How long do solar panels last?

Key takeaways

• Monocrystalline panels: up to 40 years lifespan, ~0.5% annual degradation.

• Polycrystalline panels: up to 35 years lifespan, similar degradation rate.

• Thin-film panels: 10–20 years lifespan, degrade faster than crystalline silicon.

• Longevity depends on installation quality, maintenance, environmental conditions, and manufacturer guidelines.

• Regular monitoring, cleaning, and professional inspections maximise lifespan and performance.
  
  

To ensure your solar panels last, monitor them regularly and seek professional assistance for repairs or inspections.

How long do solar panels last?

Investing in solar panels is an excellent way to reduce both your carbon footprint and electricity bills. By splitting complex explanations into shorter statements, we aim to improve readability and comprehension.

Like all technology, solar panels degrade over time. Before switching to this renewable energy, learn how to maximise their use and make the most of your money. Here, we look at how long solar panels last and ways to extend their lifespan.

First, let's quickly explain how a solar power system works.

How do solar panels work?

Regardless of the type of solar panels you have, they all work in the same way:

1. Sunlight hits the solar panels

2. Photons of light are transferred into the panels

3. The light frees the electrons in the panels from their atomic bonds

4. The solar cells collect these electrons to generate an electrical current

5. This electricity is collected in direct current (DC) form before being converted into alternating current (AC) by an inverter
   
   

What factors affect how long solar panels last?

Several things affect how long solar panels last, including:

1. The quality of the materials used

The saying “buy cheap, buy twice” applies to solar panels. High-quality materials and components help panels last longer than cheap alternatives. Research solar panel manufacturers before you buy.

2. How well the panels are maintained

Keep panels clean and well maintained to extend their life. Have a qualified technician inspect them each year. Remove debris and dirt to prevent damage and boost performance.

3. Quality of the solar installation

Poor installation can reduce your solar panels’ efficiency and lifespan. Use trained installers for proper solar installation to avoid structural issues, water leaks, and other problems.

4. The rate of degradation

On average, solar panels degrade at a rate of around 0.5% per year (NREL), with a typical lifespan of about 25 years (Energy Saving Trust). “With proper care, panels can continue producing significant energy well beyond their expected lifespan,” notes a certified installer.

5. Environmental factors

Weather affects solar panel lifespan, especially extreme heat, snow, or hail. You can't avoid harsh weather, but it does shorten panel life.

How to extend the lifespan of your solar panel system

To ensure a good return on your investment, adhere to solar panel warranties, and extend the lifespan of your system, keep on top of the following:

Clean your solar panels regularly

• Remove debris like bird droppings to keep performance high. Always follow the manufacturer’s advice. How to clean your solar panels.

Organise inspections

• Have a trained professional inspect for issues like loose wiring or corrosion.

Monitor performance

• Use monitoring software to track degradation. A 5% drop year-over-year signals a fault. Many systems provide real-time alerts. Annual inspections cost £100–£150.

Manage shading and obstructions

• Keep trees or shrubs trimmed so they don’t block sunlight.

Adhere to manufacturer’s guidelines

• Follow the instructions to maximise lifespan and preserve warranties.

Implement control measures for weather

• Weather guards can help protect against snow and hail.
  
  

The lifespan of different solar panel types

The three main types of solar panels used in the UK are:

Monocrystalline solar panels

Made from a single silicon crystal. Efficient, can last up to 40 years. 

Polycrystalline solar panels

Made from multiple silicon crystals. Cheaper, can last up to 35 years. 

Thin-film solar panels

Made from materials like CIGS or CdTe. Lighter and flexible, but with lower efficiency. Typical lifespan 10–20 years.

Solar panel installation with BOXT

With BOXT, you’ll get a solar panel system that reduces energy bills and your carbon footprint. You’ll also get 12-year product and 25-year performance warranties. Finance options are available, and installation can be completed within 2 weeks.

Get started by filling in our easy online form, and we’ll provide tailored solar panel quotes for your home.