A “25-year warranty” sticker is not a promise that nothing will break and everything is free forever. In Australian rooftop solar, product, performance and workmanship warranties cover different failure modes — and claims live or die on paperwork, serial numbers and who still answers the phone in year seven. This 2026 guide unpacks what each warranty type actually covers, how inverter and battery fine print differs from panel marketing, what to archive on install day, and how to compare CEC-accredited quotes without falling for fake ratings or empty “lifetime guarantee” slogans.
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Indicative 2026 pricing: a typical 6.6kW system often quotes around $5,000–$8,000 after the STC discount (metro installs often $5,000–$7,500; premium/regional can run higher). See our solar cost guide.
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Product (materials/workmanship of the module) covers manufacturing defects. Performance warranties guarantee a degradation curve — for example a minimum percentage of rated output after 25 years under defined test conditions. Read exclusions: improper install, unapproved hardware, storm damage pathways, and transport mishandling. A performance warranty is not a guarantee of your bill savings; irradiance and self-consumption still rule the meter.
Inverters commonly carry 5–10 years of cover, sometimes with paid extensions. They fail more often than modules and are the system brain — export settings, battery control and monitoring all sit here. Local service capability and spare parts matter more than a glossy European logo with no AU technicians. Confirm whether labour to swap a failed inverter is included or installer-billable after year one.
Labour warranties from quality CEC-accredited firms often run five years or more and cover mounting, penetrations, cabling and related workmanship. Ask who inherits the obligation if the company is sold or closes — Australian Consumer Law helps, but a live service desk is faster than a tribunal. Roof leaks after solar are classic dispute territory; photo documentation of flashings and torque settings on install day is cheap insurance.
Battery cover usually combines calendar years with cycle or energy-throughput limits — whichever comes first. Usable capacity and depth-of-discharge rules matter more than a headline “10-year” badge. Keep firmware update records and VPP enrolment terms; excess cycling outside manufacturer rules can complicate claims. Confirm whether the federal Cheaper Home Batteries discount pathway affects any warranty registration steps.
Store invoices, CEC accreditation details, panel/inverter/battery serial photos, commissioning sheets, DNSP approval, roof plan and the exact warranty PDFs current on install day. Cloud plus offline copy. Without paperwork, even generous manufacturer policies turn into slow arguments. MrSolar customers should keep every comparable quote PDF too — scope disputes often reference what was sold.
Manufacturer and installer warranties sit alongside Australian Consumer Law guarantees for acceptable quality and fitness for purpose. ACL is not a substitute for buying supportable brands and accredited installers, but it is a backstop when marketing oversells. Document defects early; do not wait until year six to mention a problem you noticed in month two.
Prefer well-supported modules, inverters and batteries with clear AU claim pathways over obscure brands offering theatrical year counts. Ignore fabricated AggregateRating-style scorecards and “#1 in Australia” badges with no methodology. Compare workmanship terms and service response processes across three CEC-accredited quotes — not just panel wattage.
Ask each installer to table product, performance, inverter, battery and labour warranty lengths, what voids them, and who you call first. Align scopes so you are not comparing a 10-year inverter extension on one quote with bare minimum cover on another. Choose the risk profile you can live with when something fails on a Tuesday in 2032.
Compare warranty terms properly — request free CEC-accredited solar quotes on MrSolar.
Written and reviewed by Daniel (Marketplace lead, Epic Unicorn Pty Ltd). We build pages from Australian solar datasets and regulatory references, then map you to CEC-accredited installers only.
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