The solar panel is used for 25 years (or more), which is the industry warranty standard of the first-class manufacturer. In fact, the service life of the solar panel is much longer than this, and the warranty usually guarantees that it can work at 80% higher than its rated efficiency after 25 years. A study by NREL (National Renewable Energy Laboratory) shows that most solar panels can still generate energy after 25 years, although the energy has decreased slightly.
Investing in solar energy is a long-term behavior, and the initial cost may be high, but as time goes on, the investment will recover the cost by saving energy costs every month. For customers trying to invest in solar energy, the first question we often receive is: "How long can the solar panel last?"
The warranty period of the solar panel is usually 25 years, so it can meet your expectations in terms of time. Let's calculate: Solar panels lose 0.5% to 1% of their efficiency every year. At the end of the 25 year warranty, your solar panel should still generate energy at 75-87.5% of the rated output.
For example, a 300 watt panel should produce at least 240 watts (80% of its rated output) at the end of the 25 year warranty period. Some companies provide a 30 year warranty or promise 85% efficiency, but these are abnormal values. Solar panels also have a separate workmanship warranty to cover manufacturing defects such as junction box or frame failures. Generally, the process warranty period is 10 years, and some manufacturers provide a 20 year process warranty.
Many people will question whether the solar panel can be used for that long, and wonder what will happen after the 25 year pass? The panel output with 80% efficiency will still be valid, right? The answer here is yes! There is no doubt. If your solar panels still output energy, there is no reason to replace them.
Post time: Sep-22-2022