The short answer: choose a solar installer on trading history and accreditation first, and on price second, because the biggest risk in an Australian install is not the panel brand, it is whether the company is still around when a panel or inverter fails. The core warning is simple. A 10 to 25 year warranty is worthless paper if the business that issued it has gone under, and a lot of them have.
That last point is not scaremongering. It is the single most expensive mistake households make, and it never shows up on the quote.
The risk the brochure never mentions
More than 700 Australian solar retailers have exited the market since 2011. By some estimates, roughly one installed system in six now carries a warranty against a company that no longer trades. In practice that looks like this: three years in, your inverter dies, you ring the number on the invoice, and it is disconnected. The manufacturer points you back to the installer who owns the workmanship guarantee, and the installer is gone. You are now paying out of pocket to fix a system that is, technically, still under warranty.
This is why panel brand, the thing most buyers obsess over, is well down the list. Modern tier-one panels are broadly comparable and rarely the point of failure. The point of failure is the relationship: who stands behind the install, and will they pick up the phone in 2031. These figures were last checked June 2026.
What a good installer actually looks like
You are not really buying panels. You are buying a decade-long service relationship with a company you hope outlives the warranty. Here is the vetting checklist, in the order that protects your money.
- Years of continuous trading. Favour a business with 5 to 7 years or more of unbroken trading under the same entity. A company that has survived two or three solar downturns is a far better bet than the cheapest quote from an outfit incorporated last year.
- A verifiable company structure. Look the business up on the ASIC register by its ABN or ACN. You want a real, registered company with a traceable history, not a brand name that changes every time the complaints pile up.
- The accredited installer does the actual install. The person on your roof should hold current SAA or CEC accreditation (the industry body that accredits installers). A salesperson is not an installer. Ask who physically does the work and confirm their accreditation number.
- In-house labour, not subcontracted. Crews on the company’s own books tend to mean accountability that survives the job. Heavily subcontracted labour can mean nobody clearly owns the workmanship when something goes wrong two years later.
- A written, itemised quote. It should separately list the STC rebate on the panels and, if you are adding storage, the battery rebate, applied as upfront discounts. A quote that buries the rebate inside one round number is hiding something.
- Compliance sign-off in writing. Demand the paperwork. More on exactly which documents below.
- Reviews that mention after-sales service. Five stars on installation day is easy. The reviews that matter are the ones describing what happened when the customer called back a year later with a fault.
Pick the installer who will still answer the phone when your inverter fails in year seven, not the one who is fifty dollars cheaper in week one. The warranty is only ever as good as the company standing behind it.
The compliance sign-offs to demand
This is the part most buyers skip, and it is exactly the part that protects you legally and practically. A compliant residential solar install in Australia should leave you holding clear documentation against the relevant standards. Do not accept a system as finished without it.
| Sign-off | What it covers | Why you want it |
|---|---|---|
| Certificate of Electrical Compliance | The electrical work was done and tested to standard | Your proof the install is legal and safe; often needed for insurance and rebate claims |
| AS/NZS 3000 | The general wiring rules for the whole electrical job | The baseline every electrical connection in the system must meet |
| AS/NZS 4777 | Grid-connected inverter installation | Confirms the inverter is wired and configured to feed the grid safely |
| Accredited installer details | The SAA or CEC number of the person who installed it | Ties the rebate and the workmanship warranty to a real, accredited individual |
If an installer cannot or will not hand over a Certificate of Electrical Compliance and name the accredited person who did the work, that is not a paperwork hiccup. It is a reason to walk. These documents are also what you will reach for to claim on the warranty, sell the house, or satisfy an insurer, so file them somewhere you will find them in a decade.
The red flags that should end the conversation
Some warning signs are subtle. These are not. Any one of them is grounds to politely close the door.
- Door-knocking. Reputable installers are not cold-calling your street at dinnertime. The business model of the door-knock is pressure, not service.
- “Today only” discounts. A genuine price does not evaporate at midnight. The high-pressure, sign-tonight close exists to stop you doing exactly the vetting in this article.
- A deposit demand with no documentation. If they want money before you have a written, itemised quote and a clear scope, you are funding their cash flow, not your system.
- A quote that hides the rebate. If the STC discount is not itemised, you cannot tell whether you are getting the rebate value or the company is quietly pocketing it.
None of these are about rudeness or sales energy. They are about whether the business is structured to be there when you need it, or structured to close the sale and move on.
Where the price actually matters
To be clear, price is not irrelevant. It is just the second question, not the first. Once you have a shortlist of installers who clear the longevity, accreditation, and compliance bars, compare quotes hard. The mistake is starting with the cheapest number, because it is often cheap precisely because the company cuts the corners that cost you later.
One useful shortcut is to let a platform do the first filter. Services such as Why Solar pre-vet installers on exactly the criteria that matter here, trading history and accreditation, before you ever take a call, which narrows the field to operators likely to outlast the warranty. From there you are comparing vetted quotes rather than gambling on whoever knocked first.
It also pays to know the numbers before anyone quotes you. Our guides to how much a solar battery costs and what panels actually cost in 2026 give you the ranges to sanity-check any quote, so you can tell a sharp price from a suspiciously cheap one.
The bottom line
In Australia in 2026, the panel brand is rarely what makes or breaks a solar install. The installer is. Vet for longevity first: 5 to 7 years or more of continuous trading, a verifiable ASIC-registered company, and SAA or CEC accredited people doing the actual work rather than a salesperson who hands the job to a subcontractor. Demand the compliance paperwork, the Certificate of Electrical Compliance, AS/NZS 3000 and AS/NZS 4777 sign-offs, and a written quote that itemises the rebate. Walk away from door-knockers, “today only” discounts, and any deposit demand with no documentation behind it.
The cheapest quote and the safest quote are rarely the same document. With more than 700 retailers already gone and one system in six orphaned, the durable installer is not a nice-to-have. It is the entire warranty.