13kW Solar System for Large Melbourne Homes
The 13kW solar system is built for big, high-use households, the homes with ducted heating and cooling, a pool, multiple living zones and maybe an EV. Around 31 Tier 1 panels generate roughly 52 kWh a day in Melbourne, usually on a 3-phase connection, with plenty of surplus to feed a battery. CEC-accredited, with every Victorian rebate handled. Get a free, no-obligation quote built around your roof.
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When a Home Needs More Than the Standard System
Some homes simply use a lot of power, and a modest system spends half the year falling short. That's the gap a 13kW system fills.
Once a household runs ducted climate control across several zones, heats a pool, charges a car and is leaning toward an all-electric future, daily demand can climb past what a 10kW system comfortably covers. A 13kW solar system, often built as a 13.2kW array of around 31 panels, gives that kind of home real breathing room: it carries the heavy daytime loads and still banks a generous surplus.
At this scale, two practical things come into focus. First, a 13kW system usually needs a 3-phase connection, which most larger homes already have. Second, the surplus it produces makes it one of the best sizes to pair with a battery, because there's plenty left over to store. We cover output, the "is it too big" question, panels and 3-phase below.
13kW Solar System Specifications
Key specs for an average Melbourne installation. Your final design, including the 3-phase inverter setup, is tailored to your home during a free assessment.
Output figures are typical Melbourne averages across the year and vary with roof orientation, pitch, shading and season. A 3-phase connection is usually required at this size; we confirm yours during the assessment.
Is a 13kW Solar System Too Big for a House?
A 13kW system is right for large or high-use homes with ducted heating and cooling, a pool, multiple living zones, an EV or plans to go all-electric. It's only too big if your daytime use is low and you'd export most of it, in which case a smaller system, or pairing 13kW with a battery to store the surplus, makes more sense.
A great fit when
- You run ducted heating and cooling across several zones
- You have a pool, spa or large appliances running often
- You own an EV or plan to electrify gas appliances
- You're adding, or will add, a home battery
- You have the roof space and a 3-phase connection
Maybe size down if
- Your home is small and mostly empty during the day
- Your daily power use is modest and unlikely to grow
- You'd export most of the generation for a low feed-in rate
- Your roof can't comfortably fit around 31 panels
How Many Panels in a 13kW System, and What Does It Produce?
A 13kW solar system uses about 31 panels with modern 415 to 440 watt panels, often a 13.2kW array, needing roughly 60 square metres of roof. In Melbourne it produces around 52 kWh on an average day, or roughly 19,000 kWh a year, enough to run a large all-electric home through the day with surplus to spare.
52 kWh is genuine whole-home territory.
To picture it, 52 kWh a day can carry a large home's ducted air conditioning, a pool pump, multiple fridges, laundry, cooking and lighting, and still leave a meaningful surplus most of the year. On a strong summer day a 13kW system pushes well beyond that; in winter it tapers, which is normal across all system sizes.
The size of that surplus is exactly why a 13kW system and a battery are such a strong combination. A big home that exports a large slice of 52 kWh for a small feed-in rate is leaving value on the table. Store it instead, and you run the costly evening hours, and a good part of the next morning, on your own solar.
Explore Battery Options-
Powers a whole large home
Ducted climate, pool, multiple fridges and laundry all run off the roof during the day.
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Comfortable EV headroom
Charge an electric car from solar without robbing the rest of the house of power.
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Surplus made for storage
A large daily surplus is the ideal partner for a battery, so little goes to waste.
How Much Is a 13kW Solar System in Melbourne?
There's no single price for a 13kW system, because it depends on the panel and inverter brand, your 3-phase connection and switchboard, and the rebates you qualify for. The upside at this size is that the cost per kilowatt is usually lower than a small system. 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.
Because the install team, scaffolding, design and paperwork are much the same whether the system is small or large, the additional panels in a 13kW system are comparatively efficient spending. The main variables specific to this size are your 3-phase setup and whether your switchboard needs attention, both of which we assess up front. Eligible Victorians also receive the Solar Homes Program rebate of up to around $1,400 plus the federal STC discount, which we confirm and apply for you.
How 13kW Compares
The same award-winning team designs and installs every size. Here's where 13kW sits among its siblings.
| System | Approx. panels | Avg. output (Melb.) | Best suited to |
|---|---|---|---|
| 6.6kWview system → | ~16 panels | ~26 kWh / day | Smaller homes & small families, 1 to 3 people |
| 10kWview system → | ~24 panels | ~40 kWh / day | Medium & growing families, 3 to 5 people |
| 13kWYou're here | ~31 panels | ~52 kWh / day | Large, 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
~31 Tier 1 panels
Quality panels from brands like LONGi, REC and Q CELLS, laid out across your roof to maximise generation.
3-phase inverter
A reliable 3-phase Sungrow or Fronius inverter sized to a 13.2kW array, with hybrid options for a battery.
Export & switchboard
We configure export to your network's rules and check your switchboard is ready for a system of this size.
Warranties & rebates
Up to 25-year panel performance warranties, with the Solar Homes rebate and STC discount handled by us.
The Big-Home Solar & Battery Guide
A practical guide for large, high-use Melbourne homes weighing up a 13kW system, including how to size storage so almost none of your solar goes to waste. No jargon, no sales pitch.
- How to match a 13kW system and battery to a big home's usage
- Why 3-phase matters at this size, and how to check yours
- Running a pool, ducted climate and an EV on your own solar
- The solar and battery rebates, and what changes on 1 July 2026
The Rebates We Apply to Your 13kW System
Solar incentives reduce the up-front cost, and if you add storage, a battery incentive applies too. We confirm your eligibility and lodge every form.
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 →Cheaper Home Batteries
Adding storage to your 13kW system? The federal battery program reduces the cost, and its value steps down each year, so sooner is better.
Battery rebate VIC →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.
3-phase specialists
Larger, 3-phase systems are everyday work for us, designed, balanced and configured to your network's rules.
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 and roof, confirm your 3-phase connection and switchboard, and design the system.
Clear quote
One fixed quote with every eligible rebate already applied. No hidden extras, no surprises.
We install
Our CEC-accredited team installs neatly and tidily, and manages all grid approvals and paperwork.
Start saving
Switch on, monitor from the app, and watch your large home's grid reliance drop from day one.
13kW Solar Installation in Your Suburb
We install 13kW systems right across greater Melbourne and regional Victoria. Find your area below.
13kW Homes Across Melbourne
“Five bedrooms, ducted everything and a pool. The 13kW with a battery has basically taken us off the grid during the day, and we still run the pool pump guilt-free. Brilliant work.”
“We're going all-electric and an EV is next. They sized 13kW on our 3-phase and explained how the surplus would feed the battery. Proper advice, not a hard sell.”
“Big house on the Peninsula with a huge roof. They fit 31 panels neatly and the output has been even better than they projected. Tidy crew, great communication.”
13kW Solar System FAQs
How much is a 13kW solar system in Melbourne?
Is a 13kW solar system too big for a house?
How many panels are in a 13kW solar system?
How much power does a 13kW system produce per day?
Does a 13kW solar system need 3-phase power?
Is a 13kW system worth pairing with a battery?
Ready to Power Your Whole Home?
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