Every quote for solar panels in Melbourne seems to land somewhere between $3,000 and $13,000, with little explanation for why the gap is that big.
Searching for solar panel prices in Melbourne turns up numbers anywhere from around $3,000 to more than $13,000, and most comparison tools built to help buyers make sense of that range still work off a single figure, the total on the page, as though it settles the question on its own. Almost none of those quotes are describing the same system.
The price gap usually comes down to three things: the size of the system, the panels being used, and whether the quote includes or removes rebates. Ignore any of those and two quotes stop being comparable, no matter how close their totals land on the page.
2026 Melbourne Solar Prices by System Size
According to Solar Choice’s 2026 price index, a standard 5kW system, after the federal STC discount and GST, usually comes in at around $5,040. A 6kW system sits closer to $5,600, a 6.6kW system around $6,020, and a 10kW system about $8,530.
Most solar installers across Melbourne price somewhere within this range. Where your quote actually lands often comes down to one thing: the quality tier of the panels behind the number.
The detail worth noticing is the cost per watT. A 5kW system at that pricing works out to roughly $1.01 a watt, a 6.6kW system to around 91 cents a watt, and a 10kW system to about 85 cents a watt. The larger the system, the lower the cost per watt tends to fall, which is exactly why comparing two different size systems by their total price alone tells a buyer very little.
Standard and Premium Panels
Panel tier moves the number almost as much as system size does. Premium panels, generally higher-efficiency cells with longer warranties and a more established manufacturer behind them, typically cost twenty to thirty per cent more than a standard equivalent of the same wattage. A 6kW system priced around $5,600 in standard panels can climb to roughly $6,750 once it is quoted in a premium range, for an almost identical rated output.
Not every one of the solar energy companies operating in Melbourne is upfront about which tier a quote actually reflects, and a kW figure alone does not say whether the panels behind it are a budget import or a Tier 1 brand carrying a 25- year performance warranty. Asking for the specific panel model and its datasheet, rather than just the wattage, is the fastest way to find out what a number is actually buying.
Business Quotes and Home Quotes
Businesses comparing quotes are working from an entirely different base. Commercial systems typically start where residential ones stop, from around 10kW up to 100kW and beyond, and pricing is generally worked out per kW rather than as a flat total. A rough industry benchmark sits near $1,000 per kW installed for a mid-sized commercial job, though that figure tends to fall as scale increases, since a single design and mobilisation cost gets spread across far more panels.
The rebate mechanics change too. Systems above 100kW stop qualifying for the upfront STC discount that residential and small commercial systems receive, and instead generate large scale Generation Certificates over time, a mechanism that pays out gradually rather than as a discount at the point of sale. For a business with genuinely high daytime electricity use, a warehouse, a factory floor, a commercial kitchen, that shift rarely changes the underlying economics much. Commercial solar installers working with businesses like these are commonly seeing payback periods land inside three to six years, largely because the power gets used as it is generated instead of exported at a low feed rate.
A Comparable Quote From 365 Solar
None of this means the cheapest quote on the table is wrong, or the most expensive one is automatically safe. It means two quotes are only worth comparing once they describe the same system size, the same panel tier, and the same rebate maths, and a surprising number of quotes circulating right now do not make that easy to check at a glance.
365 Solar Australia designs and prices residential and commercial solar across Melbourne and Victoria with its own accredited installers, sets out the panel tier and the rebate breakdown on every quote it issues, and backs every installation with its own warranty on top of what the manufacturer already provides.
The cheapest solar quote isn’t always the best deal. A smaller system can hide behind a lower price tag. The installers worth trusting are the ones who make every detail clear, from panels to rebates.