Solar Panel Warranties in Australia: What's Covered

Most people compare solar quotes on price and panel brand. Warranties get a quick glance — "25 years, great" — and that's it.

That's a mistake. A solar system is a 20-plus year purchase with several separate warranties layered on top of each other, and they cover very different things. Understanding the difference is the single easiest way to avoid an expensive surprise in year seven.

Here's what each warranty actually does, who you claim from, and the practical steps that keep your cover intact.

The four warranties on every solar system

When an installer says the system is "fully warranted," they're bundling at least four separate promises from three or four different companies. Ask which is which.

Warranty type	What it covers	Who honours it
Panel product warranty	Manufacturing faults, defective materials, delamination, frame failure	Panel manufacturer (via your installer)
Panel performance warranty	Guaranteed minimum output as panels age	Panel manufacturer
Inverter warranty	Failure of the inverter or its components	Inverter manufacturer
Workmanship / installation warranty	Mounting, wiring, roof penetrations, labour quality	Your installer

They're independent. A world-class panel with a long product warranty means nothing if the racking was fitted badly and water is tracking into your roof cavity — that's a workmanship issue, and the panel manufacturer won't touch it.

Product warranty vs performance warranty

This is the distinction that trips up the most homeowners.

The product warranty covers the panel physically failing or being defective. Cracked backsheet, corroded frame, junction box failure, water ingress. If the panel is faulty, it gets replaced or repaired.

The performance warranty covers gradual output decline. Solar panels lose a small amount of output every year — that's normal and expected. The manufacturer guarantees the panel will still produce at least a certain percentage of its rated output at set milestones. If it drops below that curve, you have a claim.

Historically, product warranties were much shorter than performance warranties, which is where the confusion started. Plenty of homeowners assumed "25 years" applied to everything. In practice, quality manufacturers have been extending product cover, and on premium panels the two periods are now often closer together — but you should never assume. Ask for the actual numbers on the exact model you're being quoted.

What a performance claim actually looks like

Performance claims are rare and hard to prove. To show a panel is underperforming, you need to isolate it from shading, soiling, inverter issues, string faults and weather — then measure it against its rating under standard test conditions.

That usually requires a technician with test equipment, and the cost of that testing may or may not be covered. It's worth asking who pays for diagnosis if a claim turns out to be valid.

In the real world, most claims are product or inverter claims, not performance claims.

The inverter is the part most likely to need attention

Panels have no moving parts and sit there quietly for decades. Inverters do the hard work — converting DC to AC, managing voltage, running electronics that get hot every single day.

Standard inverter warranty periods are typically shorter than panel warranties. Many manufacturers offer paid extensions, and on some brands that extension is genuinely worth considering, because if the inverter fails outside warranty you're paying for a replacement unit plus labour.

A few things to check before you commit:

• Is the manufacturer supported in Australia? A local office, local spare parts and a local service network matter far more than the number of years printed on the certificate. A 12-year warranty from a company with no Australian presence is a phone call to nowhere.
• Is it replacement or repair? Some brands ship a replacement unit quickly; others require the faulty unit to be returned and assessed first, which can mean weeks without generation.
• Who pays for labour? Manufacturer warranties often cover the part, not the electrician's time to swap it out. Your installer's workmanship warranty may or may not fill that gap.
• Are there conditions on the install location? Inverters mounted in direct sun or in poorly ventilated spaces can run hot and shorten their life. Some warranty terms reference installation conditions.

Ask your installer directly: if this inverter fails in year six, what do I pay? A good answer is specific. A vague one is a warning.

Workmanship warranty: the one that protects your house

This is the warranty homeowners underrate the most, and it's the one most likely to matter.

Your installer's workmanship warranty covers the physical installation — the mounting rails, the roof penetrations and flashing, the cable runs, the isolators, the switchboard work. If a bracket works loose in a storm, if water gets in around a roof fixing, if a DC cable was run without proper protection, that's on the installer.

Under the rules that apply to accredited installations in Australia, installers are required to provide a minimum workmanship warranty period. Some offer longer. But the length of the warranty is only half the story — the other half is whether the business will still exist to honour it.

Solar has a long history of companies appearing, selling hard on price, and disappearing. If the installing company folds, the manufacturer warranties on the panels and inverter usually survive (you claim through another accredited installer or the manufacturer's Australian arm), but the workmanship warranty typically goes with them.

Signs of a business likely to still be around:

• Trading for several years under the same ABN, not a recently registered entity
• A physical office or warehouse, not just a call centre
• SAA-accredited installers doing the actual work, not subcontracted labour rotating through
• Willing to put the warranty terms in writing before you pay a deposit
• Reviews that mention service after installation, not just the sales process

Australian Consumer Law sits underneath everything

Whatever the paperwork says, Australian Consumer Law provides guarantees that can't be contracted away. Goods must be of acceptable quality and fit for purpose, and services must be carried out with due care and skill.

What "acceptable quality" means for a solar system depends on what a reasonable consumer would expect given the price paid and the claims made at the point of sale. In practice, a system marketed as a 25-year investment failing after five years is a strong ACL position even if a written warranty has lapsed.

This is a genuine safety net, but it's not a substitute for buying well in the first place. ACL claims take time and effort. A solid installer who answers the phone is faster.

How to keep your warranty valid

Warranties get voided more often through paperwork and neglect than through anything dramatic. Protect yours:

Keep every document. Your invoice, the system design, the panel and inverter model numbers and serial numbers, the compliance certificate, and any commissioning report. Store them digitally somewhere you'll still find them in a decade — not in a kitchen drawer.

Register the products. Some manufacturers require online registration within a set window after installation to activate the full warranty period. Your installer may do this for you; confirm that they have.

Don't let unaccredited people touch it. Roof work, tiling, painting, air conditioning installs and antenna work all put tradies near your array. If someone unqualified disconnects, moves or reconnects part of the system, you can compromise cover. Have solar work done by an accredited installer.

Do the maintenance the manual asks for. Most systems need very little, but some manufacturers specify periodic inspection intervals. Ignoring them entirely gives an insurer or manufacturer a reason to push back.

Watch your output. If you never check the monitoring, a failed panel string or a derated inverter can sit unnoticed for a year. Spotting a problem early makes it a warranty claim; spotting it late makes it an argument.

Note any changes to the property. New shading from a growing tree or a neighbour's extension isn't a warranty issue, but it will change your output — and you want to know that's the cause before you start a claim.

Reading a quote properly

When you compare quotes, put the warranty details side by side rather than accepting the summary line on the front page. Ask each installer for:

• Panel make, model, product warranty years and performance warranty terms
• Inverter make, model, standard warranty years and the cost of any extension
• Workmanship warranty length, in writing, and exactly what it covers
• Whether labour and call-out fees are included on manufacturer warranty claims
• Who to contact for a claim — the installer, an Australian distributor, or an overseas head office

If a quote is noticeably cheaper than the others, the difference is often hiding here: shorter cover, a brand with no local support, or a workmanship warranty from a business with no track record.

Frequently asked questions

Does my solar warranty transfer if I sell the house?

Usually yes for manufacturer product warranties, which generally attach to the equipment rather than the owner. Workmanship warranties vary by installer — some transfer, some don't. If you're selling, having the documentation ready is a genuine selling point; if you're buying a home with existing solar, ask for it.

Does hail or storm damage fall under warranty?

No. Warranties cover defects, not external damage. Hail, fallen branches, fire and flood are insurance matters. Check that your home and contents policy explicitly covers the solar system and that the sum insured reflects replacement cost — some policies treat it as a separate item.

What happens if the panel manufacturer goes out of business?

The warranty is only as strong as the company behind it. If the manufacturer disappears, the written warranty may be unenforceable, though Australian Consumer Law obligations can still fall on the supplier who sold you the goods. This is the practical argument for choosing established brands with a real Australian presence over the cheapest option on paper.

Do batteries have the same warranty structure?

Similar, but with an extra measure. Battery warranties are usually expressed in years and in either total energy throughput or cycles, whichever comes first, along with a guaranteed remaining capacity at end of term. If you're adding storage, ask how the retained-capacity guarantee is worded — it's the number that matters most.

Getting this right from the start

The best warranty is the one you never have to use, and the way you get there is choosing quality equipment installed properly by a business that will still be trading in ten years.

That's harder to judge from a website than from a real conversation. Comparing several quotes from SAA-accredited installers lets you see how each one answers the awkward questions — who pays for labour, what's in writing, how long they've been trading.

Get your free solar quote and compare warranty terms alongside price, not after it.