What happens to solar panels at end of life? Recycling, replacement, and planning ahead

Solar panels installed during Perth's first major boom (2010–2014) are now 12–16 years old. They're almost certainly still operating, but they're past half their warranted lifetime. Here's what "end of life" actually means for solar panels — and what owners of older systems should be thinking about.

What does end of life mean for a solar panel?

Solar panels don't suddenly stop working. They degrade gradually — typically losing 0.3–0.5% of output per year. A panel installed in 2012 that was rated at 250W is likely generating approximately 237–243W in 2026 — a loss of approximately 3–5% from its original specification.

Industry performance guarantees (standard): Most panels carry a 25-year performance guarantee stating the panel will produce at least 80% of its rated output at year 25.

Better panels (premium warranties): HJT and high-efficiency panels often carry guarantees of 90–92% at year 25.

At the end of a 25-year warranty period, the panel isn't broken — it's just no longer guaranteed. A well-made panel installed in 2012 running at 75% of its 2012 output in 2037 is still generating meaningful electricity.

Practical end-of-life trigger: Panels typically stop being economically worth maintaining when the cost of cleaning, inspection, or a mounting system repair exceeds the value of the electricity they generate. At 75–80% output on a low-cost system, that point may not arrive until year 35+.

Panel composition and recyclability

Understanding what panels are made of helps explain the recycling challenge:

| Component | Material | Recyclability | |---|---|---| | Frame | Aluminium | High — easily recycled | | Backsheet / glass | Tempered glass (90% by weight) | Moderately recyclable but mixed with laminate | | Solar cells | Silicon | High value, technically recyclable but process-intensive | | Encapsulant | EVA plastic | Low — laminated, hard to separate | | Busbars | Silver (small amount) | Valuable, worth recovering | | Junction box | Copper, plastic | Partially recyclable |

The challenge is that the silicon cells and glass are laminated together with EVA plastic. Separating them to recover the silicon and glass requires either thermal treatment (high energy) or mechanical separation (leaves impure material). Current recycling technology recovers approximately 80–90% of the glass and aluminium but less than 50% of the silicon value.

The APVA solar panel stewardship scheme

The Australian PV Institute has been working on a voluntary product stewardship scheme (the Australian Solar Panel Stewardship Scheme) that would create a recycling infrastructure and potentially a levy on new panel sales to fund end-of-life processing.

Current status (2026): The scheme is in development. No mandatory take-back obligation currently exists in Australia. Panels going to landfill is technically legal in WA (unlike in the EU, which has mandatory WEEE recycling).

Recyclers operating in Australia: A small number of specialist recyclers (including in WA) accept solar panels for processing. Costs vary — some charge a per-panel fee ($10–$30), others may accept clean panels for free if they can recover the aluminium and silver value.

What to do with old panels: Contact your installer or a WA e-waste recycler when you replace panels. Don't dispose in standard waste streams.

Inverter vs panel timing

The most common reason Perth homeowners will replace a solar system within 25 years is an inverter failure, not panel degradation.

• Panels: 25–35 year lifespan, gradual degradation
• String inverters: 10–15 year lifespan, typically replaced once during the panel's life
• Microinverters: 20–25 year warranted lifespan (Enphase 25yr warranty)

When an inverter fails on a 12-year-old system, the decision is:

1. Like-for-like replacement (same capacity, string inverter): $1,500–$2,500
2. Upgrade to larger hybrid inverter: $3,000–$4,500 (enables battery)
3. Full system replacement (new panels + new inverter): $5,000–$8,000

Option 3 is rarely the right call unless the panels themselves are underperforming significantly. Most 12-year-old panels from established brands are still worth keeping.

Planning for generation decline over 25 years

A system generating 9,500 kWh/year in 2026 will generate approximately:

• 2031 (year 5): 9,300 kWh (98% output)
• 2036 (year 10): 9,100 kWh (96% output)
• 2041 (year 15): 8,900 kWh (94% output)
• 2046 (year 20): 8,700 kWh (92% output)
• 2051 (year 25): 8,500 kWh (89% output)

At the same time, electricity prices are likely to continue rising, which means each kWh generated is worth more in dollar terms. The combination of modest generation decline and price inflation typically means the absolute dollar value of a Perth solar system continues to increase over 25 years even as physical output slowly declines.

Panel degradation rates based on published industry research and manufacturer warranty specifications. APVA scheme status as of June 2026. Recycling options and costs vary by location in WA.