Solar panels represent a significant long-term investment, so it’s important to understand their durability and potential return on investment. One of the most common questions homeowners ask is how long their solar panels will last. Will they remain efficient for 2, 5, 10, or even 15 to 20 years? The answer to this question can significantly influence the decision to go solar. Below, we explore the lifespan of solar panels and how they degrade over time.
Average Lifetime of Solar Panels
Great news for potential solar adopters: most solar panels come with a 25-year warranty, and the majority outlast this period. This long lifespan makes solar panels a particularly attractive investment. Few home improvements offer the durability and longevity of solar panels. While some panels have shorter warranties of 10 to 15 years, these still often exceed their expected lifespans. Opting for panels with longer warranties can provide additional peace of mind.
Solar Panel Degradation Rate
Solar panels do experience a degradation rate, meaning their efficiency in producing energy diminishes slightly each year. However, this degradation is minimal. According to the National Renewable Energy Laboratory (NREL), the average annual degradation rate is approximately 0.5% to 0.8%. This means that even after 25 years, your solar panels should still operate at around 80% of their original efficiency.
Standard Solar Panel Warranties
A typical solar panel warranty lasts for 25 years, guaranteeing that the panels will operate at peak efficiency during this period. The warranty serves as an indicator of the panel’s expected lifespan. Generally, the longer the warranty, the more confidence the manufacturer has in the product’s durability and longevity.
What Types of Solar Panels Last the Longest?
Quality is a crucial factor in determining the longevity of solar panels. High-quality solar panels from reputable manufacturers tend to last longer and perform better over time.
Some of the top-rated solar panels include:
- SunPower
- LG
- Panasonic
- Q CELLS
- Canadian Solar
- JinkoSolar
- Trina Solar
- REC Solar
- Silfab
Among these, SunPower, LG, and Panasonic are frequently highlighted for their high efficiency, competitive pricing, and strong 25-year warranties.
How to Make Your Solar Panels Last Longer
While solar panels have no moving parts and are generally low-maintenance, there are a few steps you can take to ensure they last as long as possible.
Regular Maintenance and Inspections
Scheduling regular check-ups with your solar provider can help maintain peak performance. Professionals can inspect connections, clean inverters, and ensure compliance with local codes. Regular maintenance helps catch potential issues early, preventing costly repairs.
Replacing Inverters
Inverters typically have a shorter lifespan than solar panels, usually around 10 to 15 years. You may need to replace your inverter once or twice during the lifespan of your panels. Investing in high-quality inverters or microinverters, which often come with longer warranties, can align their lifespan with that of your panels.
Keeping Panels Clean
Maintaining clean solar panels ensures maximum efficiency. While installers usually position panels to avoid shading and debris, periodic cleaning to remove dust, leaves, and other obstructions can improve performance. Consider installing critter guards to protect panels from animals.
Ready to Go Solar? We’re Here to Help!
Our solar consultants are experts in their field, ready to help you choose solar panels that will last and perform beyond their warranties. We have extensive experience in guiding families and businesses through the process of going solar.
Contact us to schedule a free consultation and receive a personalized quote. We offer flexible meeting options, including virtual consultations via Facetime or Zoom, phone calls, and in-person meetings in your front yard.