Quick answer: The single biggest variable in how your solar system performs over 25 years is who installs it — so vet the installer harder than the panel: confirm the on-roof person is Clean Energy Council (CEC) accredited, insist on an in-home assessment, and get all three warranties in writing before signing.
Panel and inverter choice matters, but the single biggest variable in how your solar system actually performs over 25 years is who installs it. A mediocre panel installed correctly by a competent, accountable team will outperform a great panel installed poorly. This guide covers how to actually vet an installer, not just where to find one.
Any installer working on your system needs to be Clean Energy Council (CEC) accredited. This isn't a nice-to-have credential — it's a legal requirement for STC eligibility, and installing without it can void your rebate and, more importantly, your safety compliance. Beyond the base requirement, check:
Ask directly, by name, for the accreditation number of whoever will be on your roof. A legitimate installer will provide this without hesitation.
This is one of the clearest signals of installer quality, and it's worth treating as close to a dealbreaker.
A phone-only or "quote from a satellite photo" quote cannot properly account for your roof's actual condition, shading from specific trees at specific times of day, roof structural adequacy, switchboard capacity, meter box location, cable run distance, or any of the dozen site-specific factors that determine both the right system design and the accurate price. These quotes are optimised for speed and a low headline number — and are where scope creep, unexpected "extra costs" on install day, and mis-sized systems most commonly originate.
A genuine in-home assessment involves someone physically inspecting your roof space, switchboard, meter box and relevant obstructions before finalising a design and firm price. It takes longer to arrange, but it's the difference between a quote based on your actual house and a quote based on an assumption.
| Signal | Phone-only quote | In-home assessment |
|---|---|---|
| Roof condition assessed | No | Yes |
| Shading assessed at multiple times of day | Rarely | Usually |
| Switchboard/meter box capacity checked | No | Yes |
| Final price likely to change on install day | Higher risk | Lower risk |
| System design specific to your roof | Often templated | Genuinely customised |
Star ratings alone are close to useless in this industry — a company can have hundreds of 5-star reviews from the sales/install experience and still have serious problems with post-install support, which is where most solar complaints actually originate. When checking reviews:
Ask for three separate warranty terms in writing: the panel product warranty, the panel performance warranty, and the installer's own workmanship warranty (typically 5–10 years for quality installers, covering the physical installation itself — mounting, wiring, weatherproofing — separate from the equipment manufacturer warranties). See our full Solar Panel Warranty Guide for what each of these actually covers.
A proper quote should specify: exact panel brand/model/quantity, exact inverter brand/model, mounting system, estimated annual generation for your specific roof, all warranty terms, STC value assumed and how it's applied, and a firm total price with no vague "plus extras" clause.
Confirm the installer carries public liability insurance and that the individual installer's licence is current — both are checkable via public registers.
The best-performing solar systems we see aren't necessarily the ones with the most expensive panels — they're the ones installed by a team that took the time to properly assess the property, specified equipment honestly in writing, and is still around and contactable years later if something needs attention.
Yes. Clean Energy Council accreditation is a legal requirement for STC (rebate) eligibility, and it underpins your safety compliance. Ask by name for the accreditation number of the person who will physically be on your roof — not just proof that the company holds a licence.
Treat it as close to a dealbreaker. A phone or satellite-photo quote can't account for roof condition, shading, switchboard capacity or cable runs, so it's where mis-sized systems and surprise "extra costs" on install day most often originate. Insist on a genuine in-home assessment.
Read the 2- and 3-star reviews rather than just the 1- and 5-star extremes, since they tend to be the most specific. Search the company name alongside "warranty claim" or "not responding", and check how long the business has been trading — post-install support is where most complaints arise.
A workmanship warranty is only worth anything if the installer still exists and is contactable when you need to claim. Many Australian homeowners hold a valid manufacturer warranty but have no local installer left to action a workmanship claim because the original business closed.
Weighing up quotes? For a genuine in-home assessment rather than a phone-only quote, you can book with a Sydney-based team at blueenergysolar.com.au, or call 0421 458 217 / email sales@blueenergysolar.com.au.
