Gridly
WA 6710 · Ashburton
Solar Panel Installation in Onslow, WA
Find a vetted solar installer in Onslow. Compare quotes, check local solar data, and get a system designed for your roof.
Get Free Solar QuotesSolar Snapshot for Onslow
Key data for sizing a solar system in Onslow, WA 6710.
940
Population
5.8/day
Peak Sun Hours
11,178
Est. Annual Output (6.6 kW)
$1,576
Est. Annual Savings
3.4 yrs
Est. Payback (6.6 kW)
$2,808
STC Rebate (6.6 kW)
Zone 3
Dwelling Mix in Onslow
Breakdown of dwelling types based on census data — relevant for understanding rooftop solar potential.
Houses
81%
229 dwellings
Townhouses
5%
14 dwellings
Apartments
6%
16 dwellings
Onslow is predominantly freestanding houses, ideal for rooftop solar installation.
Solar Adoption in Onslow 6710
Installation data from the Clean Energy Regulator, current to May 2026.
310
Solar Systems Installed
Since 2001
9.4 kW
Avg System Size
2.9 MW
Total Installed Capacity
2
Battery Systems
Onslow (6710) has 310 registered solar panel installations with a combined capacity of 2.9 MW. The average system size in this postcode is 9.4 kW. That's roughly 43% of dwellings with rooftop solar.
Is Solar Worth It in Onslow?
Onslow gets 5.8 peak sun hours per day — above the national average. A 6.6 kW system here would produce roughly 11,178 kWh per year, saving an estimated $1,576 annually and paying itself off in 3.4 years.
At $5,392 after rebates, the upfront cost represents 4% of Onslow's median household income ($127,036/year). A relatively small outlay for a 20+ year asset that generates returns from day one.
Onslow already has strong solar uptake — roughly 43% of dwellings have rooftop solar, which is above the Western Australia average of 36%. The average system size of 9.4 kW suggests many homes have recently upgraded to larger systems.
With a payback under 4 years and 20+ years of remaining system life, solar in Onslow is one of the stronger return-on-investment cases in Western Australia. The question isn’t really whether solar is worth it here — it’s what size system to get.
Why Install Solar in Onslow?
With 5.8 peak sun hours per day, Onslow receives above-average solar irradiance for Australia. A standard 6.6 kW rooftop system here can generate approximately 11,178 kWh per year, saving an estimated $1,576 annually on electricity bills.
Onslow has a population of 940 across 720 dwellings. Western Australia's solar-friendly climate combined with electricity rates around 31c/kWh makes solar a strong choice for WA households.
The median household income in Onslow is $127,036 per year. At $5,392 after rebates, a 6.6 kW system represents 4% of annual household income, with savings that continue for 20+ years after the 3.4-year payback.
With car ownership at 90% of households, many residents in Onslow could benefit from pairing solar with a home EV charger. Charging an electric vehicle from rooftop solar can save $1,000 to $1,500 per year compared to grid charging.
Estimated Solar Output & Payback in Onslow
Based on 5.8 peak sun hours/day, 31c/kWh electricity, and STC Zone 3 rebate.
| System Size | Annual Output | Annual Savings | Cost After Rebate | Payback |
|---|---|---|---|---|
| 5 kW | 8,468 kWh | $1,194 | $4,355 $2,145 STC rebate | 3.6 yrs |
| 6.6 kW Most popular | 11,178 kWh | $1,576 | $5,392 $2,808 STC rebate | 3.4 yrs |
| 10 kW | 16,936 kWh | $2,388 | $7,210 $4,290 STC rebate | 3 yrs |
| 13 kW | 22,017 kWh | $3,104 | $8,923 $5,577 STC rebate | 2.9 yrs |
Estimates assume 80% system efficiency, 35% self-consumption rate, 5c/kWh feed-in tariff, and STC Zone 3 ($39/STC, 8-year deeming period). Actual results vary based on roof orientation, shading, and usage patterns.
Solar Rebates in Western Australia
Available incentives that reduce the cost of solar installation in WA.
STCs provide an upfront discount of $2,500 to $4,000 depending on system size.
Synergy and Horizon Power offer time-of-use tariffs that improve solar self-consumption economics.
Popular Solar Panels
Top-rated panels available for installation in Onslow.
Solahart Silhouette Series
455W, 22.8% efficiency
$165
Solahart SunCell Series
440W, 22% efficiency
$140
Canadian Solar TOPHiKu 6
440W, 22.5% efficiency
$130
Trina Solar Vertex S+
440W, 22% efficiency
$120
How Solar Installation Works
Site Assessment and Quote
An installer visits your property, assesses your roof, checks shading, and provides a detailed quote based on your energy usage.
System Design and Approval
Your system is designed to maximise output. Council approval may be needed for heritage properties, but most residential installs are exempt.
Installation
A residential solar installation typically takes one day. The team mounts panels, installs the inverter, and connects the wiring.
Grid Connection and Meter
Your installer lodges paperwork with your distributor. Once approved, your meter is upgraded to a bi-directional meter and you start exporting.
Frequently Asked Questions
How many peak sun hours does Onslow get? ▼
Onslow receives approximately 5.8 peak sun hours per day, based on its subtropical climate zone. This means a standard 6.6 kW system can generate around 11,178 kWh annually.
What size solar system do I need in Onslow? ▼
The right system size depends on your electricity usage. Average household consumption in Western Australia is 17 to 21 kWh per day. A 6.6 kW system suits most homes, while larger households or those with pools or EV chargers may benefit from a 10 kW or 13 kW system.
How much does solar installation cost in Onslow? ▼
A 6.6 kW solar system in Onslow costs approximately $8,200 before rebates. Onslow is in STC Zone 3, which provides a rebate of $2,808 on a 6.6 kW system. After rebates, expect to pay around $5,392.
What is the payback period for solar in Onslow? ▼
A 6.6 kW solar system in Onslow has an estimated payback period of 3.4 years, based on 5.8 peak sun hours per day and annual savings of $1,576. After the payback period, the system continues generating free electricity for its remaining 20+ year lifespan.
Do I need council approval for solar in Onslow? ▼
In Western Australia, most residential solar installations are considered exempt development. Heritage-listed properties or certain zones in Ashburton may require approval. Your installer will confirm during the site assessment.
How Onslow Compares to Nearby Suburbs
Solar potential compared with neighbouring suburbs in the Ashburton area.
| Suburb | Sun Hours | 6.6 kW Output | Payback | Solar Adoption |
|---|---|---|---|---|
| Onslow 6710 | 5.8h | 11,178 kWh | 3.4 yrs | 43% |
| Exmouth 6707 | 5.8h | 11,178 kWh | 3.4 yrs | 14% |
| Paraburdoo 6754 | 5.8h | 11,178 kWh | 3.4 yrs | 1% |
All estimates assume a 6.6 kW system. Sun hours, output, and payback are based on the same methodology. Solar adoption shows CER-registered installations as a percentage of dwellings.
Nearby Suburbs
Solar installers in suburbs near Onslow.
Related Products
Solar output estimates use Bureau of Meteorology irradiance data and assume north-facing panels with no shading. Population and dwelling data: ABS 2021 Census. Electricity rates are state averages and may differ from your retailer's pricing. Get a personalised quote for accurate savings.