6.6kW Solar System for Melbourne Homes
The 6.6kW solar system is the most popular size in Australia, and for good reason. Around 16 Tier 1 panels with a 5kW inverter produce roughly 26 kWh a day in Melbourne, enough to cover most of a smaller home or small family's daytime power. It's CEC-accredited, battery-ready, and we apply the Solar Homes rebate and STC discount for you. Get a free, no-obligation quote built around your roof.
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Why the 6.6kW Solar System Is So Popular
If you've been quoted a "6.6kW system," you're looking at the most installed solar size in the country, and there's a neat reason behind the oddly specific number.
In Australia, a 6.6kW panel array is paired with a 5kW inverter. That's deliberate: the rules allow your panels to be oversized up to 133% of the inverter, and 6.6kW sits right on that sweet spot. Oversizing this way means the system produces closer to its full potential earlier in the morning and later in the afternoon, squeezing more usable power out of every sunny day, without paying for a bigger inverter than you need.
For a smaller Melbourne home or a small family, a 6.6kW system hits the balance most people are after: enough generation to take a real bite out of the power bill, a footprint that fits most roofs, and an easy path to add a battery later. Below we cover the exact specs, how much it produces, whether it's enough for your household, and how to think about cost.
6.6kW Solar System Specifications
The key specs at a glance, for an average Melbourne installation. Your final design is tailored to your roof during a free assessment.
Output figures are typical Melbourne averages across the year and vary with roof orientation, pitch, shading and season. Panel wattage and inverter brand are matched to your roof and budget.
How Much Does a 6.6kW Solar System Cost in Melbourne?
There's no single price that's right for every home, because the cost of a 6.6kW solar system depends on the panel and inverter brand, your roof type and access, whether you need a switchboard upgrade, and which rebates you qualify for. We give you a fixed, all-inclusive quote with the Solar Homes rebate and STC discount already applied, so you see the real figure for your home, not a generic number.
Two government incentives bring the cost of a 6.6kW system down for eligible Victorians: the Solar Homes Program rebate of up to around $1,400, and the federal STC discount, which is applied at the point of sale. We confirm exactly what you qualify for and lodge the paperwork, so the figure in your quote is the figure you pay.
Is a 6.6kW Solar System Enough for a Family of 4?
A 6.6kW system suits many smaller families and covers most daytime electricity use, producing around 26 kWh a day in Melbourne. A busy family of four with high evening use, ducted heating or cooling, a pool or an EV will often get more value from a 10kW system, or from pairing 6.6kW with a battery to use more of the solar after dark.
It comes down to when you use power, not just how much.
A 6.6kW system shines when a good chunk of your usage happens while the sun is up, the dishwasher, washing machine, pool pump and daytime cooling. For a household that's out all day and uses most of its power at night, the same system still helps, but a battery makes a big difference because it stores the surplus for the evening peak.
If your roof and budget allow and your usage is on the higher side, stepping up to a 10kW system often costs proportionally less per panel and future-proofs you for an EV or all-electric home. Not sure which way to go? That's exactly what the free assessment is for.
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Good fit: daytime-heavy homes
If appliances run while you're home during the day, 6.6kW covers a lot of it straight away.
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Add a battery for evenings
High night-time use? Store the surplus and run on solar after dark instead of exporting it cheaply.
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Size up if usage is high
Pool, ducted climate control or an EV on the horizon usually points to 10kW or more.
How Many Panels Is a 6.6kW System, and What Does It Produce?
A 6.6kW solar system uses about 16 panels with modern 415 to 440 watt panels, needing roughly 30 square metres of roof. In Melbourne it produces around 26 kWh on an average day, or roughly 9,500 kWh a year, higher in summer, lower in winter, and dependent on your roof orientation, pitch and any shading.
To put 26 kWh a day in context: that's enough to comfortably run a fridge, lights, a load or two of washing, a dishwasher and daytime cooling for a smaller household, with power to spare on a sunny day. The more of that you use as it's generated, the more you save, which is why north and west-facing panels and a smart load habit (running big appliances midday) make a real difference. A battery captures whatever you don't use so none of it goes to waste.
Compare 6.6kW With Larger Systems
Same award-winning local team designs and installs every size. Here's how 6.6kW sits next to its bigger siblings.
| System | Approx. panels | Avg. output (Melb.) | Best suited to |
|---|---|---|---|
| 6.6kWYou're here | ~16 panels | ~26 kWh / day | Smaller homes & small families, 1 to 3 people |
| 10kWview system → | ~24 panels | ~40 kWh / day | Typical family homes, 3 to 4 people |
| 13kWview system → | ~31 panels | ~52 kWh / day | Larger, high-use homes, 4 to 5 people |
| 20kWview system → | ~48 panels | ~80 kWh / day | Large / all-electric homes, 5+ people |
All systems are sized to your actual usage and roof. Back to all residential solar systems →
What's in Your Installation
~16 Tier 1 panels
Quality panels from brands like LONGi, REC and Q CELLS, matched to your roof orientation and pitch.
5kW inverter
A reliable Sungrow or Fronius inverter, hybrid options available so you can add a battery later.
App monitoring
Track your generation and usage from your phone and see exactly what your system is doing.
Warranties & rebates
Up to 25-year panel performance warranties, with the Solar Homes rebate and STC discount handled by us.
Is a 6.6kW System Right for You?
A short, plain-English guide to help you decide whether 6.6kW is the right size, or whether you'd be better with 10kW or a battery. No jargon, no sales pitch.
- A simple checklist to size your system from your power bill
- When 6.6kW is plenty, and when to step up to 10kW or add a battery
- The Solar Homes rebate & STC discount, and what changes on 1 July 2026
- 7 questions to ask any installer before you sign
The Rebates We Apply to Your 6.6kW System
Two incentives reduce the cost of a 6.6kW system. We confirm your eligibility and lodge the paperwork, so nothing slips through.
Solar Homes Program
Solar Victoria's rebate on rooftop solar, up to around $1,400 for eligible owner-occupiers, applied to your system cost.
Solar rebate VIC →Federal STC discount
Small-scale Technology Certificates cut the up-front price of your system, applied as a point-of-sale discount with no claim to lodge yourself.
All incentives →Award-Winning, Accredited, Genuinely Local
Award-winning
Winners of the 2023 CEC Collaboration Award and the 2024 EUPD Australian Installer Award.
Accredited & approved
NETCC Approved Seller and CEC-accredited installers, the credentials that protect your rebates and warranties.
Local Cranbourne team
100% Australian-owned, installing for homes right across Melbourne and Regional Victoria, and we answer the phone.
Paperwork handled
We confirm your rebates, lodge the forms and manage grid pre-approval, you just enjoy the savings.
From Quote to Switch-On
Free assessment
We review your bill, roof and energy goals and confirm whether 6.6kW is the right fit, no obligation.
Clear quote
One fixed quote with every eligible rebate already applied. No hidden extras, no surprises.
We install
Our CEC-accredited team installs neatly, usually in a day, and manages grid approvals and rebate paperwork.
Start saving
Switch on, monitor from the app, and watch your reliance on the grid drop from day one.
6.6kW Solar Installation in Your Suburb
We install 6.6kW systems right across greater Melbourne and regional Victoria. Find your area below.
6.6kW Customers Across Melbourne
“Perfect size for our place. They were upfront that 6.6kW was plenty for the two of us and didn't try to upsell. The app shows us hitting about 26 units on a good day, just like they said.”
“Went with 6.6kW and had them set it up battery-ready. Added the battery a year later and it was a quick job because they'd planned for it. Great advice from the start.”
“They handled the whole Solar Homes rebate and explained the 6.6kW and 5kW inverter combo so it actually made sense. Clean install, on time, friendly crew.”
6.6kW Solar System FAQs
How much does a 6.6kW solar system cost in Melbourne?
Is a 6.6kW solar system enough for a family of 4?
How many panels is a 6.6kW solar system?
How much power does a 6.6kW system produce per day?
Why is 6.6kW such a common solar system size?
Can I add a battery to a 6.6kW system later?
Ready for Your 6.6kW System?
Get a free, no-obligation quote with every rebate already applied. Tell us about your home and a local Supply Solar specialist will call you within 2 business hours.
No obligation · Free site assessment · CEC-accredited · We handle all rebates