Electricity usage
Total household usage sets the ceiling for potential savings.
🇦🇺 Built for Australian homeowners
Check If Solar
Is Worth It
Upload your electricity bill to estimate your solar payback and savings for your Australian home.
Bill-basedUses bill details when provided
Manual optionNo PDF bill? Enter usage manually
TransparentMethodology and assumptions are published
Estimates onlyNot financial advice
How it works
Three steps to your solar answer
01
Upload your bill
Drop up to 12 electricity bills. We extract usage and tariff fields to prefill your estimate.
02
Confirm key inputs
Review extracted data, confirm your state, and set quote assumptions if needed.
03
See your estimate
Get an estimated payback period, annual savings, and recommended system size.
What happens to your bill data
Get a first estimate before speaking to installers
Uploading a bill helps prefill usage and tariff fields for your estimate. You can also skip bill upload and enter details manually if you prefer.
What we use. Bill data is used to estimate usage patterns, tariff settings, and solar suitability inputs for your home.
Manual entry is available. If you do not have a PDF bill, you can still run the tool by entering usage and tariff details yourself.
Check before relying. Review extracted values before using results. Output is an estimate only and not financial advice.
More detail: Methodology
Why your bill matters
Generic calculators use broad averages. Your bill captures the details that change payback.
Usage and timing. Two homes with similar quarterly totals often have different daytime usage and self-consumption.
Tariffs and feed-in rate. Import rates, feed-in tariff, and supply charges all change your estimated annual value.
Quote assumptions. System size and installed price change payback, even with similar roofs.
Compare approaches: Solar Payback Calculator, Solar Savings Calculator, and Solar ROI Calculator.
What affects your solar result
Tariffs and supply charges
Import rates and fixed daily charges change the value of avoided grid power.
Feed-in tariff
Retailer and state settings change export value and payback.
Daytime self-consumption
Using more solar during the day improves savings versus exporting.
Roof potential
Orientation, shading, and usable roof area influence generation potential.
System size and installed cost
The balance between upfront cost and generation output drives payback period.
Location and state assumptions
State settings and local conditions set baseline generation and tariff context.
Battery inclusion
Adding a battery changes upfront cost, export behaviour, and estimated returns.
Example
A sample result might show:
Sample recommendation
Likely suitable for solar
Based on this sample usage and tariffMain inputs in this sample: 9,490 kWh annual usage, 28.27c import tariff, 7c feed-in tariff, and 50% daytime usage.
* Not based on your home.
^ Your actual estimate depends on your bill, tariffs, roof potential, system price, and usage pattern.
Frequently asked questions
Is SolarDecision financial advice?
No. SolarDecision provides informational estimates only. It is a decision-support tool and not financial or investment advice.
Can I use SolarDecision without uploading a bill?
Yes. You can continue without a PDF bill and enter your usage and tariff details manually.
Why does my feed-in tariff matter?
Your feed-in tariff sets what exported solar is worth. A lower feed-in rate makes daytime self-consumption more important for payback.
Is solar always worth it?
Not always. Results vary by usage, tariffs, roof suitability, system cost, and how long you plan to stay in the home.
Can SolarDecision compare solar and battery options?
SolarDecision can include battery assumptions where supported, but battery results depend heavily on your tariff, usage timing, battery size, installed cost, and how much stored energy you actually use.
More solar guides
Ready to find out?
Upload your bill or enter your usage manually.