Solar panel warranties explained: what Perth buyers actually need to know

Every solar panel sold in Perth comes with two separate warranties that cover different things, last different periods, and are backed by different entities. The short answer: you need a product warranty of at least 10–15 years and a performance guarantee of 25 years, and both are only as good as the manufacturer standing behind them.

Read both before you sign. That's what protects you if a panel underperforms or fails years down the track.

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The two solar panel warranties

Product warranty (materials and workmanship)

What it covers: Physical defects in the panel itself: delamination, cell cracking from a manufacturing fault, junction box failure, frame corrosion. The panel was built incorrectly or failed prematurely due to a manufacturing defect.

What it does not cover: Physical damage from impact (hail, falling branches), damage from improper installation, normal degradation over time.

Typical duration: 10–15 years for mainstream panels; some premium brands offer 25 years. CEC manufacturer profiles show that brands like Jinko and JA Solar typically carry 12-year product warranties, while REC, Trina, LONGi, Canadian Solar, and Risen offer 25-year product warranties. Q CELLS also published a 25-year product warranty, but has since exited the Australian market. See the manufacturer-exit risk below before treating that figure as currently claimable.

Who backs it: The manufacturer. If the manufacturer ceases operations, the product warranty becomes unenforceable. You have no one to claim against.

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Performance guarantee (power output)

What it covers: A guarantee that the panel will produce at least a specified percentage of its rated power after a given number of years. The guarantee is that degradation won't exceed certain rates.

Typical terms:

• End of year 1: at least 97–98% of rated power (covers initial light-induced degradation; typical, varies by brand)
• End of year 10: about 90% or better
• End of year 25: about 80% or better; specific end-points vary by brand and model, for example REC Alpha guarantees 92% at year 25 and Canadian Solar's Australian KU warranty 84.8% at year 25. Check the datasheet for your panel

Standard panels degrade at roughly ~0.5%/year on average.

Back-contact cell designs like SunPower / Maxeon IBC tighten that to approximately ~0.25%/year.

What "80% at 25 years" actually means:

Buy a 400W panel with a standard performance guarantee:

• After 25 years, it must still produce at least 320W (80% of 400W)
• If it produces 295W at year 20 and your monitoring confirms this, you have a performance warranty claim

Who backs it: The manufacturer. Same caveat as the product warranty: a manufacturer that doesn't exist in 25 years can't pay a claim.

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Making a performance warranty claim

Performance warranty claims are rare but procedurally demanding. You'll need:

1. Evidence of underperformance: monitoring data showing output, ideally with irradiance data to confirm test conditions, or an independent PV technician's report
2. Panel serial numbers and model
3. Proof of purchase and installation date
4. Written claim to the manufacturer's Australian agent or direct to the manufacturer

Practical obstacles:

Proving underperformance means eliminating other causes first: soiling, shading, inverter issues, wiring degradation. Most manufacturers require the claim to go through the original installer or an authorised service partner. A successful claim typically results in replacement panels, not cash.

The Australian Consumer Law safety net: The ACL provides a consumer guarantee (independent of the product warranty) that goods will last for a reasonable period. For a product marketed as lasting 25 years, the ACL gives you a legal avenue if the manufacturer or installer is unresponsive, even where the written warranty has expired.

For a step-by-step look at the claims process, see how to make a solar warranty claim in Perth.

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What happens when a manufacturer exits Australia

This is the most practically relevant risk for Perth buyers. It's not theoretical.

Some panel brands have exited the Australian or global solar market in recent years, ending local production and direct support. Panels from those manufacturers no longer have an active Australian service network behind them. Warranty claims against an exited manufacturer are more complex than claiming against one with ongoing local operations.

Two things follow from this:

• A 25-year product warranty from a manufacturer with no Australian presence may be unenforceable in practice, even if the warranty document is legally valid
• Favour manufacturers with established Australian operations, local service networks, and a track record of at least five years in the Australian market

The CEC maintains manufacturer data including Australian entry dates and local office locations. That's what's worth checking when comparing quotes.

Ask your installer:

• Who is the Australian distributor for this panel brand?
• Does the manufacturer have a local service centre or warranty agent in WA?
• Has the manufacturer been in the Australian market for at least five years?

For a broader look at what to check on installer credentials, see checking solar installer credentials in Perth.

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Inverter warranty: a separate note

Your inverter has its own product warranty, and it matters a lot for long-term planning:

Extended inverter warranties of 10 years are often available for purchase at the time of installation.

Inverters are more likely to need replacement within a system's 25-year life than panels. The inverter is the most sophisticated component in the system, and the one most likely to fail first. Plan for one replacement around year 10–15. As an indicative figure only, hardware for a 5 kW unit has been reported around $900–$2,300; installation is additional, and no authoritative WA all-in replacement cost is currently available.

For more detail on the enphase-vs-solaredge decision, see Enphase vs SolarEdge inverters in Perth.

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What to check before signing your solar contract

• Product warranty duration: 10 years minimum; 15–25 years preferred
• Performance guarantee duration: 25 years minimum, end-point percentage of 80% or better
• Manufacturer's Australian presence: distributor name, Australian contact
• Whether an extended inverter warranty is included or available to add
• Who handles warranty claims: your installer, an agent, or direct to the manufacturer
• What the claims process looks like in writing (ask the installer to spell it out)

The solar buying checklist for Perth homeowners covers these questions alongside system sizing, installer vetting, and contract review.

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What makes a solar warranty worth the paper it's on

Two panels can carry the same 25-year performance guarantee and be very different propositions. The difference comes down to three things:

• Australian presence: a local service centre or distributor makes a claim far more tractable
• Degradation end-points: actual brand-specific percentages vary; check the datasheet, not just the headline years
• Track record: how long the manufacturer has been operating in Australia, and whether they have a history of honouring claims

A warranty is a legal commitment, but collecting on it requires the other party to exist and be reachable. That's the practical filter when comparing panel brands.

For a broader look at how panel quality affects long-term output, see solar panel degradation rates in Perth.

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Warranty terms vary by manufacturer and model. Verify specific warranty terms in the panel datasheet before signing. Australian Consumer Law rights exist independently of manufacturer warranties. Consult a consumer rights body if you encounter warranty disputes.