The answer is 25 years or even longer. It is the industry standard warranty from Tier 1 manufacturers. Solar panels can even last longer than 25 years: the warranty guarantees solar panels work above 80% of their rated efficiency after 25 years. NREL study shows that a great number of panels still produce energy after 25 years.

Today the investment in solar energy pays for itself over time through tax incentives and monthly savings on your energy bill. So the question “how long do solar panels last?” arises.


Every year solar panels suffer a 0.5% to 1% efficiency loss. After 25 years warranty, your panels still produce energy at 7587.5% of their rated output.

NREL study shows that nearly 80% of solar panels last longer than their warranty. For instance, a 300 watts panel should produce 80% of its rated output – at least 240 watts, at the end of the 25th year.

There are companies, which offer 30 years warranties or promise 85% efficiency but do not believe them. The standard length of the usage is 25 years at 80% efficiency.

You can also find a separate workmanship warranty for solar panels in some companies, which covers any manufacturing defects. In general, the workmanship warranty is 10 years to 20 years.


If your solar panels still give energy after 25 years then, there’s no need to replace them.

What is the degradation rate?

Degradation rate is the rate when solar panels lose efficiency. For example, a panel with a degradation rate of 1% per year loses 3% efficiency in the first year.

So after 25 years of usage, about 4 out of 5 solar panels operate at nearly 75% efficiency or even better.

Source – here

Solaron is the first and only manufacturer of solar panels in Armenia, which production capacity reaches more than 60 megawatts. So if you are thinking of connecting to the sun in Armenia, then do not hesitate to find the best solar panels in Solaron company.