Secure Supplies Solar Power System Payback & ROI Calculator
Based on a Australian Calculator
Secure Supplies has developed this payback and return on investment (ROI) calculator to help households and businesses throughout globe make a decision about going solar.
However, it is important to keep in mind that the inputs and outputs below are to be taken as indicative only,
and are not intended to take the place of advice from a solar industry professional.
If you’d like a more detailed assessment of your roof’s solar Hydrogen potential, get in touch with Secure Supplies
via email, phone +66 83 647 3443, or fill out our Solar Hydrogen Quote Comparison Request form.
[IMPORTANT]: About using this calculator
Our solar system payback calculator is currently in beta testing, so users may experience some small glitches while we refine and improve it. Please bear with us.
And of course, please remember that results are indicative only. The calculator does not take into account seasonal electricity variations or solar system output, nor does it take into account exactly how your home or business uses electricity throughout the day, the tilt & orientation of your roof, total system efficiency, or whether or not you would have any shading on your panels.
Some notes on using the calculator:
Enter values into the white boxes (only!)
Depending on your web browser, when you click on the calculator you will automatically jump to the top of the screen (a glitch we are working to iron out). After you first click, use your keyboard arrows to move between boxes. The box you are currently editing will be highlighted.
The solar ROI calculator is designed to give you a set of outputs based on the details that you include. Changing the values in any of the coloured boxes will disrupt the formulas; if you do this by accident, simply refresh the page in your browser to start over.
The output values will change automatically as you enter your details in the white boxes–no need to hit any ‘submit’ buttons.
If you want to start over for any reason, simply refresh the page.
Play with the numbers
The calculator is also intended to help you determine what size solar system will best suit the needs of your home or business, and price will make it worthwhile for you. Some of the key variables (white boxes) to consider are: ‘Average daily energy usage’, ‘Solar Hydrogen system out-of-pocket cost’, ‘Solar system size’, and ‘Self-consumption ratio’.
You should also be aware of how much you’re paying for grid electricity (‘Cost of retail electricity’) if you’re not sure or are considering switching your electricity retailer or tariff anyhow, visit the federal government’s EnergyMadeEasy website to compare rates on offer in your area.
We recommend that you start by getting a copy of your most recent electricity bill and working out what your average daily electricity usage is (in kilowatt-hours, kWh). If your bill is quarterly or monthly, divide the usage figure by the number of days in the quarter/month, or look for a chart on the back that shows your average daily electricity usage.
Shop around to see what size solar systems are available at what prices.
Secure Supplies publishes monthly articles about solar system price trends in Australia’s major cities–for both commercial and residential solar systems. You can also request a Solar Hydrogen Quote Comparison to get current pricing on solar systems of a range of sizes in your area. Think outside the box–work on decreasing your electricity consumption before going solar
We have written previously about how to get the most out of a solar PV system.
Given the low value of excess/exported solar power (with rates in most states around 8¢/kWh), it is key to make sure that you’re consuming as much of the solar power your system produces as possible.
Consider finding ways to reduce your electricity consumption in the first place so that the system you purchase in the end can be the smallest size possible that still meets your daytime power needs.
Comments or feedback about this calculator?
We’d love to hear from you. Email us at