VICTORIA / HOME BATTERY CALCULATOR

Would a home battery
pay back for you?

Estimate annual savings, payback time and a 15-year return using your electricity use, solar exports and actual quoted cost.

Instant resultNo email requiredAssumptions shown

Quick estimate

Your household.

Results update as you type

Where are you starting?

I already have solarEstimate the value of adding a battery.I’m planning solar + batteryEstimate the battery portion of a new system.

Average daily electricity use From your billkWhUsed after sunset An estimate is okay%Average solar exported each day From your solar bill or appkWhElectricity import rate What you pay$/kWhSolar feed-in tariff What exported solar earns$/kWhUsable battery capacity Not nameplate capacitykWhInstalled battery cost after discounts Use the battery portion of your quoteAUD

Model assumptions

90% round-trip efficiency, 95% availability, 2% annual degradation and no electricity-price escalation. VPP payments, finance costs, maintenance and backup value are excluded.

The default values are an illustration, not a quote or a current market average. Replace them with figures from your own bill and proposal.

Estimated paybackWithin the 15-year model

10.3years

On these inputs, cumulative bill savings recover the installed battery cost during the modelled period.

First-year saving: $919
15-year net benefit: $4,283
15-year ROI: 45%

Cumulative battery value.

Line crosses $0 when the installed cost is recovered.

Estimated battery energy used each day8.5 kWh

Range if usable daily energy is 20% lower or higher8.7–12.9 years

Check this estimate against your real usage.

Bring a recent electricity bill or interval data. Your calculator summary will carry into the enquiry.

Check my estimate

HOW THE ESTIMATE WORKS

Useful direction.
Not false precision.

The calculator estimates how much surplus solar can be stored and later used instead of grid electricity. It accounts for the electricity you no longer buy, then subtracts the feed-in tariff you give up by storing that solar rather than exporting it.

Available solar, evening demand and usable battery capacity limit the amount cycled each day. The 15-year view also reduces available capacity by 2% each year. Future electricity-price changes are excluded so the result stays in today’s tariff terms.

First-year savingstored solar × efficiency × availability × (import rate − feed-in tariff) × 365

A detailed assessment can replay interval meter data against a proposed battery. That is more reliable than a daily-average estimate, particularly for variable household loads, time-of-use tariffs or limited winter solar production.

CHECK THE CURRENT SETTINGS

Discounts and eligibility can change.

Use the installed price on a current written quote. The Australian Government describes eligible support through the Cheaper Home Batteries Program, while the Clean Energy Regulator publishes current battery eligibility and STC guidance.

Sources checked 23 September 2026. Verify current program settings before relying on an installation price.

Battery payback questions.

Is this a battery quote?

No. It is an educational estimate using the figures you enter. An installation proposal needs to account for your electrical system, existing solar, equipment, site conditions and the scope of work.

Should I enter the battery price before or after the federal discount?

Enter the installed battery cost after any discount shown on your written proposal. Battery support settings can change, so the calculator does not subtract a fixed rebate automatically.

Why does the feed-in tariff matter?

Solar used to charge a battery may otherwise have been exported. The calculator subtracts that forgone export value from the value of avoided grid electricity.

Does the result include blackout backup?

No financial value is assigned to backup power. Backup also depends on the inverter, switching equipment, circuits selected and the battery’s available power and energy.

Can interval meter data produce a better estimate?

Yes. Half-hourly or finer import and export data can show when surplus solar is available and when the household uses electricity, reducing reliance on daily averages.

A calculator is the starting point.

Compatibility, backup design, switchboard work and the pattern inside your interval data still shape the right battery.

Explore home battery systems

Would a home batterypay back for you?