Investing in solar panels is a significant financial commitment that promises decades of clean energy and savings. Understanding solar panel warranties is essential to protecting this investment and ensuring you get the performance and longevity you’re paying for. Unlike traditional purchases, solar systems come with multiple warranty types that cover different aspects of your installation. This guide breaks down everything you need to know about panel warranties, from coverage terms to what they mean for your long-term savings.
Understanding the Two Main Types of Solar Panel Warranties
When you purchase solar panels, you’re typically covered by 2 distinct warranties that serve different purposes.
Product Warranty (Materials and Workmanship)
The product warranty, also called the materials or equipment warranty, covers manufacturing defects and physical failures of the solar panels themselves. This includes issues like frame corrosion, junction box failures, glass breakage due to manufacturing defects, or delamination of panel components.
Most reputable manufacturers offer product warranties ranging from 10 to 25 years, with premium brands typically providing 25-year coverage. This warranty ensures that if your panels fail due to faulty materials or workmanship, the manufacturer will repair or replace them at no cost to you.
Performance Warranty (Power Output Guarantee)
The performance warranty guarantees that your solar panels will maintain a certain level of electricity production over time. Solar panels naturally degrade slightly each year, producing less energy as they age. Performance warranties protect you against excessive degradation.
A typical performance warranty guarantees:
- Up to 90-92% of rated power output after 10 years
- Up to 80-85% of rated power output after 25 years
High-quality panels from premium manufacturers often guarantee 92% output at year 10 and 85% at year 25, while economy panels may offer lower guarantees.
What Solar Panel Warranties Typically Cover
Solar panel warranties are comprehensive but have specific limitations you should understand before making your purchase.
Product warranties generally cover:
- Manufacturing defects in materials
- Structural failures of the panel frame
- Junction box malfunctions
- Glass or backing sheet defects
- Internal wiring issues
Performance warranties cover:
- Power output degradation beyond the guaranteed threshold
- Efficiency losses that exceed normal degradation rates
What Solar Panel Warranties Don’t Cover
Understanding exclusions is just as important as knowing what’s covered. Most warranties won’t protect you against:
- Damage from improper installation
- Physical damage from extreme weather events (hail, hurricanes, falling debris)
- Issues caused by unauthorized modifications or repairs
- Normal wear and tear within acceptable degradation limits
- Damage from animals, vandalism, or accidents
- Problems arising from using the panels outside the manufacturer’s specifications
For weather-related damage and accidents, your homeowner’s insurance typically provides coverage. It’s worth confirming this with your insurance provider when you install your system.
Comparing Warranty Lengths Across Major Manufacturers
| Manufacturer Tier | Product Warranty | Performance Warranty (Year 25) | Annual Degradation Rate |
|---|---|---|---|
| Premium Brands | 25 years | ~85-90% output | 0.25-0.40% |
| Mid-Tier Brands | 12-15 years | 80-85% output | 0.45-0.55% |
| Economy Brands | 10-12 years | 80% output | 0.55-0.70% |
Premium Tier Manufacturers
Premium brands offer the longest warranties and best performance guarantees. These include:
- SunPower – 25-year product warranty, 92% output at year 25
- Panasonic – 25-year product warranty, 90.76% output at year 25
- REC Solar – 25-year product warranty, 92% output at year 25
- Maxeon – 25-year product warranty, 88% output at year 25
Mid-Tier Manufacturers
Mid-tier brands provide solid warranties at more affordable prices:
- Canadian Solar – 12-year product warranty, 84.8% output at year 25
- Trina Solar – 15-year product warranty, 84.8% output at year 25
- JA Solar – 12-year product warranty, 84.8% output at year 25
- LONGi Solar – 12-year product warranty, 84.8% output at year 25
Economy Tier Manufacturers
Economy brands focus on affordability with basic warranty coverage:
- Jinko Solar – 12-year product warranty, 84.8% output at year 25
- Risen Energy – 12-year product warranty, 80.68% output at year 25
- Astronergy – 12-year product warranty, 80.2% output at year 25
Premium manufacturers often guarantee lower annual degradation rates, meaning your panels will produce more electricity over their lifetime compared to economy options.
The Real-World Value of Extended Warranties
Longer warranties aren’t just marketing—they translate to real financial benefits. A panel with a 25-year product warranty and 0.3% annual degradation will produce significantly more electricity over its lifetime than a cheaper panel with a 10-year warranty and 0.6% degradation.
Consider this example: A 6kW system with premium panels might produce 180,000 kWh over 25 years, while an economy system of the same initial size might only produce 165,000 kWh due to faster degradation. At $0.13 per kWh, that’s a difference of nearly $2,000 in electricity value, often justifying the higher upfront cost.
Additionally, longer warranties provide peace of mind and can increase your home’s resale value, as prospective buyers appreciate the transferability of remaining warranty coverage.
How to Make a Warranty Claim
If you suspect your panels aren’t performing as expected, follow these steps:
- Document the issue – Gather monitoring data showing reduced output, take photos of any visible damage, and note when you first noticed the problem.
- Contact your installer first – They can often diagnose issues quickly and may identify problems with inverters, wiring, or other components rather than the panels themselves.
- Review your warranty documentation – Confirm that your issue is covered and that you’re within the warranty period.
- Contact the manufacturer – Most have dedicated warranty departments. Provide all documentation, purchase receipts, and evidence of the defect.
- Allow for inspection – The manufacturer may require a professional inspection to verify the claim before approving replacement or repair.
Note*Response times vary, but most manufacturers process claims within 2-4 weeks. Replacement panels are typically shipped within 30-60 days of claim approval.
Warranty Transferability and What It Means for Homeowners
Most solar panel warranties are transferable if you sell your home, though the process varies by manufacturer. Some brands offer full transferability with no fees, while others may require registration of the new owner or charge a small transfer fee.
Transferable warranties add value to your property because buyers know they’re protected against panel failures. When selling a home with solar panels, make sure to provide all warranty documentation to the new owners and help them complete any required transfer paperwork.
Protecting Your Investment Beyond the Warranty
While warranties provide essential coverage, taking proactive steps ensures your system performs optimally throughout its life:
- Regular cleaning – Remove dirt, leaves, and debris that reduce efficiency
- Professional inspections – Schedule checks every 3-5 years to identify potential issues early
- Monitor performance – Use your system’s monitoring app to track daily production and catch problems quickly
- Maintain proper documentation – Keep all receipts, warranty cards, and installation records in a safe place
- Choose certified installers – Work with NABCEP-certified professionals who follow best practices
According to the National Renewable Energy Laboratory, properly maintained solar systems can continue producing electricity for 30-35 years, well beyond typical warranty periods.
Frequently Asked Questions
What happens if the solar panel manufacturer goes out of business?
If a manufacturer goes bankrupt, their warranty obligations may be assumed by another company, but this isn’t guaranteed. This is why purchasing from established brands with strong financial backing is important. Some manufacturers also offer warranty insurance that remains valid even if the company ceases operations.
Can I extend my solar panel warranty?
Some manufacturers and third-party companies offer extended warranty options for an additional fee. Evaluate whether the cost justifies the benefit, especially since solar panels have proven highly reliable and many continue performing well beyond their warranty periods.
How do I know if my panels are underperforming?
Most modern solar systems include monitoring software that tracks daily production. Compare your actual output to the estimated production from your system design. A drop of more than 10-15% from expected values (accounting for seasonal variations and weather) may indicate an issue worth investigating.
Are inverter warranties the same as panel warranties?
No. Inverters typically have shorter warranties (5-12 years for string inverters, 15-25 years for microinverters) because they contain electronic components that wear out faster than solar panels. Many homeowners purchase extended inverter warranties due to this shorter coverage period.
Conclusion
Understanding solar panel warranties empowers you to make informed decisions that protect your investment for decades. By choosing panels with comprehensive product and performance warranties, you’re not just buying solar panels—you’re securing guaranteed energy production and peace of mind. Take time to compare warranty terms alongside price and efficiency ratings, and maintain proper documentation throughout your system’s lifetime. With the right coverage and care, your solar investment will deliver clean energy and savings well into the future.
