximise energy generation throughout the day.

7. Analyse Degradation Rate

Solar panels degrade over time, reducing output efficiency. A low degradation rate (0.3% to 0.5% per year) means the panel will maintain its performance longer. Reviewing manufacturer warranties can help determine long-term reliability and expected performance over the panel’s lifespan.

8. Review Warranty and Performance Guarantees

A strong warranty reflects a manufacturer’s confidence in its product. Standard warranties include:

Product Warranty: Covers manufacturing defects (typically 10-15 years).
Performance Warranty: Ensures efficiency levels over time (often 80-90% of initial capacity after 25 years).

Choose panels with solid warranties from reputable brands.

9. Research Third-Party Testing and Reviews

Independent testing organisations, such as TÜV Rheinland, publish reliability reports on different brands. Reviewing these reports, along with user feedback, provides insight into real-world performance and reliability.

10. Consider Cost vs. Value

While price is an important factor, the cheapest option isn’t always the best. Consider long-term value, factoring in efficiency, durability, warranty, and degradation rate. A slightly higher upfront cost for quality panels can lead to greater savings and performance over time.

Learn More: Solar Panel Installation Cost: A Detailed Guide

Final Thoughts

Checking solar panel quality before buying ensures a reliable and efficient investment. By considering manufacturer reputation, efficiency, certifications, build quality, and warranty terms, you can make an informed decision that maximises energy output and long-term savings. Taking these simple steps will help you choose the best solar panels for your needs.