| Panel count (typical) | 30 panels at ~440 W each |
| Inverter | 8.2 kW |
| Typical retail price | $9,500–$13,000 |
| Annual generation | ~14,500 kWh / yr |
| Daily generation | ~40 kWh / day |
| Roof area needed | About 50 m² of north-facing roof |
| Suits | 4–6 people, $700–$1,000 / quarter |
| Typical payback | 3.5–5 years |
Federal STC rebate on a 10 kW system, by state
The federal STC rebate scales with system size and STC zone. Here's what a 10 kW install attracts in each state in 2026:
| State | STC zone | Federal STC rebate | Net price (low end) |
|---|---|---|---|
| New South Wales | Zone 3 | $2,101 | $7,399 |
| Victoria | Zone 4 | $1,801 | $7,699 |
| Queensland | Zone 2 | $2,101 | $7,399 |
| South Australia | Zone 3 | $2,101 | $7,399 |
| Western Australia | Zone 3 | $2,101 | $7,399 |
| Tasmania | Zone 4 | $1,660 | $7,840 |
| Australian Capital Territory | Zone 4 | $1,801 | $7,699 |
| Northern Territory | Zone 1 | $2,465 | $7,035 |
Add state-specific rebates on top where applicable. The ACT and NSW stacks typically reduce net cost another $1,600–$2,500.
How a 10 kW system performs day-to-day
On a clear summer day in Sydney or Brisbane, a 10 kW system produces around 54 kWh. On an overcast winter day in Melbourne, it might produce 20 kWh. Annual average is about 40 kWh per day.
For most homes, around 30–40% of that generation is consumed at home in real time. The rest is exported to the grid (and earns the feed-in tariff). Adding a battery typically pushes self-consumption to 80–90%.
Who a 10 kW system actually suits
We get this question on every specialist follow-up. Quick rule of thumb based on quarterly bill size:
- 5 kW — Under $300 / quarter · 1–2 people
- 6.6 kW — $300–$600 / quarter · 3–4 people
- 8 kW — $500–$800 / quarter · 4–5 people
- 10 kW — $700–$1,000 / quarter · 4–6 people
- 13.2 kW — $900+ / quarter · Large families, all-electric homes, or EV households
These are starting points. Other factors that bump you up or down: daytime usage (pool, EV, electric hot water), planned future loads (EV in the next 2 years pushes you up a size), shading, and roof orientation.
Battery pairing
A 10 kW system pairs naturally with a 13.5 kWh battery. The federal Cheaper Home Batteries Program pays about $258 per usable kWh on the first 14 kWh, tapering above — so the federal rebate alone covers about $3,483 off the battery price. Add NSW's PDRS per-kWh battery incentive or WA's Residential Battery Scheme on top where applicable.
Full Cheaper Home Batteries explainer →
Common questions about 10 kW solar
How much does a 10 kW solar system cost in 2026?
Fully installed, a 10 kW system costs between $9,500 and $13,000 retail before rebates. After the federal STC rebate (around $2,101 in Sydney/NSW, varying by state), most households pay roughly $7,399 to $10,899 net.
How much electricity does a 10 kW solar system generate?
A 10 kW system generates roughly 14,500 kWh per year on average in Australia — that's about 40 kWh per day. Output varies ±20% depending on location, roof orientation, and shading.
Who is a 10 kW system suitable for?
4–6 people households with quarterly bills in the $700–$1,000 / quarter range. You need roughly About 50 m² of north-facing roof. Common for larger family homes, especially in QLD, NT, and the Top End of WA where high daytime cooling loads justify the extra capacity.
What inverter pairs with a 10 kW solar system?
A 8.2 kW inverter is the standard pairing. The "oversized DC" approach (panels rated higher than the inverter) is legitimate — it captures more STC rebate (which is calculated on panel capacity) without significant real-world clipping.
Should I add a battery to a 10 kW system?
A 13.5 kWh battery is the natural pairing for a 10 kW system. The federal Cheaper Home Batteries Program pays about $258 per usable kWh on the first 14 kWh (tapered above), knocking roughly $3,483 off the battery price.
Get matched with a 10 kW installer
Free for homeowners. We pair you with one CEC-accredited installer who works your postcode, applies every rebate at point of sale, and stays accountable through to install.