Understanding solar panel warranties
Solar panels typically come with two types of warranties: a product (material and workmanship) warranty and a performance warranty. Together they outline the manufacturer’s commitments and expected long-term behavior of the panels.
Product warranty
- Covers defects in materials and workmanship.
- Common durations range from 10 to 25 years depending on manufacturer and product tier.
- May cover premature failures, delamination, or manufacturing defects.
Performance warranty
- Guarantees a minimum power output over time, often specifying that panels will produce at least around 80–90% of labeled power after 25 years.
- Specifies an annual degradation rate (for example, 0.5% to 0.8% per year).
What’s typically excluded
- Damage from improper installation, accidents, storms beyond rated limits, or corrosion in extreme environments may not be covered unless noted.
- Some warranties require that installation be performed by certified installers or that certain maintenance is followed.
Practical considerations
- Warranty transferability: Check if warranties transfer to new owners and whether conditions apply.
- Financial strength of manufacturer: A warranty is only as good as the company behind it; choose reputable brands with solid track records.
- Keep documentation: Save purchase and installation records to make warranty claims easier if needed.
Warranties provide protection and peace of mind, but understanding their scope and requirements is important for long-term value.