Power your home with sunshine and watch your bills shrink

Australian homes are perfectly positioned to benefit from solar power. We receive some of the highest solar irradiance (that's the scientific term for 'how much sunshine hits a surface') in the world, which means even a modest rooftop system can generate a meaningful chunk of your household's electricity needs. A well-sized system for a typical Australian home will cover 60–90% of your daily usage, dramatically cutting what you pay to the grid.

The good news is that residential solar technology has improved enormously over the past decade while costs have dropped just as sharply. What cost $30,000 in 2010 can now be delivered for under $8,000 after government incentives — and the quality is far superior. Today's panels are more efficient, tougher, and backed by warranties that last a quarter of a century.

How does a home solar system actually work?

Your solar panels are made up of photovoltaic (PV) cells — tiny layers of silicon that release electrons when sunlight hits them, creating a flow of direct current (DC) electricity. That current travels to an inverter, a box usually mounted on your garage or utility-room wall, which converts DC into alternating current (AC) — the type your appliances, lights, and devices actually use. From the inverter it flows into your home's switchboard, ready to power whatever you have running.

Any electricity you generate but don't immediately use gets exported to the grid, and your energy retailer pays you a feed-in tariff (FIT) for it — a small credit per kilowatt-hour. Pairing your system with a battery storage solution means you can store that surplus for evenings and cloudy days instead of selling it cheaply, which tends to improve your financial return significantly.

What size system does my home need?

Sizing depends on three things: how much electricity you currently use, when you use it, and how much roof space you have facing north, north-east, or north-west (those orientations capture the most sun in Australia). Most households sit in the 6.6kW to 13.3kW range. A 6.6kW system generates roughly 26–28 kWh on a good sunny day, which covers the average Australian household's daily consumption with room to spare.

• Small households or apartments: 3kW – 5kW is usually adequate, keeping costs low while delivering solid savings.
• Average family homes: 6.6kW is the sweet spot — it's the most popular size and typically qualifies for the maximum Small-scale Technology Certificate (STC) rebate.
• Larger homes or those with electric vehicles: 10kW – 13.3kW captures more energy, charges an EV overnight via stored battery power, and maximises your return.
• Homes with pools or ducted air conditioning: upsizing slightly pays off fast because heavy loads that run during the day are virtually free to run once you're generating.

Understanding the government rebate — STCs explained

Australia's federal government supports residential solar through the Small-scale Renewable Energy Scheme, which creates Small-scale Technology Certificates (STCs) for every megawatt-hour of electricity your system is expected to generate over its lifetime (up to 15 years). Installers almost universally apply the STC value as a point-of-sale discount, meaning you never handle the certificates — you just pay a lower price. The rebate amount varies by your postcode's solar zone rating and the size of your system, but for a typical 6.6kW system in Brisbane or Sydney it currently reduces the installed cost by $2,000–$3,500.

Some states layer additional incentives on top — Victoria's Solar Homes Program offers a separate rebate of up to $1,400, while the ACT, NSW, and Queensland all have varying support schemes. Feed-in tariffs, where you're paid for surplus electricity exported to the grid, sit between 4 and 10 cents per kWh depending on your retailer and state.

The money side: payback periods and long-term returns

Here's how the numbers tend to work for a mid-size Australian household. Suppose you install a 6.6kW system for a net cost (after STCs) of $7,000. Your annual electricity savings from self-consumption, combined with modest feed-in tariff credits, typically total $1,500–$2,500 per year depending on your usage patterns and electricity tariff. That puts your payback period at roughly three to five years. With panels carrying a 25-year product and performance warranty, you're looking at 20-plus years of essentially free electricity after payback — a return on investment that most managed funds would envy.

• Self-consumption is king: every kilowatt-hour you generate and use yourself saves you the full retail electricity rate (currently 28–45c/kWh), which is far better than the 4–10c/kWh feed-in credit.
• Shift your loads: run your dishwasher, washing machine, and pool pump during peak sun hours (10am–3pm) to maximise self-consumption.
• Add a battery later: your inverter and switchboard can be battery-ready from day one, so adding storage in future is straightforward.
• Monitor your system: a good monitoring app lets you see generation versus consumption in real time, so you can spot any performance issues early.

Choosing the right installer

Quality of installation matters as much as quality of equipment. Always choose a Clean Energy Council (CEC) Accredited Installer — this is a federal government requirement for any rebate-eligible installation, and it means the installer has been trained and assessed to industry standards. Ask for references, check that the design comes with a shading analysis, and make sure your contract specifies the exact panels, inverter, and mounting hardware being used — not vague placeholders. A reputable installer will also handle your grid connection paperwork with your Distribution Network Service Provider (DNSP), which is the company that owns the poles and wires.

SolBuddy partners exclusively with CEC-accredited installation teams, and every system we design comes with a 12-month installation workmanship warranty on top of the manufacturer warranties. We're a no-pressure, education-first company — if solar isn't the right fit for your situation right now, we'll tell you honestly rather than push a sale.

Frequently asked questions