The average Sydney household pays around $1,380 a year in electricity — or $115 a month. The question everyone wants answered before going solar isn't "does it save money?" (it does) — it's "how much will it save me, specifically?"
The answer depends on three things: how much electricity you use, how much of your solar you consume directly (rather than export), and whether you have a battery. Let's break it down.
What a Typical Sydney Home Saves
A well-designed 6.6kW solar system in Sydney produces around 26–28 kWh of electricity per day on average. For most 3–4 bedroom homes, that's roughly equal to their total daily consumption — but the timing matters. Solar generates power during the day; most households use more in the morning and evening.
Without a battery, a typical household might self-consume around 30–40% of their solar generation, exporting the rest to the grid for a small feed-in tariff (currently 4.8–7.3 c/kWh in NSW).
| System | Annual Saving (No Battery) | Annual Saving (With Battery) |
|---|---|---|
| 6.6 kW | $1,200 – $1,500 | $1,600 – $2,000 |
| 10 kW | $1,800 – $2,400 | $2,400 – $3,200 |
| 13.3 kW | $2,200 – $3,000 | $3,000 – $4,000 |
These ranges are based on Sydney households with typical daytime and evening usage patterns. Homes where someone is home during the day will generally land at the higher end of each range, since more solar is consumed directly rather than exported.
Why Adding a Battery Changes the Equation
The gap between the solar-only and solar-plus-battery columns above comes down to one thing: self-consumption. Every unit of solar you use yourself is worth the full retail electricity rate (around 30–35c/kWh). Every unit you export is worth only 5–7c/kWh.
A battery stores your excess midday generation and releases it in the evening — shifting your self-consumption rate from around 35% to 80–90%. That dramatically improves the return on your solar investment without needing to change how you use electricity.
The Payback Period
With current rebates, a quality 6.6kW solar system in Sydney costs around $5,500–$8,000 after the STC rebate. At $1,300/year in savings, that's a payback period of roughly 4–6 years — with 19–21 years of essentially free electricity after that.
Adding a battery extends the payback period, but the 2026 battery rebate (around $335/kWh) has significantly closed that gap. A 10 kWh battery attracting $3,350 in rebates changes the maths considerably.
What Will Speed Up Your Payback?
- High electricity bills: The higher your current bill, the faster solar pays back. If you're spending more than $400/quarter, solar makes strong financial sense.
- Daytime usage: Running your dishwasher, washing machine, or EV charger during solar hours maximises self-consumption.
- Time-of-use tariff: Ask your retailer about time-of-use pricing — it lets you get maximum value from a battery by charging at off-peak rates and avoiding peak charges.
- Correct system sizing: An undersized system leaves savings on the table; oversized and you're exporting too much at low rates. A proper site assessment gets this right.
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