When purchasing a 540W solar panel, you can generally expect the following types of warranty coverage:

1. Product Warranty

• Coverage Duration: 15 to 25 years.
• Scope: Covers defects in materials and workmanship, ensuring that the panel is free from manufacturing flaws for the warranty period.

2. Performance Warranty

• Coverage Duration: 25 to 30 years.
• Power Output Guarantee: Ensures the panel will retain a certain percentage of its rated power output over time.
  • Example:
    • 97.5% of rated power in the first year.
    • Degradation of no more than 0.7% per year, resulting in at least 80% of the original power output after 25 years.

Typical Warranty Terms:

• 10 years at 90% power output.
• 25 years at 80% power output.

In summary, high-quality 540W solar panels typically offer a 15-25 year product warranty and a 25-30 year performance warranty, ensuring reliability and a guaranteed power output of 80-90% over the panel’s lifetime.