Are Solar Panels Recyclable? Lifespan, Materials and WEEE Rules

Yes, solar panels are recyclable. In the UK they are classed as waste electrical and electronic equipment (WEEE) and must be recycled at a suitable treatment facility rather than sent to landfill. Glass, aluminium, silicon, copper and silver can all be separated and returned to manufacturing, and Waste Experts recovers up to 95% of panel materials through its ROSI partnership.

This guide explains how long solar panels last, what is inside them, how recycling works and what businesses, landlords and installers need to do when panels reach the end of their life.

Solar panel lifespan: how long do solar panels last?

The Energy Saving Trust says solar panels should last 25 years or more. The US Department of Energy reports that the average expected operating life of panels has risen from around 20 years in 2007 to 25 to 35 years, based on Berkeley Lab survey data. Most panel warranties are built around a similar timescale.

Panels do not simply stop working at the end of that period. They slowly lose output. Research from the US National Renewable Energy Laboratory found a median degradation rate of around 0.5% per year for crystalline silicon modules, although lower-quality products can degrade faster.

In practice, panels reach the waste stream for several reasons, often well before 25 years:

• Repowering: older, lower-output panels are replaced with more efficient ones.
• Damage: storm, hail, fire or impact damage, or cracked glass from handling.
• Roof works: panels removed for roof repairs or building refurbishment and not refitted.
• Faults: manufacturing defects, failed junction boxes or delamination.
• Decommissioning: the end of a lease or planning consent on a solar farm.

Inverters usually fail first. The Energy Saving Trust says an inverter needs replacing after around 12 years, so most systems produce inverter waste at least once before the panels themselves are retired.

What are solar panels made of?

A typical crystalline silicon panel is mostly glass by weight, held in an aluminium frame. Inside are:

• Tempered glass on the front face
• An aluminium frame around the edge
• Silicon cells that convert light into electricity
• Silver and copper conductors and ribbons that carry the current
• Polymer layers: an encapsulant that bonds the cells to the glass, and a plastic backsheet
• A junction box and cables on the rear
• Lead-based solder in many crystalline silicon panels

Thin film panels are built differently and can contain cadmium telluride or other compounds. Because of the lead and cadmium content, panels must not be broken up on site, stored where they can be damaged and leach into the ground, or sent to landfill. Thin film panels may need to be handled as hazardous waste, so always tell your recycler which panel type you have.

Are solar panels WEEE? Category 14 explained

Yes. GOV.UK guidance on equipment covered by the WEEE Regulations lists photovoltaic panels as reporting Category 14 under the Waste Electrical and Electronic Equipment Regulations 2013. The same guidance says:

• All PV panels are electrical and electronic equipment.
• Because panels are of a generic size and design, they are reported as household (B2C) WEEE wherever they are installed, including on commercial premises and in solar farms.
• The Environment Agency does not treat solar farms as large-scale fixed installations, so they are not excluded from WEEE.

For businesses, this means waste panels must go through a WEEE route to a treatment facility that can handle them. For anyone placing panels on the UK market, including manufacturers and importers, it means producer obligations under the WEEE Regulations. Our sister compliance scheme WERCS supports producers with those obligations. For a wider view of WEEE, read our guide to what WEEE is.

How a solar panel is taken apart and recovered

Basic recycling removes the frame and junction box, then shreds or crushes the rest. That recovers aluminium and some glass but leaves the silicon, silver and polymers mixed together. More advanced processes go further:

1. Collection and inspection. Panels are checked, counted and recorded against the waste paperwork.
2. Dismantling. The aluminium frame, junction box and cables are removed.
3. Delamination. The polymer layers holding the panel together are broken down so the glass can be separated cleanly from the cells.
4. Separation. Glass, silicon, silver and copper are recovered as separate streams at a purity suited to reuse.
5. Return to manufacturing. Recovered materials go back into production rather than landfill.

Our article on solar panel disposal for UK businesses explains why the gap between basic and advanced recycling matters for your environmental reporting.

Inverters and batteries alongside panels

A solar system is more than panels. When you plan disposal, include:

• Inverters, which are WEEE and are usually replaced at least once in a system's life.
• Battery storage, usually lithium-ion. These are dangerous goods for transport and need fire-safe containers and an ADR-compliant carrier. Larger systems are covered by our BESS recycling service.
• Cabling, isolators and mounting systems, which can often be recycled with other metals and electrical waste.
• EV chargers installed with the system, which are also WEEE. See our EV charger recycling page.

Can solar panels be reused instead of recycled?

Sometimes. Panels removed during repowering or roof works may still produce useful power, and the waste hierarchy puts reuse ahead of recycling. Reuse only works when panels are tested, physically sound and safe to reinstall, and when someone genuinely wants them. Cracked glass, scorch marks, delamination, water ingress, damaged frames and failed junction boxes all mean a panel is waste and must be recycled.

Signs that panels are reaching the end of their working life include:

• Output that has fallen noticeably below what the system was designed to produce
• Visible browning, discolouration or bubbles in the encapsulant
• Hot spots or burn marks on the cells or backsheet
• Cracked or shattered front glass
• Corroded connectors or a damaged junction box

If a panel has been taken off a roof with no plan for reuse, treat it as WEEE from that point and store it safely until collection.

What businesses and installers must do

1. Keep panels out of skips and general waste. Panels are WEEE and need a dedicated recycling route.
2. Store removed panels safely. Stack them flat on pallets, glass side up, strapped and protected from weather, so the glass does not break.
3. Separate damaged and thin film panels and tell your recycler about them before collection.
4. Use a registered waste carrier and a permitted treatment facility, as your waste duty of care requires.
5. Keep the paperwork. A waste transfer note for each load, kept for two years, and a hazardous waste consignment note where panels or batteries are hazardous.
6. Agree responsibilities in writing. On replacement jobs, decide up front whether the installer or the site owner arranges disposal, and who holds the paperwork.
7. Plan large projects early. Solar farm decommissioning involves thousands of panels, inverters and cabling. Our guide to solar farm decommissioning covers planning for that scale.

Frequently Asked Questions

Are solar panels recyclable?

Yes. Solar panels are WEEE and can be recycled at a suitable treatment facility, where glass, aluminium, silicon, copper and silver are separated and returned to manufacturing.

How long do solar panels last?

The Energy Saving Trust says solar panels should last 25 years or more. Output falls slowly over time, with research from the US National Renewable Energy Laboratory finding a median degradation rate of around 0.5% per year for crystalline silicon modules.

What WEEE category are solar panels?

Photovoltaic panels are Category 14 under the UK WEEE Regulations. GOV.UK guidance says they are reported as household WEEE wherever they are installed, including on commercial roofs and solar farms.

Can solar panels go in a skip or to landfill?

No. Solar panels are electrical waste and must go to a treatment facility that can recycle them. Many contain lead solder, and thin film panels can contain cadmium compounds.

How long do solar inverters last?

The Energy Saving Trust says an inverter needs replacing after around 12 years, so most systems need at least one inverter replacement during the life of the panels.

How Waste Experts handles solar panel recycling

Waste Experts collects and recycles solar panels from anywhere in the UK, including monocrystalline, polycrystalline and thin film panels. Through our partnership with ROSI, panels go to a dedicated facility where advanced processing separates the silicon, silver and glass, and we recover up to 95% of panel materials. We also collect the inverters, cabling and battery storage that come with a system, with lithium-ion units moved under ADR-compliant transport in fire-safe containers.

Every collection comes with the Duty of Care documentation you need. Find out more about our solar panel recycling service.

Business customers only. Waste Experts collects from businesses and organisations, not households, and CEF branch drop-off is for business waste only. If you are getting rid of waste from your home, use your council's household waste recycling centre or a retailer take-back scheme instead.