| Panel count (typical) | 24 panels at ~440 W each |
| Inverter | 6 kW |
| Typical retail price | $7,600–$10,400 |
| Annual generation | ~11,600 kWh / yr |
| Daily generation | ~32 kWh / day |
| Roof area needed | About 40 m² of north-facing roof |
| Suits | 4–5 people, $500–$800 / quarter |
| Typical payback | 3–4 years |
Federal STC rebate on a 8 kW system, by state
The federal STC rebate scales with system size and STC zone. Here's what a 8 kW install attracts in each state in 2026:
| State | STC zone | Federal STC rebate | Net price (low end) |
|---|---|---|---|
| New South Wales | Zone 3 | $2,206 | $5,394 |
| Victoria | Zone 4 | $1,891 | $5,709 |
| Queensland | Zone 2 | $2,206 | $5,394 |
| South Australia | Zone 3 | $2,206 | $5,394 |
| Western Australia | Zone 3 | $2,206 | $5,394 |
| Tasmania | Zone 4 | $1,743 | $5,857 |
| Australian Capital Territory | Zone 4 | $1,891 | $5,709 |
| Northern Territory | Zone 1 | $2,589 | $5,011 |
Add state-specific rebates on top where applicable. The ACT and NSW stacks typically reduce net cost another $1,600–$2,500.
How a 8 kW system performs day-to-day
On a clear summer day in Sydney or Brisbane, a 8 kW system produces around 43 kWh. On an overcast winter day in Melbourne, it might produce 16 kWh. Annual average is about 32 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 8 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 8 kW system pairs naturally with a 13.5 kWh battery. The federal Cheaper Home Batteries Program pays about $271 per usable kWh on the first 14 kWh, tapering above, so the federal rebate alone covers about $3,631 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 8 kW solar
How much does a 8 kW solar system cost in 2026?
Fully installed, a 8 kW system costs between $7,600 and $10,400 retail before rebates. After the federal STC rebate (around $2,206 in Sydney/NSW, varying by state), most households pay roughly $5,394 to $8,194 net.
How much electricity does a 8 kW solar system generate?
A 8 kW system generates roughly 11,600 kWh per year on average in Australia, that's about 32 kWh per day. Output varies ±20% depending on location, roof orientation, and shading.
Who is a 8 kW system suitable for?
4–5 people households with quarterly bills in the $500–$800 / quarter range. You need roughly About 40 m² of north-facing roof. A step up for larger families or homes with ducted air-conditioning, pool pumps, or electric hot water. Pairs naturally with a 13.5 kWh battery.
What inverter pairs with a 8 kW solar system?
A 6 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 8 kW system?
A 13.5 kWh battery is the natural pairing for a 8 kW system. The federal Cheaper Home Batteries Program pays about $271 per usable kWh on the first 14 kWh (tapered above), knocking roughly $3,631 off the battery price.
Get matched with a 8 kW installer
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