The hidden cost of getting just one solar quote.

A 6.6 kW solar system on a single-storey tile roof in western Sydney can be quoted at $5,290 — and at $9,800. Same kilowatts. Same suburb. Same week. The hidden cost of taking one quote is that you'll never know which end of that range you walked away with.

Most homeowners don't get one quote because they think it's enough. They get one quote because getting three is exhausting. Each one is a site visit, a phone call, a follow-up, a sales push, a polite rebuff. By the time the first proposal lands in the inbox, the next two have already lost the war of attrition.

That fatigue is the entire reason solar pricing stays as wide as it does. So before we talk about how to escape it, let's look at the size of the spread itself.

01The spread is bigger than you think

Solar pricing is opaque on purpose. There is no published rate card. Two installers can quote identical hardware on identical roofs and arrive at completely different numbers, because the inputs they're optimising for are different:

• How busy their crew is this month
• What stock they have sitting in the warehouse
• How much they paid in marketing to find you
• Whether they'd rather win on price or win on margin

Industry-wide tracking from the Clean Energy Council and independent comparison platforms consistently puts the like-for-like spread on a residential 6.6 kW install at 30 to 60 percent. That's not the gap between cheap nasty kit and tier-1 — that is the gap on the same kit, same panel brand, same inverter model, same install scope.

The household that took the first quote that walked through the door — Installer D, because they advertise the loudest — paid $3,400 more than the household two streets over who happened to ring around. That household is not better at solar. They are better at having time.

02Why one quote tells you almost nothing

A single solar quote is a piece of information about a single installer. It is not a piece of information about the market. You cannot tell from it:

1. Whether the price is competitive or whether it's a $3,000 mark-up
2. Whether the panel brand is genuinely tier-1 or just "marketed as" tier-1
3. Whether the inverter is the install-friendly model or the one with a known firmware fault
4. Whether the workmanship warranty matches what other installers offer in your area

The retailer's salesperson can answer all of those questions in a way that sounds extremely reassuring. They are not lying. They are answering relative to the only catalogue they have. That's the structural argument we make in this companion essay.

03The "tier-1 panel" sleight of hand

Here is the trick the spread hides. "Tier-1" is not a quality rating. It is a Bloomberg New Energy Finance designation for panel manufacturers considered bankable — i.e., financially stable enough that a bank would lend money against their kit in a utility-scale project. It is closer to a credit score than a product review.

There are around 70 tier-1 manufacturers worldwide. They are not all of the same quality, and within each manufacturer there are multiple panel series at radically different price-points and performance levels. When a retailer's quote says "tier-1 panel," it has technically said almost nothing. The cheapest tier-1 panel and the best-in-class tier-1 panel can differ in degradation rates, temperature coefficients, and 25-year output by 8 to 12 percent.

You only catch that if you have a comparison sitting next to it. Which is the entire point of the next section.

04Three quotes still isn't enough

The classic homeowner advice — "get three quotes" — is half right. Three quotes does break the anchoring effect. But it does not guarantee the three quotes are comparable. The most common failure mode looks like this:

• Quote 1 specs a 6.6 kW system with Jinko Tiger N-Type panels
• Quote 2 specs a 6.6 kW system with a different (unnamed) tier-1 brand
• Quote 3 specs an 8.2 kW system, "for better long-term value"

Now you have three numbers and no way to put them next to each other. Each one is technically a quote for solar. None of them are a quote for the same thing. The homeowner ends up choosing on gut feel — which usually means whoever they liked most on the phone.

05What a broker actually fixes here

This is the entire reason the brokerage model exists. Not to sell you solar. To pull comparable quotes from a panel of installers who agreed in advance to compete on the same specification — so the spread becomes visible, the hardware is held constant, and the lowest-honest-price wins.

The job we do, step by step:

1. Spec the system independently based on your bill, roof, usage profile, and shading
2. Hold hardware tier constant across every quote we send out
3. Push the brief to 3–5 retailers who have available capacity in your area this month
4. Filter out non-compliant returns (wrong panel, wrong inverter, wrong scope)
5. Hand you the three best, ranked, with the price spread visible on a single page

You are not chasing installers. You are not playing apples-to-oranges with their proposals. You are looking at one page that says, "for this exact system on your exact roof, here are the three sharpest offers in the market this week, and here is the one we recommend."

06The cost of doing nothing

If you take only one number from this essay, take this one: the average Australian household that buys solar from the first installer who quotes them overspends by between $2,800 and $4,400 on the install, on identical hardware. That is not a soft "could have saved" figure. That is what the same panels and inverter cost two suburbs over.

One quote is a piece of information about an installer. Three quotes is a piece of information about the market. The reason the brokerage model exists is to make the second one as easy as the first.