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solar power calculator perth

Solar Panel Calculator Perth

Curious about how much you could save on your electricity bill with a solar system in Perth? Our solar panels cost calculator helps you estimate your potential solar savings in seconds. Whether you’re looking for a new solar system or upgrading an existing system, this calculator gives you an accurate estimate of your installation cost, payback period, and long-term benefits. Simply adjust your electricity usage, system size, and power offset to see how solar energy can transform your household expenses.

With Australian Government incentives and feed-in tariffs, your solar power system can deliver exceptional value. This tool is designed for homeowners comparing solar retailers and installers, helping you find the best system size and quality system for your property. The results give you clear insight into your system cost, total capacity, and potential savings over time.

Customise Your Estimate
Adjust the inputs below to match your current electricity bill and goals.
1,500 kWh
100 kWh4,000 kWh
$0.12/kWh
$0.01/kWh$0.50/kWh
50%
20%100%
10+ Year Warranty
SAA-Accredited Team
3,000+ Installations
$0 Upfront Finance
Your Solar EstimateLive
Recommended System Size
6.3 kW
16 panels
Estimated Annual Savings
$1,080
Estimated Cost
$6,125
Payback Period
5.67 yrs
Get an Exact Quote
Prefer to talk? Call us 1300 181 116
Estimate only. Based on average Perth conditions.

Behind the Numbers

How Our Solar Calculator Works

This calculator uses several real-world inputs — not generic national averages — to generate your estimate.

1

Your Bill & Usage Data

Your quarterly bill and monthly kWh usage reflect your actual consumption — not a generic estimate.

2

Perth Solar Output

Applies Perth-specific irradiance data — averaging 5.5–6.5 peak sun hours a day, higher than most capitals.

3

Government Rebates

The STC rebate is calculated from your system size, zone and current STC price, then factored into your cost.

4

Feed-In & DEBS Rates

Current Synergy DEBS rates calculate what you earn from exported energy via your smart meter data.

5

Installation Costs

Standard residential install costs are included. Final price varies with roof and switchboard condition.

Your Estimate Explained

Understanding Your Solar Savings Estimate

This calculator uses real-world data specific to Perth, WA — including solar output averages, current feed-in tariff rates, and the Australian Government STC rebate scheme.

Feed-In Tariff: What You’ll Earn Selling Energy Back

When your panels produce more than your home uses, the excess is exported to the grid and your retailer pays you a feed-in tariff. Under WA’s DEBS scheme, Synergy customers currently receive:

10c/kWh
Peak hours (3pm–9pm)
2c/kWh
Off-peak hours

How Payback Time Is Calculated

Payback time is the number of years for solar savings to equal the total system cost. A 6.6kW system in Perth costs approximately $5,500–$8,000 after the STC rebate. At an average bill of $450/quarter, most customers save $1,400–$2,200 per year — putting payback at 3–5 years, leaving 20+ years of savings on a 25-year warranty system.

3–5
year payback
20+
years of savings
System Size Approx. Panels Daily Output (Perth avg.) Best For
6.6 kW Most Popular 15–18 panels 26–30 kWh/day Average household (15–25 kWh/day use)
10 kW 22–26 panels 38–44 kWh/day Larger households, pools, EVs
13.2 kW 28–34 panels 50–58 kWh/day High-use homes, small business

Battery Storage

Should You Add a Battery?

With WA’s off-peak export rate at just 2c/kWh, storing your own power instead of exporting it is increasingly worthwhile — especially with rebates now available.

2¢
Off-peak export rate
32¢
Peak grid import cost
90%
Self-consumption w/ battery
$4,800
Combined rebates available
Synergy Residential Battery Scheme$130/kWh (up to $1,300)
Federal Cheaper Home Batteries Programup to $3,500
$4,800
in combined battery rebates available right now

Check My Battery Savings

Why Go Solar

The Benefits of a Solar Power System

A quality solar system pays you back in lower bills, government incentives and long-term energy independence.

Slash Your Power Bills

Offset up to 90% of your electricity usage and shield yourself from rising Synergy tariffs, year after year.

Government Rebates Applied

STC rebates and WA battery incentives are factored in upfront, cutting thousands off your out-of-pocket cost.

Built for Perth Conditions

Tier-1 panels rated for WA heat and UV, sized around Perth’s 5.5–6.5 peak sun hours for maximum output.

Fits Most Roof Types

Tin, tile or Klip-Lok — our CEC-accredited installers mount safely and neatly on virtually any roof.

Low Maintenance

No moving parts. An occasional clean is all it takes for 25+ years of reliable, quiet power generation.

Boost Your Home’s Value

A quality solar system is an asset buyers actively look for — and it keeps paying back well after installation.

Accuracy & Data

How Accurate Is This Calculator?

This solar power calculator gives you an instant estimate of your system size, cost and savings. Like the free, not-for-profit SunSPOT calculator developed by the Australian PV Institute (APVI) with UNSW, it relies on real Perth solar irradiance data rather than national averages.

The numbers are indicative only and a general guide — not financial or professional advice. Your actual result depends on roof area, orientation, shading and electricity use.

Where the solar data comes from

Perth enjoys some of the strongest sunshine of any Australian capital, averaging 5.5 to 6.5 peak sun hours a day. The calculator applies this location-specific data the same way trusted public tools do.

What the estimate includes

It factors in the main components — panels, inverter and optional battery — plus current STC rebates and Synergy DEBS feed-in rates. It excludes site-specific costs like switchboard upgrades, which is why we follow up with tailored advice.

Choosing Your System

How to Choose the Right System Size

Choosing the right solar system comes down to four inputs: your average electricity bill, your daily electricity use, your available roof area, and your location. Adjust these in the calculator to size a system that matches how and when you use power.

Matching system size to your usage

A household with a high bill and plenty of daytime usage profits most from a larger system. The calculator helps you offset the right share of your bill rather than over- or under-sizing it.

Roof area and location

Your roof area sets the maximum number of panels, while your location determines sunshine hours and output. Together they decide the largest system your property can realistically support.

Ready to see the difference? Use the calculator above for an instant estimate — then our team turns your figures into a firm quote at no cost and with no pressure.

Ready to Get Started?

Make the Most of Your Solar Investment

At Vista Electrical Controls, we design every system around your property, electricity usage, and long-term energy goals. Our process includes:

  • Detailed site assessment of your roof space, orientation, and shading
  • Smart meter data analysis to understand your usage profile
  • Personalised system recommendation with clear payback and savings projections
  • Professional installation by CEC-accredited installers
Call us

1300 181 116

Email us

[email protected]

Visit us

Unit 5, 6 Harvard Way, Canning Vale WA 6155

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FAQs

Frequently Asked Questions

A typical 6.6kW solar system uses 15–18 panels rated at 370W–440W each. A 10kW system uses approximately 22–26 panels. The calculator estimates panel count based on the system size you select. Your available roof space determines the maximum system size that can be installed.

A feed-in tariff is the rate your electricity retailer pays for excess electricity your solar panels export to the grid. In WA, Synergy customers receive 10c/kWh during peak hours (3pm–9pm) and 2c/kWh off-peak under DEBS. The best strategy is to maximise self-consumption rather than relying heavily on export income, because the export tariff is lower than the cost of buying electricity from the grid.

The calculator provides an accurate estimate based on real Perth solar output data, current Australian Government rebate values, and standard installation costs. Your actual savings will vary based on roof orientation, any shading, how much electricity usage falls during daylight hours, and your retailer’s tariff structure. For the most accurate estimate, follow up with a site inspection and personalised quote from our team.

Yes — battery storage can be added to most existing solar systems. Compatibility depends on your current inverter. Some inverters support direct battery connection (DC coupled); others work best with an AC coupled battery installed alongside the existing system. Our installers will assess your existing setup and recommend the best option.

Several factors affect your final system cost:

  • System size — larger systems cost more but generate greater savings
  • Panel brand and quality — Tier 1 panels carry stronger warranties and better long-term performance
  • Inverter type — string, hybrid, and microinverters are priced differently
  • Roof complexity — steep or multi-angle roofs take longer to install
  • Switchboard upgrades — older boards may need upgrading to handle solar safely
  • Battery storage — adds upfront cost but significantly improves long-term savings

For most Perth homes using 15–25 kWh per day, a 6.6kW system delivers excellent value. Larger households, those with a pool or EV, or properties with higher usage will benefit from a 10kW or 13.2kW system. Businesses typically install 10kW–100kW+ depending on roof space, daytime usage, and network capacity. Our installers can run detailed calculations using your smart meter data to find the exact best size for your property.

Solar panels are designed to last 25–30 years. Most quality panels carry a 25-year performance warranty guaranteeing at least 80–85% of original output at year 25, plus a separate 10–12 year product warranty against defects. Inverters typically last 10–15 years and may need replacement during the panel’s lifespan — worth accounting for in your long-term calculations.

Yes. The solar power calculator is completely free, with instant estimates and no pressure to buy.

The easiest way to size solar system options is to enter your average bill and usage into the calculator. It can be tricky to size solar system capacity by hand, so the tool matches panel count to your roof area and electricity use.