| 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 | $1,681 | $5,919 |
| Victoria | Zone 4 | $1,441 | $6,159 |
| Queensland | Zone 2 | $1,681 | $5,919 |
| South Australia | Zone 3 | $1,681 | $5,919 |
| Western Australia | Zone 3 | $1,681 | $5,919 |
| Tasmania | Zone 4 | $1,328 | $6,272 |
| Australian Capital Territory | Zone 4 | $1,441 | $6,159 |
| Northern Territory | Zone 1 | $1,972 | $5,628 |
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 $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 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 $1,681 in Sydney/NSW, varying by state), most households pay roughly $5,919 to $8,719 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 $258 per usable kWh on the first 14 kWh (tapered above), knocking roughly $3,483 off the battery price.
Get matched with a 8 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.