Solar Payback Period in Perth (2026): How Long Until Solar Pays for Itself?
Quick answer: Most Perth homes that install solar on Synergy’s Home Plan A1 pay the system off in roughly 3 to 6 years, based on 2026 estimates. A 6.6 kW system typically saves around $1,300–$1,700 a year. Adding a battery lifts savings but also cost, so a combined solar and battery system usually takes around 4.5 to 8.5 years. Your figure depends on how much solar power you use yourself.
You want to know two things before you spend money on solar: how much it will cut your power bill, and how long until it has paid for itself. This guide answers both with the working shown, so you can check every number against your own bill.
We use Synergy’s rates from 1 July 2026, current Distributed Energy Buyback Scheme (DEBS) rates and indicative Perth system costs. Every figure is an estimate. Your roof, your usage and your quote will move the result.
What You’ll Find Here
- Payback ranges for 6.6 kW, 10 kW and 10 kW plus battery systems
- Annual savings by household size
- What Synergy pays for exported solar under DEBS in 2026
- Why self-consumption matters more than system size
- How to run the numbers for your own home
How Long Does Solar Take to Pay for Itself in Perth?
Solar-only systems in Perth usually pay for themselves in about 3 to 6 years. The fastest paybacks go to homes that use a lot of power during the day. The slowest go to homes that are empty from 8am to 6pm and export most of what they generate.
The table below summarises the three worked examples later in this guide. Costs are indicative Perth estimates for 2026, installed and including GST.
| System | Estimated cost | Estimated annual saving | Estimated payback |
|---|---|---|---|
| 6.6 kW solar (20 kWh/day home) | $5,000–$7,500 after STCs | ~$1,290–$1,720 | ~3–6 years |
| 10 kW solar (30 kWh/day home) | $8,000–$11,000 after STCs | ~$1,750–$2,410 | ~3.3–6.3 years |
| 10 kW solar + ~13 kWh battery (30 kWh/day home) | ~$16,000–$23,500 after STCs and battery rebates | ~$2,770–$3,650 | ~4.4–8.5 years |
Estimates only. Based on Synergy Home Plan A1 (33.26c/kWh, from 1 July 2026), DEBS buyback valued at a blended 3c/kWh, and generation of about 1,450 kWh per kW per year. Excludes future price changes, panel degradation and finance costs. Not a guarantee of savings.
Once a system has paid for itself, the savings keep coming for the rest of its working life. Quality panels usually carry 25-year or longer performance warranties, so the years after payback are where most of the value sits.
Worth knowing: Payback is simply the system cost divided by the yearly saving. A cheaper system is not always the faster payback. A system sized to your daytime usage, installed well and facing the right way, often wins.
How Much Can You Save on Electricity Bills With Solar in Perth?
A typical Perth family on Home Plan A1 can expect to save roughly $1,300 to $1,700 a year with a 6.6 kW system. Smaller households save less because they use less. Larger homes with a pool, ducted air conditioning or an EV save more.
| Household | Daily use | Yearly bill before solar (est.) | System | Estimated yearly saving |
|---|---|---|---|---|
| Couple (2 people) | ~12 kWh | ~$1,890 | 5 kW | ~$880–$1,200 |
| Family (4 people) | ~20 kWh | ~$2,860 | 6.6 kW | ~$1,290–$1,720 |
| Large home (5+ people, pool or ducted AC) | ~30 kWh | ~$4,080 | 10 kW | ~$1,750–$2,410 |
Bill before solar = daily use × 365 × 33.26c, plus the 119.24c daily supply charge (about $435 a year). Savings assume 30–50% of solar output is used in the home and the rest is exported at a blended 3c/kWh. Estimates only.
Why Your Bill Will Not Reach Zero
Solar cannot remove the daily supply charge. On Home Plan A1 that is 119.24c a day, or about $435 a year, and every grid-connected home pays it. So even a home with a large system and a battery should plan on a bill of a few hundred dollars a year, not nothing. DEBS credits can offset part of it.
Solar also does not touch the power you use at night unless you have a battery. For most families, the 5pm to 10pm window of cooking, air conditioning and screens is where the remaining bill comes from.
Before and After: A 4-Person Home With 6.6 kW
- Before solar: 20 kWh a day × 365 × 33.26c = about $2,430 in usage, plus $435 supply = ~$2,860 a year
- Solar used in the home: about 3,800 kWh a year (40% of output) × 33.26c = about $1,260 off the bill
- Solar exported: about 5,700 kWh × ~3c = about $170 in DEBS credits
- After solar: roughly $1,430 a year, a saving of around $1,430
Shift more of that family’s usage into daylight hours and the saving climbs toward the top of the range. Add a battery and most of the evening usage can come from stored solar instead of the grid.
For system pricing by size, see our Perth solar panel cost guide.
How the Payback Maths Works
Solar payback comes down to four numbers: how much your system generates, how much of that you use, what you earn for the rest, and what the system cost. Here is each one, with the assumption we used.
1. Generation per kW in Perth
The Clean Energy Regulator places Perth in solar zone 3, with a rating of 1.382 MWh per kW per year. That rating is used to calculate STCs and is deliberately conservative. Modelling tools such as NREL’s PVWatts usually show a north-facing, unshaded Perth roof producing a little more.
We use 1,450 kWh per kW per year (about 4 kWh per kW per day) as a middle estimate. That gives roughly:
- 6.6 kW: ~9,500 kWh a year (~26 kWh a day on average)
- 10 kW: ~14,500 kWh a year (~40 kWh a day on average)
Output is much higher in summer than winter, and east or west-facing panels, shading and dust all reduce it. Treat these as estimates, not promises.
2. Self-consumption: the share you use
Every kWh of solar you use yourself saves the full 33.26c you would have paid Synergy on Home Plan A1. We assume 30–50% self-consumption for solar-only homes. Bigger systems sit at the lower end because they produce more than a home can use in daylight.
3. Exports: what you earn for the rest
Solar you do not use is exported under DEBS for 10c (3pm–9pm) or 2c (all other times). Most exports happen in the middle of the day, so most earn 2c. We assume about 85% off-peak and 15% peak, which works out to a blended ~3c per kWh.
4. System cost
As a rough guide, most Perth homes pay around $5,000–$7,500 for a 6.6 kW system and $8,000–$11,000 for a 10 kW system in 2026, after STCs. Your price depends on panel and inverter choice, roof type and switchboard condition. The STC discount is applied at the point of sale, so you do not claim it separately.
The formula: Annual saving = (generation × self-consumption % × 33.26c) + (generation × export % × ~3c). Payback in years = system cost ÷ annual saving.
Worked Examples: 6.6 kW, 10 kW and 10 kW With a Battery
These three examples show the full working. The low saving uses the lower self-consumption figure and the high saving uses the higher one. The payback range pairs the cheapest cost with the highest saving, and the dearest cost with the lowest saving.
| 6.6 kW solar | 10 kW solar | 10 kW solar + ~13 kWh battery | |
|---|---|---|---|
| Household use | 20 kWh/day | 30 kWh/day | 30 kWh/day |
| Est. generation | ~9,500 kWh/yr | ~14,500 kWh/yr | ~14,500 kWh/yr |
| Self-consumption | 35–50% | 30–45% | 30–45% direct, plus 9–11 kWh/day from the battery |
| Solar used in home | 3,325–4,750 kWh | 4,350–6,525 kWh | 7,635–10,540 kWh |
| Value at 33.26c | $1,106–$1,580 | $1,447–$2,170 | see note below |
| Exports at ~3c | $143–$185 | $239–$305 | reduced by battery |
| Est. annual saving | ~$1,290–$1,720 | ~$1,750–$2,410 | ~$2,770–$3,650 |
| Est. cost | $5,000–$7,500 | $8,000–$11,000 | ~$16,000–$23,500 |
| Est. payback | ~2.9–5.8 years | ~3.3–6.3 years | ~4.4–8.5 years |
Example 1: 6.6 kW for a 4-person home
At 35% self-consumption, the family uses 3,325 kWh (saving $1,106) and exports 6,175 kWh (earning about $185). That totals around $1,290 a year. At 50%, they use 4,750 kWh ($1,580) and export 4,750 kWh ($143), about $1,720 a year. With a $5,000–$7,500 system, payback lands at roughly 3 to 6 years, with a midpoint near 4.4 years.
Example 2: 10 kW for a larger home
A 30 kWh/day home with a pool pump or ducted air conditioning uses more solar in absolute terms, even though the percentage is lower. At 30–45% self-consumption, the saving is around $1,750–$2,410 a year. Against an $8,000–$11,000 system, payback is roughly 3.3 to 6.3 years. See the 10 kW solar system cost guide for what drives the price range.
Example 3: 10 kW plus a ~13 kWh battery
We assume the battery delivers 9–11 kWh a day on average across the year. It will be full most summer days and only partly charged on cloudy winter days. Each stored kWh would otherwise have been exported for about 2c, and it now replaces grid power at 33.26c, so it is worth roughly 31c.
- Battery adds 3,285–4,015 kWh a year × ~31c = ~$1,020–$1,245
- Plus the solar saving from Example 2 = ~$2,770–$3,650 a year in total
- Cost: $8,000–$11,000 for solar plus ~$8,000–$12,500 for a 13–16 kWh battery after federal and WA rebates = ~$16,000–$23,500
- Payback on the whole system: ~4.4–8.5 years
Looked at on its own, the battery’s extra cost pays back in about 6.5 to 12 years. That is why the combined figure is longer than solar alone. VPP payments are not included because they vary by program.
How Much Does Synergy Pay for Solar Power in 2026?
Synergy pays 10c per kWh for solar exported between 3pm and 9pm, and 2c per kWh at all other times. These are the Distributed Energy Buyback Scheme (DEBS) rates, and DEBS payments are capped at 50 kWh a day.
| Export window | DEBS buyback rate (2026) |
|---|---|
| Peak: 3pm – 9pm | 10c/kWh |
| Off-peak: 9pm – 3pm | 2c/kWh |
| Daily cap | 50 kWh |
The catch is timing. Panels produce most of their power between about 9am and 3pm, which is the 2c window. By 3pm output is already falling, and by 6pm it is close to zero. So most Perth homes earn closer to 2–4c on average for what they export, not 10c.
Compare that with the 33.26c you pay to buy a kWh on Home Plan A1. Using a kWh of your own solar is worth about 16 times more than exporting it in the middle of the day. That gap is the reason self-consumption drives payback.
Quick tip: West-facing panels produce more in the late afternoon, when exports earn 10c and your own evening usage starts. They can suit homes that are empty during the day. Ask your installer to model both orientations.
For eligibility, how credits appear on your bill and how to apply, read our Synergy DEBS feed-in tariff guide.
Why Self-Consumption Changes Everything
Self-consumption is the single biggest lever on your savings. Two identical 6.6 kW systems on two identical roofs can produce savings around $430 a year apart, purely because of when each household uses power.
- 35% self-consumption (home empty on weekdays): ~$1,290 a year
- 50% self-consumption (someone home, appliances on timers): ~$1,720 a year
The easiest wins cost nothing. Run these between 9am and 3pm, when your panels are near full output:
- Pool pump on a timer
- Dishwasher and washing machine on delay start
- Electric or heat pump hot water on a daytime timer
- Pre-cooling the house with the air conditioner on hot afternoons
- Charging an EV at home during the day
Each kWh you move from the evening into daylight turns a 2c export into a 33.26c saving. Retirees, shift workers and people working from home tend to see the shortest paybacks for this reason.
What Is the Payback Period for a Solar Battery in Perth?
On its own, a home battery in Perth usually takes around 6.5 to 12 years to pay back, based on 2026 estimates after rebates. Paired with new solar, the whole system typically pays back in about 4.5 to 8.5 years.
Two rebates bring the cost down:
- Federal Cheaper Home Batteries program: about $2,600–$2,700 on a 10 kWh battery, applied at the point of sale. The STC rate per kWh falls on 1 January 2027.
- WA Residential Battery Scheme: up to $1,300 for Synergy customers or up to $3,800 for Horizon Power customers. Joining a virtual power plant (VPP) is required.
| Battery size | Before rebates (est.) | After federal + WA rebates (est.) |
|---|---|---|
| ~10 kWh | $9,500–$13,000 | ~$5,500–$9,000 |
| ~13–16 kWh | $13,000–$18,000 | ~$8,000–$12,500 |
| ~20–25 kWh | $18,000–$26,000 | ~$12,000–$19,000 |
A battery pays back faster when your evening usage is high enough to empty it most nights. If you only use 4–5 kWh after dark, a large battery will sit partly full and the payback stretches out. Our solar battery cost guide and battery payback calculator go deeper on sizing.
Solar first, or solar and battery together?
Solar-only gives the fastest payback for most homes. A battery makes more sense now if your evening usage is high, you want backup capability, or you want to lock in the federal rebate before the rate drops in January 2027. If budget is tight, choose a hybrid-ready inverter so a battery can be added later.
Does Synergy’s Midday Saver Plan Change Payback?
It can, mostly for homes with a battery. Midday Saver charges 8.85c from 9am to 3pm, 55.33c from 3pm to 9pm and 24.34c from 9pm to 9am, with a 132.78c daily supply charge. It needs an advanced meter.
- Solar-only homes: your panels already cover the cheap midday window, so the plan’s low daytime rate adds little. Any evening power you buy costs 55.33c instead of 33.26c. Many solar-only homes will be better off staying on Home Plan A1.
- Solar + battery homes: each kWh your battery supplies between 3pm and 9pm avoids 55.33c instead of 33.26c. Overnight top-ups are also cheaper than A1. That can raise the battery’s yearly value, though the supply charge is about $49 a year higher.
Check your own interval data before switching. Our examples above use Home Plan A1 only. Note that Synergy’s Smart Home Plan is closed to new customers.
What Speeds Up or Slows Down Your Payback
Your payback will be shorter than our examples if you use more power in daylight, and longer if your roof or usage pattern works against you.
| Speeds up payback | Slows payback |
|---|---|
| Someone home during the day | Home empty 8am–6pm |
| Pool pump, hot water or EV on daytime timers | Low overall usage (under ~10 kWh/day) |
| North-facing, unshaded roof | Shading from trees or neighbouring buildings |
| System sized to your actual usage | Oversized system exporting most of its output at 2c |
| Future electricity price rises | Finance interest added to the system cost |
| Panels kept reasonably clean | Dust build-up and poor-quality components |
How to Estimate Your Own Payback in 4 Steps
You can get a reasonable estimate from one Synergy bill and a calculator.
- Find your daily usage. Your Synergy bill shows average kWh per day. Most Perth homes sit between 12 and 30 kWh.
- Estimate generation. Multiply system size in kW by about 4 to get average daily output (6.6 kW ≈ 26 kWh a day).
- Split it. Multiply generation by 0.35 if the home is empty during the day, or 0.5 if someone is usually home. That is your self-consumed solar. The rest is exported.
- Run the numbers. Self-consumed kWh × 365 × $0.3326, plus exported kWh × 365 × $0.03. Divide your system cost by that total.
Example: 6.6 kW, someone home most days. 26 × 0.5 = 13 kWh used and 13 kWh exported. (13 × 365 × 0.3326) + (13 × 365 × 0.03) ≈ $1,578 + $142 = about $1,720 a year. A $6,250 system pays back in about 3.6 years.
Get an Accurate Payback Figure for Your Home
A generic estimate only goes so far. An accurate payback figure needs your real interval data, your roof’s orientation and shading, and a fixed quote.
Talk Energy Solar & Battery is based in Mount Pleasant and has completed 5,000+ installations over 7+ years. Systems are installed by in-house SAA-accredited electricians, with no subcontractors, and backed by a 20-year workmanship warranty and a 48-hour fix-or-replace guarantee. Customers rate us 4.8 stars from 300+ Google reviews.
We will size a system to your usage and show you the payback maths behind the recommendation, so you can check it yourself. Get a free, fixed quote or call (08) 6255 5914.
Frequently Asked Questions
How long does it take to pay off a 6.6 kW solar system in Perth?
A 6.6 kW solar system in Perth typically pays for itself in about 3 to 6 years. That estimate assumes a cost of $5,000–$7,500 after STCs and annual savings of around $1,290–$1,720 on Synergy’s Home Plan A1. Homes that use more solar during the day sit at the shorter end. Homes that are empty during the day and export most of their output sit at the longer end.
How much can I save on my electricity bill with solar in Perth?
A typical 4-person Perth home with a 6.6 kW system can save roughly $1,300 to $1,700 a year. A couple with a 5 kW system might save around $880 to $1,200, and a large home with a 10 kW system around $1,750 to $2,410. Solar cannot remove the daily supply charge of about $435 a year on Home Plan A1. These are estimates and depend on your usage and roof.
How much does Synergy pay for solar power in 2026?
Synergy pays 10c per kWh for solar exported between 3pm and 9pm and 2c per kWh at all other times under the Distributed Energy Buyback Scheme (DEBS). DEBS payments are capped at 50 kWh a day. Because most solar is exported in the middle of the day, most homes earn an average of about 2 to 4c per exported kWh.
What is the payback period for a solar battery in Perth?
A home battery on its own usually pays back in about 6.5 to 12 years in Perth, based on 2026 estimates after the federal and WA rebates. A 10 kW solar system with a 13–16 kWh battery typically pays back in about 4.5 to 8.5 years as a whole. Batteries pay back faster in homes with high evening usage that empty the battery most nights.
How much power does a solar system generate in Perth?
A well-oriented solar system in Perth generates roughly 4 kWh per kW per day on average across the year. That means about 26 kWh a day from a 6.6 kW system and about 40 kWh a day from a 10 kW system. The Clean Energy Regulator’s zone 3 rating for Perth is 1.382 MWh per kW per year, which is a conservative figure. Summer output is much higher than winter output.
Is solar still worth it in Perth with low feed-in tariffs?
Yes, for most homes that use a fair share of their solar during the day. Each kWh of solar you use yourself saves 33.26c on Home Plan A1, which is far more than the 2c or 10c you earn for exports. Payback of around 3 to 6 years leaves many years of savings over a system’s working life. Homes with very low daytime usage should size their system carefully.
