Is That Solar Panel Really Worth It? How To Check Solar Panel Quality Before You Buy

For business owners and landlords looking to reduce energy costs and increase energy independence, a solar and battery system can be a game-changer. However, the effectiveness of your system hinges on the quality of the solar panels you select. Inferior panels can lead to reduced energy production, increased maintenance costs, and a slower return on investment. This guide provides a comprehensive overview of how to assess solar panel quality, ensuring you make a sound investment that delivers long-term benefits.

Why Solar Panel Quality Matters

Solar panel quality is not just about the brand name; it’s about the tangible factors that directly impact performance, durability, and return on investment. High-quality panels offer several key advantages:

• Higher Energy Production: More efficient panels generate more electricity from the same amount of sunlight, leading to greater energy savings.
• Longer Lifespan: Durable panels withstand harsh weather conditions and degrade more slowly, ensuring consistent performance over their lifespan.
• Lower Maintenance Costs: Reliable panels require less frequent maintenance and repairs, reducing ongoing expenses.
• Better Return on Investment: While higher-quality panels may have a higher upfront cost, their superior performance and longevity translate to greater long-term savings and a faster ROI.

1. Verify Manufacturer Reputation

The manufacturer’s reputation is a good indicator of the solar panel’s quality. Look for companies with a proven track record of producing reliable and high-performing panels. Here’s what to consider:

• Years in the Industry: Companies with at least 10 years of experience are more likely to have established quality control processes and a history of honoring warranties.
• Customer Reviews and Ratings: Online reviews and ratings can provide valuable insights into customer experiences with different brands. Look for consistent positive feedback regarding panel performance, durability, and customer service.
• Financial Stability: Ensure the manufacturer is financially stable and likely to remain in business for the long term. This is crucial for warranty claims and after-sales support.

Example: A business owner considering a solar and battery system might research manufacturers like SunPower, LG, or REC Group, known for their high-quality panels and strong warranties.

2. Check Efficiency Ratings

Solar panel efficiency refers to the percentage of sunlight that a panel can convert into electricity. Higher efficiency ratings mean more power generation from the same surface area. Here’s how to assess efficiency:

• Look for High-Efficiency Panels: Panels with efficiencies above 20% are considered high-efficiency and can maximise energy production, especially in limited space.
• Compare Ratings: Compare efficiency ratings across different brands and models to determine which panels offer the best performance.
• Consider Long-Term Value: While high-efficiency panels may cost more upfront, they provide better returns over time due to increased energy production.

Example: A landlord with limited roof space on a commercial property might prioritise high-efficiency panels to maximise energy generation and reduce reliance on the grid.

3. Examine Certifications and Standards

Certifications and standards ensure that solar panels meet specific quality and safety requirements. In Australia, look for the following:

• Clean Energy Council (CEC) Approval: Only CEC-approved panels qualify for government rebates and incentives like Small-scale Technology Certificates (STCs).
• 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.

Buying Signal: Seeing panels with CEC approval can give a potential buyer peace of mind that they are purchasing a product that meets Australian standards and is eligible for government incentives.

4. Assess Build Quality and Materials

The construction and materials used in a solar panel significantly impact its durability and performance. Here’s what to look for:

• Tempered Glass: High-quality panels use tempered glass to protect against impacts and weather damage.
• Sturdy Aluminium Frames: Robust frames provide structural support and prevent warping or bending.
• Strong Encapsulation Layers: Encapsulation layers protect the solar cells from moisture and corrosion.
• Avoid Defects: Inspect panels for visible defects, cracks, or poor sealing, which can lead to performance issues.

Example: A business owner in a coastal area should prioritise panels with strong encapsulation layers to protect against salt spray and corrosion.

5. Evaluate Temperature Coefficient

The temperature coefficient indicates how well a panel performs in high temperatures. Solar panels tend to lose efficiency as their temperature increases. A lower (more negative) temperature coefficient is better.

• Lower Percentage is Better: Look for panels with a temperature coefficient closer to -0.3% per degree Celsius.
• Impact on Performance: Panels with poor temperature coefficients may lose significant output in warm climates.

6. Compare Performance in Low-Light Conditions

Solar panels should generate power even in cloudy or low-light conditions. Check the technical specifications for low-light performance, typically tested at 200 W/m².

• Maximise Energy Generation: Panels with better low-light efficiency maximise energy generation throughout the day.
• Real-World Conditions: This is particularly important for regions with frequent cloud cover or shaded areas.

7. Analyse Degradation Rate

Solar panels degrade over time, reducing their output efficiency. A low degradation rate ensures that the panel maintains its performance longer.

• Low Degradation Rate: Look for panels with a degradation rate of 0.3% to 0.5% per year.
• Warranty Review: Review manufacturer warranties to 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).

Buying Signal: A long performance warranty can reassure a buyer that the panels will maintain a high level of energy production for many years to come.

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.

Example: A landlord might see a higher upfront cost for premium panels as a worthwhile investment, given the lower maintenance and higher energy output over the system’s lifespan, ultimately leading to a greater return on investment.

Conclusions

Choosing the right solar panels is a crucial decision for any homeowner, business owner, or landlord looking to invest in a solar and battery system. By carefully considering factors such as manufacturer reputation, efficiency, certifications, build quality, and warranty terms, you can ensure that you’re making an informed decision that will maximise your energy savings and provide long-term reliability. Investing in quality panels is an investment in a sustainable and cost-effective energy future.