How long do solar panels last?

Discover the Long-Term Benefits of Solar Panels

Making the shift to renewable energy is a big decision, and when it comes to solar panels, it’s clear they’re built to deliver exceptional value. Designed to last, most solar panels come with warranties spanning 10 to 25 years, offering peace of mind for decades.

However, there are a number of factors that can effect the life of your solar panels and should be considered before you get an installation.

Solar panels are engineered for longevity, maintaining approximately 80% of their original efficiency even 25 years after installation. For example, a 405-watt panel installed today could still produce 324 watts of energy after a quarter of a century. With degradation rates as low as 0.5% per year, these panels are reliable performers for the long term.

What this means is that your output of energy gained from the sun is going to remain consistent across the year, so you can plan your energy needs and know exactly how much energy you can expect to generate.

If efficiency does decline over time, you can expand your system by adding more panels—provided your inverter has the capacity—to keep your energy output steady.

With an average payback period of 7 to 9 years, solar panels deliver years of cost-free energy once the system is paid off. For most homeowners, this means 14 to 21 years of savings—well beyond the initial investment.

This saving can be increased with an optional storage battery as there are plenty of energy saving tricks you can perform with the inclusion of this device.

Solar panels typically come with two types of warranties:

1. Performance Guarantee
   This ensures your panels will deliver consistent energy output over their lifetime. Look for brands that promise at least 90% efficiency after 10 years and 80% after 25 years, with some extending to 30 years as technology advances.
2. Product Coverage
   This warranty protects against manufacturing flaws, environmental wear, and other issues resulting from faulty construction. Most product warranties span 10 years, with optional extensions available. Discuss these options with your installer to ensure you’re fully covered.

Although solar panels are durable, certain conditions can impact their performance:

• Temperature: Prolonged high heat can affect solar cells. Fortunately, the UK's mild climate is ideal for maintaining panel efficiency, with most systems still performing at 95% capacity after 20 years.
• Installation Angle: Panels installed at angles below 20° or above 50° may be more prone to water pooling and debris buildup, which can lead to internal damage over time.
  While this can be effected by roof inclination, a skilled installer will find a way to get your panels within this optimal inclination. To maximise the life of your panels.

String Configuration: Solar panels are connected in series to create an energy flow to the inverter. A malfunctioning panel can reduce the output of the entire string and even cause damage to other panels by absorbing excess current. Regular monitoring is key to preventing this. Many solar systems have apps and screens to monitor the performance of your panels, make sure to keep and eye on these are report any unusual readings.

Low Maintenance Requirements

Solar panels require minimal upkeep. With no moving parts, there’s little risk of mechanical failure. Just keep the panels clean and free from obstructions like leaves or bird droppings.

Monitor Performance

Most systems include inverters with indicator lights. A green light means the system is functioning correctly, while orange or red signals a problem. Check the inverter regularly, and contact a professional if any issues arise. (Oh hey, if you have an issue you should get in touch with us here at Gasway)

Cleaning

Rain typically keeps panels clean, but persistent dirt, such as tree sap or bird droppings, may require manual cleaning. Use soft brushes or cloths and avoid harsh chemicals to protect the panel surface.

One of the most important steps in ensuring your solar panels last is selecting a qualified installer. Look for professionals accredited by trusted organizations like MCS, NAPIT, or HIES. Research their track record, read customer reviews, and confirm their certifications to ensure you’re making the right choice.

There are companies out there that might pretend to be accredited under these bodies, you can check If the company is actually registered by searching for them on the relevant bodies website register.

You can find all of the accreditations that Gasway Services LTD holds here—renewable Accreditation.

With decades of durability, minimal maintenance, and strong warranties, solar panels are an investment that pays for itself and continues to deliver value.

Gasway does much more than Gas. Ready to go green? Contact us today to learn how we can help you transform your home with solar energy!