One of the first questions Australians ask when considering solar is: "How much will I actually save?" The answer depends on your system size, how much solar power you use directly, and your electricity rate. But for most households, the savings are substantial — often $1,200 to $3,000 per year. Let's break down the real numbers.
Average Annual Savings by System Size
The table below shows typical annual savings for the most popular residential system sizes in Australia, assuming average electricity rates and a reasonable self-consumption ratio.
| System Size | Daily Output | Annual Savings | Best For |
|---|---|---|---|
| 6.6kW | 22–28 kWh | $1,200–$1,800 | Small to medium households (2–3 people) |
| 10kW | 35–42 kWh | $1,800–$2,500 | Medium to large households (3–5 people) |
| 13kW | 45–55 kWh | $2,000–$3,000 | Large households, EVs, pools, batteries |
Understanding Self-Consumption vs Export
This is the single most important concept for understanding your solar savings. When your panels generate electricity, it either gets used in your home immediately (self-consumption) or gets exported to the grid.
- Self-consumed energy saves you the full retail rate — typically 28–42c/kWh depending on your state and retailer.
- Exported energy earns you a feed-in tariff — typically just 5–7c/kWh in 2026.
The difference is enormous. Using 1 kWh of solar power yourself saves you roughly 5–8 times more than exporting it. This is why self-consumption is the key lever for maximising your savings.
| Self-Consumption Rate | Annual Savings (6.6kW) | Annual Savings (10kW) |
|---|---|---|
| 20% | $900–$1,100 | $1,200–$1,500 |
| 40% | $1,400–$1,700 | $1,900–$2,300 |
| 60% | $1,800–$2,200 | $2,500–$3,000 |
| 80% (with battery) | $2,100–$2,600 | $3,000–$3,600 |
Real Bill Reduction Examples
To make this concrete, here are three real-world scenarios:
Scenario 1: The Weekday Worker
Sarah lives alone in a Sydney apartment with a 5kW system. She works 9–5 on weekdays, so most solar is exported. With only 25% self-consumption, she saves about $950/year. Her quarterly bill dropped from $450 to $210.
Scenario 2: The Work-From-Home Family
The Patels are a family of four in Brisbane with a 6.6kW system. With someone always home running appliances during the day, they achieve 50% self-consumption. Annual savings: $1,700. Their quarterly bill dropped from $650 to $220.
Scenario 3: The EV and Battery Household
The Nguyen family in Adelaide has a 10kW system paired with a 10kWh battery and an electric vehicle. They charge the EV during the day and run the battery at night, achieving 75% self-consumption. Annual savings: $3,200. Their electricity bill is effectively zero, with small credits in summer.
Tips to Maximise Your Solar Savings
Getting the most out of your solar system doesn't require major lifestyle changes — just a few smart habits:
- Run major appliances during the day. Set your dishwasher, washing machine, and dryer to run between 10am and 2pm when solar generation peaks.
- Use timers on your hot water system. If you have an electric hot water system, set it to heat during solar hours. This alone can shift 3–5 kWh of daily usage to solar.
- Charge your EV during the day. If you have an electric vehicle, schedule charging for solar hours. An EV can absorb 7–10 kWh during a workday charge.
- Consider a battery. A home battery stores excess solar for evening use, typically boosting self-consumption from 30–40% to 60–80%.
- Stagger your appliance usage. Instead of running everything at once (which may exceed your solar output and draw from the grid), spread usage throughout the sunny hours.
- Use a solar monitoring app. Most inverters come with monitoring apps that show real-time generation and consumption. Use this to identify opportunities to shift usage.
Calculate Your Potential Savings
Want to know exactly how much you could save with solar? Our Solar ROI Calculator takes your specific electricity rate, usage pattern, location, and system size into account to give you a personalised savings estimate. It only takes a minute and could reveal thousands in annual savings.
The Long-Term Picture
Solar panels typically last 25–30 years with minimal degradation (losing about 0.5% efficiency per year). After your payback period of 3–5 years, everything else is pure savings. With electricity prices historically increasing by 3–5% annually, a system that saves you $1,500 today could be saving you $2,500+ per year in a decade's time. Over the full lifespan of your system, total savings commonly exceed $40,000–$60,000.