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More Calculators

EV, Solar & Energy tools. Choose a tool below to get started.

Results are estimates for guidance only. InFront Tech is not responsible for any reliance on these tools. Confirm figures with your installer or provider.

EV / Solar / Energy

Solar Payback Calculator (Simple)

Estimate payback period, annual savings and ROI. System size, power bill, feed-in tariff and battery option.

Battery Backup Sizing Tool (Home / Business)

Size a battery and inverter for key devices. Pairs well with UPS and backup power planning.

Solar Payback Calculator

Comprehensive payback and savings estimate. Enter your current bill, usage, system cost and rates. Includes battery and rebates.

Answer the questions below using your latest bill and a quote (or estimates). Results are indicative; confirm with your installer.

Bill-first mode: use your bill wording. Enter amount due (or bill total), bill period days (usually ~90), general usage kWh for that same period, and daily supply charge. We annualise automatically.

Required inputs

Q1) Bill amount and period
Use “Amount due” or “Total new charges incl. GST” for this bill period. Example: $743.51 for 90 days.
Use the exact bill period shown on your invoice (e.g. 90 days). This is used to annualise all values fairly.
Use the “General usage” kWh line for the same bill period (not exports). Example: 3,442 kWh.
This is the fixed daily network/retailer charge (often listed as Supply charge Daily). It applies even if usage is low.
Optional. If unknown, leave blank and we estimate from your bill amount, usage and supply charge.
Q2) How your usage is split through the day
This is your daytime load share. Higher % means you use more solar directly and export less. Typical homes: 25–45%.
Show advanced assumptions (optional)

System assumptions

Q3) Solar generation settings
From your installer quote (panel array size). Typical homes are often 6.6 kW to 13.2 kW.
Choose your location to estimate average daily sun. This drives annual solar generation.
Performance factor after real-world losses (heat, inverter, dirt, wiring). 0.85 is a common default.
Q4) Upfront system costs
Enter quoted system price before rebates. Leave blank to use default estimate per kW.
Any STC/government/retailer discount that reduces your out-of-pocket upfront cost.

Optional battery and tariff settings

Q5) Battery assumptions (optional)
Q6) Rates after solar

These are the tariff settings your retailer applies after solar is installed. They determine your new bill calculation.

Credit rate for each kWh exported to the grid. Check your plan’s “solar export” or “feed-in tariff” rate.
This is still your fixed daily network connection fee after going solar (you pay it even with zero usage). It is often the same as your current supply charge unless your plan changes.

Battery Backup Sizing Tool (Home / Business)

Size a battery and inverter for backing up key devices. Pairs well with UPS and backup power planning.

Enter the total wattage of devices you want to run during an outage and how long you need them to run. We estimate battery size, inverter size and a typical cost band.

Add up the watts of fridge, lights, modem, etc.
How long you need backup for

Results are estimates. Use as a design guide only; InFront Tech will not be responsible for any reliance on these tools or results.

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