Melbourne's Solar Resource
Melbourne averages 4.4 peak sun hours per day — the lowest of any Australian mainland capital. The winters are genuinely cloudy, the spring is changeable, and the city gets a reputation for bad solar that it doesn't quite deserve. The reality is more nuanced: Melbourne's summer days are long and bright, and a well-sized north-facing system generates meaningful output year-round.
The seasonal swing is large. January can produce nearly 3× what June produces. If you're sizing primarily around winter adequacy, you'll significantly oversize. The right approach is to size for annual output relative to your annual usage, then manage seasonality with your usage patterns or a battery.
Melbourne's lower irradiance is partly offset by its cool climate: panels operate more efficiently in cooler temperatures, which reduces the output gap compared to cities like Brisbane or Perth where summer heat degrades panel efficiency on the hottest days.
Monthly AC output per 1 kW installed — Melbourne. Based on satellite irradiance data.
Victorian Solar Rebate
Solar Homes Program: Eligible Victorian households can claim a rebate of up to $1,400 off the cost of solar panels, plus an interest-free loan of up to $1,400 — a combined benefit of up to $2,800 on top of the federal STC rebate. Eligibility depends on household income, property value (under $3M), and whether you've previously received the rebate. Rebates are released in quarterly batches via Solar Victoria.
The state rebate stacks on top of the federal STC scheme, which applies as an automatic upfront discount regardless of state. Combined, a 6.6 kW system in Victoria can attract $4,000–$5,000+ in rebates before any out-of-pocket cost — making the effective price among the lowest of any Australian state.
What System Size Do You Need?
Melbourne's lower solar resource means a given system produces less annually than the same system in Brisbane or Perth. Sizing slightly larger than you might in a sunnier city is generally worthwhile if roof space allows. Below are estimates based on Melbourne's actual irradiance data.
| Daily usage | Typical household | Recommended system | Est. annual output |
|---|---|---|---|
| 8–10 kWh | 1–2 person unit | 3 kW | ~3,660 kWh |
| 14–18 kWh | Average family home | 6.6 kW | ~8,050 kWh |
| 25–35 kWh | Large home / EV | 10–13 kW | ~12,200–15,860 kWh |
Payback Period in Melbourne
A typical 6.6 kW system in Melbourne costs between $4,000 and $7,500 after both the federal STC rebate and the Victorian Solar Homes rebate (if eligible). Victoria's electricity rates average around 26–28c/kWh — lower than Sydney, which extends payback somewhat.
At those rates, a 6.6 kW system can save roughly $900–$1,200 per year, putting payback for most Melbourne households at 5 to 8 years. Without the Victorian state rebate (if ineligible or it sells out), add roughly 1–2 years to that estimate.
Melbourne's cooler climate means gas heating is more common than in Brisbane, so many households are considering solar primarily for air conditioning and general electricity use — not for offsetting heating costs. If you're switching from gas to an electric heat pump, the sizing equation changes and a larger system is likely warranted.
Should You Add a Battery in Melbourne?
Victoria's minimum feed-in tariff sits at around 4.9c/kWh — set annually by the Essential Services Commission. Some retailers offer higher rates (6–10c+), but the import/export gap remains substantial. The logic for battery storage is the same as elsewhere: capturing daytime solar for evening use at the full import rate is worth roughly 5× more than exporting it.
Melbourne's colder winters also mean evening energy demand (heating, cooking, lighting) is higher and longer than in Queensland, which suits a battery that dispatches stored solar into the evening peak. In summer, long twilight hours and moderate temperatures keep demand more manageable.
| Battery size | Best suited for | Est. extra savings/yr | Approx. installed cost | Battery payback |
|---|---|---|---|---|
| 5 kWh | Units / low evening use | ~$480 | $5,000–$7,000 | ~12 yrs |
| 10 kWh | Average family home | ~$840 | $9,000–$12,000 | ~12 yrs |
| 13–16 kWh | Large home / EV charging | ~$1,080 | $14,000–$18,000 | ~14 yrs |
Savings estimates assume a 6.6 kW solar system, 27c import rate, and 5c feed-in tariff. Battery payback in Melbourne is longer than in Sydney or Brisbane, primarily due to lower electricity rates. The Victorian government has at times offered battery rebates through the Solar Homes Program — check Solar Victoria's current offerings before purchasing.
Battery Lifespan and Degradation
Most residential batteries use lithium iron phosphate (LFP) chemistry and are warranted to retain around 70–80% of their original capacity at the 10-year mark. That means a 10 kWh battery installed today may only reliably deliver 7–8 kWh by year 10. The savings estimates above reflect year-one performance — in reality, the financial return gradually decreases as capacity shrinks.
Melbourne's climate is actually an advantage for battery longevity. Batteries degrade faster under sustained heat, and Melbourne's cooler average temperatures mean cells operate closer to their optimal range for more of the year. A battery installed in a shaded garage in Melbourne will generally outlast the same unit in a Queensland installation exposed to summer heat.
That said, installation location still matters. Avoid unventilated spaces, north-facing external walls, or areas where the battery will see radiant heat from the roof on hot summer days. Melbourne does get stretches of 38–40°C weather in January and February — a well-ventilated location makes a real difference to long-term cell health.
Things Worth Understanding Before You Buy
Melbourne's cloudy winters lead many households to over-size for winter adequacy. This typically results in significant excess generation in summer that gets exported at low feed-in rates. A better approach is to size for annual self-consumption and complement with a battery or smart appliance scheduling to handle seasonal variation.
Panel orientation matters. North-facing is optimal — Melbourne's latitude (~38°S) means the sun tracks lower in the sky than in Queensland, making north-facing panels particularly effective at capturing winter sun. East/west splits reduce annual output by 10–15% but smooth generation across the day, which suits households with morning and afternoon usage peaks.
The Victorian state rebate is released in quarterly batches through Solar Victoria and can sell out. If you're planning a purchase, check availability before committing to a timeline with your installer. The Solar Homes Program has historically been one of the most generous state solar incentive programs in Australia, and it meaningfully changes the Melbourne payback calculation.
Common Questions About Solar in Melbourne
Is solar worth it in Melbourne?
Yes, though the returns are more modest than in Brisbane or Perth. Melbourne's lower solar resource (4.4 peak sun hours/day) and lower electricity rates (~27c/kWh) mean longer payback periods than sunnier cities. The Victorian Solar Homes rebate (up to $1,400 off panels, plus a $1,400 interest-free loan) significantly improves the economics for eligible households. Most Melbourne homes see payback in 5–8 years.
What is the Victorian solar rebate and who is eligible?
The Solar Homes Program offers eligible Victorian households a rebate of up to $1,400 on solar panels plus an interest-free loan of up to $1,400 — $2,800 in total state support. Eligibility criteria: combined household income under $210,000/year, property value under $3 million, owner-occupier (not renter), and you haven't previously received this rebate. Rebates are released quarterly via Solar Victoria — availability can be limited, so check before committing to a purchase timeline.
How much does solar cost in Melbourne?
After the federal STC rebate, a 6.6 kW system typically costs $5,500–$9,000. With the Victorian state rebate applied as well, eligible households can bring this down to approximately $4,000–$7,500 out of pocket. Getting 2–3 quotes from CEC-accredited installers is the best way to find the right price for your roof configuration.
What size solar system do I need in Melbourne?
For an average Melbourne household using 14–18 kWh per day, a 6.6 kW system is the standard recommendation — producing around 8,050 kWh per year. Because Melbourne's solar resource is lower than other Australian capitals, sizing slightly larger (if roof space allows) gives better annual coverage. Use the calculator above to model your specific usage.
What is the feed-in tariff in Victoria?
Victoria has a minimum feed-in tariff set annually by the Essential Services Commission — currently around 4.9c/kWh. Some retailers offer higher voluntary rates (6–10c+). The gap between the ~27c import rate and the feed-in tariff is what drives the value of self-consumption: using your solar directly (rather than exporting) is worth roughly 5× more per unit.
Does Melbourne get enough sun for solar to be worthwhile?
Yes. Melbourne's reputation for bad weather is exaggerated in the context of solar. The winters are genuinely low-output, but the long, bright summer days make up for it. A well-sized north-facing system delivers meaningful annual savings, and the combination of federal and state rebates makes Melbourne one of the more financially supported states for solar despite the lower irradiance.
Should I switch from gas to electric and get a bigger solar system?
For many Melbourne households, yes — especially if your gas appliances are approaching end of life. Electric heat pumps (reverse-cycle AC) are 3–5× more efficient than gas heating per unit of electricity, and an electric induction cooktop and heat pump hot water system can eliminate your gas bill entirely. If you're electrifying your home, size your solar system to cover the new electrical loads — typically 10+ kW for a fully electrified family home. The calculator models this if you adjust your daily kWh input to reflect your post-electrification usage.
Compare Other Australian Cities
- Sydney, NSW — 5.1 peak sun hrs · high import rates (~39c/kWh)
- Brisbane, QLD — 5.5 peak sun hrs · strong east coast resource
- Perth, WA — 5.6 peak sun hrs · Australia's sunniest capital
- Adelaide, SA — 4.8 peak sun hrs · Australia's highest electricity rates
- Darwin, NT — outstanding dry-season solar resource
- Hobart, TAS — 3.9 peak sun hrs · Australia's southernmost capital
Run Your Melbourne Estimate
Enter your bill, your usage, and get a full 20-year cashflow — sized to Melbourne's actual irradiance data, with and without the Victorian rebate.
- ✓ Real irradiance data for Melbourne
- ✓ Victorian rebate factored in
- ✓ No account required
- ✓ Free
Estimates are based on satellite irradiance data for Melbourne, VIC (lat -37.81, lon 144.96). System costs, electricity rates, feed-in tariffs, and rebate availability vary and change over time. Victorian Solar Homes rebate eligibility subject to current program criteria — verify at Solar Victoria. This tool is for indicative purposes only — always verify with a licensed installer before purchasing. SolarSimLab does not sell solar systems or refer installer leads.