A solar installation carries at least three distinct warranties — performance, product and workmanship — each covering a different risk, issued by a different party, and often running for a different length of time. "25-year warranty" is marketing shorthand that gets used for all of them, which is where most confusion (and most disappointment when something goes wrong) comes from. Here's what each actually guarantees, in specific technical terms.
<div class="tldr" style="border:1px solid #cbd5e1;background:#f8fafc;padding:16px 20px;border-radius:8px;margin:24px 0;"> <strong>Quick answer</strong> <ul> <li><strong>Performance warranty (25–30yr):</strong> guarantees minimum output % over time. Manufacturer.</li> <li><strong>Product warranty (12–25yr):</strong> covers manufacturing defects — delamination, frame, junction box. Manufacturer.</li> <li><strong>Workmanship warranty (5–10yr):</strong> covers the installation — mounting, wiring, waterproofing. Installer.</li> <li>Inverters carry their own separate warranty (typically 5–12yr).</li> <li>A short product warranty behind a long performance warranty is a red flag.</li> </ul> </div>
<div style="overflow-x:auto;"> <table style="border-collapse:collapse;width:100%;min-width:600px;"> <thead><tr style="background:#eef2f7;"> <th style="border:1px solid #cbd5e1;padding:8px;text-align:left;">Warranty type</th> <th style="border:1px solid #cbd5e1;padding:8px;text-align:left;">Typical term</th> <th style="border:1px solid #cbd5e1;padding:8px;text-align:left;">What it covers</th> <th style="border:1px solid #cbd5e1;padding:8px;text-align:left;">Issued by</th> </tr></thead> <tbody> <tr><td style="border:1px solid #cbd5e1;padding:8px;">Performance</td><td style="border:1px solid #cbd5e1;padding:8px;">25–30 years</td><td style="border:1px solid #cbd5e1;padding:8px;">Minimum output % over time</td><td style="border:1px solid #cbd5e1;padding:8px;">Panel manufacturer</td></tr> <tr><td style="border:1px solid #cbd5e1;padding:8px;">Product</td><td style="border:1px solid #cbd5e1;padding:8px;">12–25 years</td><td style="border:1px solid #cbd5e1;padding:8px;">Manufacturing defects</td><td style="border:1px solid #cbd5e1;padding:8px;">Panel manufacturer</td></tr> <tr><td style="border:1px solid #cbd5e1;padding:8px;">Workmanship</td><td style="border:1px solid #cbd5e1;padding:8px;">5–10 years (sometimes longer)</td><td style="border:1px solid #cbd5e1;padding:8px;">Installation quality</td><td style="border:1px solid #cbd5e1;padding:8px;">Installing company</td></tr> <tr><td style="border:1px solid #cbd5e1;padding:8px;">Inverter (separate)</td><td style="border:1px solid #cbd5e1;padding:8px;">5–12 years (often extendable)</td><td style="border:1px solid #cbd5e1;padding:8px;">Inverter faults</td><td style="border:1px solid #cbd5e1;padding:8px;">Inverter manufacturer</td></tr> </tbody> </table> </div>
The performance warranty guarantees a minimum energy output, expressed as a percentage of the panel's original rated capacity, at specific points across its term — typically 25 to 30 years on current premium panels. It does not promise the panel will keep physically functioning; it promises that if it's functioning, it will produce at least a specified minimum percentage of its original rating.
A representative premium panel performance warranty today:
Some manufacturers now offer 30-year performance warranties with a slightly more generous degradation curve, reflecting improvements in cell and encapsulant technology (particularly newer TOPCon and N-type cell designs, which generally degrade more slowly than older PERC panels — see Solar Panel Degradation Explained).
If independent testing shows a panel is producing below its warranted curve for its age, the manufacturer is obligated to repair, replace or provide a proportional remedy. In practice this requires documented underperformance, usually verified through inverter monitoring or on-site testing, and it's a claim against the panel manufacturer, not your installer.
The product warranty (sometimes called a "materials and workmanship warranty" by the manufacturer — a separate thing from the installer's workmanship warranty) covers manufacturing defects in the physical panel: delamination, frame corrosion or failure, junction box faults, glass cracking not caused by external impact, and internal circuit failures not attributable to installation error or physical damage.
Product warranties on premium panels commonly run 12 to 25 years, though the term varies meaningfully by manufacturer and tier — budget ranges often carry noticeably shorter product warranties (sometimes as little as 10–12 years) even where the performance warranty looks similar on paper.
Why the gap matters: a panel could have an excellent 30-year performance warranty but only a 12-year product warranty. A manufacturing defect that causes the panel to fail entirely at year 15 may not be covered — the performance warranty is irrelevant if the panel has stopped functioning and the product warranty term has already lapsed. This gap is one of the most important, and most overlooked, things to check when comparing panels that otherwise look similar.
This is entirely separate from anything the panel manufacturer offers — it's issued by the installing company and covers the quality of the installation itself: mounting and racking integrity, roof-penetration waterproofing, DC and AC wiring, cable management, and correct system commissioning.
Workmanship warranties commonly run 5 to 10 years in the Australian market, though some installers — particularly established, premium operators — offer longer terms as a point of differentiation. This warranty is only as good as the installing company's ongoing existence and reputation: a longer workmanship warranty from a company with years of established local trading history is a materially different proposition to the same headline term from a newly formed entity.
Inverters carry their own manufacturer warranty, entirely independent of the panel warranties, typically ranging from 5 to 12 years depending on brand and model (often extendable at additional cost). Because inverters are electronic components statistically more likely to require replacement within a system's lifetime than the panels themselves, checking inverter warranty length and extension options is just as important as checking panel warranty terms.
No. It usually refers to the performance warranty (output percentage). The product warranty covering physical defects and the installer's workmanship warranty are often shorter, so check all three.
The product warranty covers manufacturing defects that cause failure. If it has lapsed, a strong performance warranty won't help — which is why a short product warranty behind a long performance warranty is a red flag.
Want a warranty comparison across the panel and battery brands available in today's range? Get a detailed, transparent quote from Blue Energy Solar, or call 0421 458 217.
