How to Compare Solar Quotes in Australia (Without Getting Burned)

To compare solar quotes properly, line them up on the same components and the same inclusions, then compare the total installed price, not the headline number. The cheapest quote is rarely the best value once you account for panel and inverter quality, warranty length, and what has been quietly left out. Judge each quote on total cost of ownership over 10 to 25 years, not the price on the first page.

Most people get three quotes, see three different prices, and pick the lowest. That is how you end up paying twice. Here is how to read a solar quote like someone who installs them for a living.

Why do solar quotes vary so much?

Two quotes for the same size system can differ by thousands of dollars, and it is almost never random. The gap usually comes down to the quality of the panels and inverter, the length and type of warranty, and how much of the job is actually included in the price versus added later.

A rock-bottom quote often uses budget components, a shorter workmanship warranty, or a scope that excludes things your roof will genuinely need, like a switchboard upgrade or extra roof rails. A dearer quote might include all of that up front. Same house, same solar target, very different real cost. Your job is to strip each quote back to a like-for-like comparison.

What should a good solar quote include?

Before you compare anything, make sure each quote actually spells out what you are buying. A vague quote is a red flag on its own. A complete quote should clearly state:

• The exact panel brand, model and total system size in kilowatts (kW), plus the number of panels
• The exact inverter brand, model and size, and whether it is a string inverter or microinverters
• If you are adding storage, the exact battery brand, model and usable capacity in kilowatt-hours (kWh)
• The product warranty and performance warranty on the panels, and the inverter warranty
• The installer's workmanship warranty (the labour and installation guarantee)
• Everything included: mounting, cabling, isolators, monitoring, grid connection paperwork and any needed switchboard work
• The total installed price after any incentives, plus what happens if extra work is found on the day

If a quote will not name the exact panel and inverter model in writing, you cannot compare it. Ask for it before you go any further.

How do you compare solar quotes apples-to-apples?

Put the quotes side by side and normalise them so you are comparing the same things. Work through it in this order:

1. Match the system size. A 6.6kW system and a 10kW system are not comparable on price alone. Compare dollars per kW installed once the sizes are close.
2. Match the component tier. Line up panel against panel and inverter against inverter. A premium panel next to a budget one is not a fair fight on price.
3. Match the inclusions. If one quote includes a switchboard upgrade and another does not, add the missing item to the cheaper quote before you compare.
4. Match the warranty. A longer workmanship warranty has real value. Factor it in rather than ignoring it.
5. Then, and only then, compare the total installed price.

Do the same for storage. If you are weighing up a battery, compare usable capacity in kWh and the battery's own warranty, not just the sticker price. Our solar battery page walks through how capacity and backup features change what you are really paying for.

What warranties should you check on a solar quote?

Solar has several separate warranties, and lumping them together is where buyers get caught. Check each one on its own:

• Panel product warranty: covers manufacturing defects in the panels themselves
• Panel performance warranty: guarantees the panels still produce a set percentage of their rated output years down the track
• Inverter warranty: the inverter is the hardest-working part and often the first thing to need replacing, so the term matters
• Workmanship warranty: the installer's guarantee on the labour and the physical install, which is the one that protects you against leaks and faulty wiring

A long product warranty means little if the company installing it will not be around, or if the workmanship warranty is short. Look for a business with a track record and local support, and check the brand has an Australian presence so a claim is not a dead end. It also pays to confirm the installer holds current accreditation and that the panels sit on the approved-products list used for incentives.

What hidden exclusions inflate the real price?

The cheapest quote often wins by leaving costs off the page, then adding them on installation day. Read the fine print for exclusions and ask directly what is not included. Common ones to watch for:

• Switchboard or meter upgrades treated as an extra rather than part of the quote
• Extra charges for a two-storey home, tile roofs, or difficult roof access and scaffolding
• Long cable runs, extra isolators or trenching billed separately
• Monitoring hardware or app setup listed as an optional add-on
• Grid connection or paperwork fees not shown in the headline price

Ask one question of every installer: 'Is there anything that could add to this price on the day, and if so, what?' The answer tells you a lot about how honest the quote is.

How do rebates and finance affect the comparison?

Government incentives and finance options change over time and vary by state, so make sure every quote treats them the same way. One installer might show the price after an incentive has been applied while another shows the price before, which makes a like-for-like comparison impossible until you line them up. Always confirm the current details rather than relying on what a quote assumes. For the latest on what is available and how it is applied, see our rebates and finance page, which we keep up to date.

How many solar quotes should you get?

Three quotes is the sensible minimum, because it gives you a realistic price range and exposes any outlier that is too cheap to be trusted or padded too high. In a high-sun, high-price state like South Australia, getting the system right the first time matters, and a considered comparison beats a rushed decision. If you are in the market, our Adelaide team can put together a fully itemised quote you can hold up against the rest.

Compare on total value over the life of the system, not the number on the front page. Match the components, match the inclusions, weigh the warranties, then let the best genuine value win.

Frequently asked questions

Is the cheapest solar quote ever the right choice?

Sometimes, but only after you have confirmed it is truly like-for-like. If the cheapest quote uses the same quality components, includes the same work, and carries the same warranties as the others, it can be great value. More often it is cheaper because something has been downgraded or left out, so check the detail before you decide on price alone.

How do I compare two solar quotes with different system sizes?

Convert each to a price per kilowatt (divide the total installed price by the system size in kW) to get a rough like-for-like figure. Then adjust for component quality, warranty length and inclusions. Price per kW is a starting point for comparison, not the whole answer.

What is the difference between a product warranty and a workmanship warranty?

A product warranty is from the manufacturer and covers defects in the panels or inverter themselves. A workmanship warranty is from the installer and covers the quality of the installation, such as mounting, wiring and weatherproofing. You want both to be solid, because a great panel installed poorly will still cause problems.

Should I trust a solar quote given over the phone?

Treat a phone or on-the-spot price as an estimate, not a quote. A proper quote is in writing and names the exact panel, inverter and battery models, the warranties, and everything included. Without that detail in writing you cannot compare it fairly or hold anyone to it.

How many solar quotes should I get before buying?

Aim for at least three. That gives you a realistic price range and helps you spot an outlier that is suspiciously cheap or overpriced. Make sure each quote is itemised the same way so you are genuinely comparing like with like.