Gridly
WA 6391 · Boddington
Solar Panel Installation in Williams, WA
Find a vetted solar installer in Williams. Compare quotes, check local solar data, and get a system designed for your roof.
Get Free Solar QuotesSolar Snapshot for Williams
Key data for sizing a solar system in Williams, WA 6391.
1,040
Population
5/day
Peak Sun Hours
9,636
Est. Annual Output (6.6 kW)
$1,359
Est. Annual Savings
3.7 yrs
Est. Payback (6.6 kW)
$3,159
STC Rebate (6.6 kW)
Zone 2
Dwelling Mix in Williams
Breakdown of dwelling types based on census data — relevant for understanding rooftop solar potential.
Houses
95%
354 dwellings
Townhouses
3%
12 dwellings
Apartments
1%
4 dwellings
Williams is predominantly freestanding houses, ideal for rooftop solar installation.
Solar Adoption in Williams 6391
Installation data from the Clean Energy Regulator, current to May 2026.
168
Solar Systems Installed
Since 2001
7.2 kW
Avg System Size
1.2 MW
Total Installed Capacity
6
Battery Systems
Williams (6391) has 168 registered solar panel installations with a combined capacity of 1.2 MW. The average system size in this postcode is 7.2 kW. That's roughly 19% of dwellings with rooftop solar.
Is Solar Worth It in Williams?
Williams gets 5 peak sun hours per day — above the national average. A 6.6 kW system here would produce roughly 9,636 kWh per year, saving an estimated $1,359 annually and paying itself off in 3.7 years.
At $5,041 after rebates, the upfront cost represents 6% of Williams's median household income ($91,520/year). Most households finance this over 3–5 years, with loan repayments typically offset by immediate savings.
Around 19% of dwellings in Williams have solar, below the Western Australia average of 36%. This means there's significant room for more installations — and early adopters tend to benefit most from current rebate levels before they taper off.
With a payback under 4 years and 20+ years of remaining system life, solar in Williams 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 Williams?
With 5 peak sun hours per day, Williams receives above-average solar irradiance for Australia. A standard 6.6 kW rooftop system here can generate approximately 9,636 kWh per year, saving an estimated $1,359 annually on electricity bills.
Williams has a population of 1,040 across 896 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 Williams is $91,520 per year. At $5,041 after rebates, a 6.6 kW system represents 6% of annual household income, with savings that continue for 20+ years after the 3.7-year payback.
With car ownership at 94% of households, many residents in Williams 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 Williams
Based on 5 peak sun hours/day, 31c/kWh electricity, and STC Zone 2 rebate.
| System Size | Annual Output | Annual Savings | Cost After Rebate | Payback |
|---|---|---|---|---|
| 5 kW | 7,300 kWh | $1,029 | $4,121 $2,379 STC rebate | 4 yrs |
| 6.6 kW Most popular | 9,636 kWh | $1,359 | $5,041 $3,159 STC rebate | 3.7 yrs |
| 10 kW | 14,600 kWh | $2,059 | $6,742 $4,758 STC rebate | 3.3 yrs |
| 13 kW | 18,980 kWh | $2,676 | $8,299 $6,201 STC rebate | 3.1 yrs |
Estimates assume 80% system efficiency, 35% self-consumption rate, 5c/kWh feed-in tariff, and STC Zone 2 ($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 Williams.
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 Williams get? ▼
Williams receives approximately 5 peak sun hours per day, based on its warm temperate climate zone. This means a standard 6.6 kW system can generate around 9,636 kWh annually.
What size solar system do I need in Williams? ▼
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 Williams? ▼
A 6.6 kW solar system in Williams costs approximately $8,200 before rebates. Williams is in STC Zone 2, which provides a rebate of $3,159 on a 6.6 kW system. After rebates, expect to pay around $5,041.
What is the payback period for solar in Williams? ▼
A 6.6 kW solar system in Williams has an estimated payback period of 3.7 years, based on 5 peak sun hours per day and annual savings of $1,359. After the payback period, the system continues generating free electricity for its remaining 20+ year lifespan.
Do I need council approval for solar in Williams? ▼
In Western Australia, most residential solar installations are considered exempt development. Heritage-listed properties or certain zones in Boddington may require approval. Your installer will confirm during the site assessment.
How Williams Compares to Nearby Suburbs
Solar potential compared with neighbouring suburbs in the Boddington area.
| Suburb | Sun Hours | 6.6 kW Output | Payback | Solar Adoption |
|---|---|---|---|---|
| Williams 6391 | 5h | 9,636 kWh | 3.7 yrs | 19% |
| Boddington 6390 | 5h | 9,636 kWh | 3.7 yrs | 30% |
| Cherry Tree Pool 6395 | 5h | 9,636 kWh | 3.7 yrs | 20% |
| Kojonup 6395 | 5h | 9,636 kWh | 3.7 yrs | 20% |
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 Williams.
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.