Gridly
WA 6725 · Derby-West Kimberley
Solar Panel Installation in Lagrange, WA
Find a vetted solar installer in Lagrange. Compare quotes, check local solar data, and get a system designed for your roof.
Get Free Solar QuotesSolar Snapshot for Lagrange
Key data for sizing a solar system in Lagrange, WA 6725.
11,236
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 Lagrange
Breakdown of dwelling types based on census data — relevant for understanding rooftop solar potential.
Houses
77%
2,593 dwellings
Townhouses
14%
473 dwellings
Apartments
2%
67 dwellings
Lagrange is predominantly freestanding houses, ideal for rooftop solar installation.
Solar Adoption in Lagrange 6725
Installation data from the Clean Energy Regulator, current to May 2026.
974
Solar Systems Installed
Since 2001
13.1 kW
Avg System Size
12.8 MW
Total Installed Capacity
28
Battery Systems
Lagrange (6725) has 974 registered solar panel installations with a combined capacity of 12.8 MW. The average system size in this postcode is 13.1 kW. That's roughly 10% of dwellings with rooftop solar.
Installations fell 32% in 2025 compared to 2024's 177 systems.
Is Solar Worth It in Lagrange?
Lagrange 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 5% of Lagrange's median household income ($106,080/year). A relatively small outlay for a 20+ year asset that generates returns from day one.
Around 10% of dwellings in Lagrange 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 Lagrange 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 Lagrange?
With 5.8 peak sun hours per day, Lagrange 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.
Lagrange has a population of 11,236 across 9,612 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 Lagrange is $106,080 per year. At $5,392 after rebates, a 6.6 kW system represents 5% of annual household income, with savings that continue for 20+ years after the 3.4-year payback.
With car ownership at 85% of households, many residents in Lagrange 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 Lagrange
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 Lagrange.
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 Lagrange get? ▼
Lagrange 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 Lagrange? ▼
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 Lagrange? ▼
A 6.6 kW solar system in Lagrange costs approximately $8,200 before rebates. Lagrange 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 Lagrange? ▼
A 6.6 kW solar system in Lagrange 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 Lagrange? ▼
In Western Australia, most residential solar installations are considered exempt development. Heritage-listed properties or certain zones in Derby-West Kimberley may require approval. Your installer will confirm during the site assessment.
How Lagrange Compares to Nearby Suburbs
Solar potential compared with neighbouring suburbs in the Derby-West Kimberley area.
| Suburb | Sun Hours | 6.6 kW Output | Payback | Solar Adoption |
|---|---|---|---|---|
| Lagrange 6725 | 5.8h | 11,178 kWh | 3.4 yrs | 10% |
| Broome 6725 | 5.8h | 11,178 kWh | 3.4 yrs | 10% |
| Sandfire 6725 | 5.8h | 11,178 kWh | 3.4 yrs | 10% |
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 Lagrange.
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.