Victoria / Battery savings calculatorWhat could free midday
power save you?

See annual net bill savings, compare your options and find your next step. Start with a quick example, then refine it with your own figures.

Quick estimateNo email requiredAssumptions shown

01 / YOUR HOUSEHOLD

Start with your setup.

What do you have today?

I have solar + a batterySee what free midday charging could add.I have solar, want a batteryCompare savings and the battery’s payback.I’m planning solar + batteryExplore the battery part of your proposal.

What would you like to explore?

Solar storageFree midday power

Average daily grid importsExamplekWh

Use grid imports from your bill. Existing solar and battery savings are already included in that figure.

When do you use paid grid electricity?

Selectable assumptions for 4 pm–9 pm imports. Adjust the exact share below.

Starting example: 13.5 kWh usable battery, 10 kWh daily solar exports and a $9,500 battery installation after discounts. These are illustrative figures, not market averages or a quote.

Refine with my bill and equipment Optional

Your current bill

Grid imports used from 4 pm–9 pmExample%Average daily solar exportsExamplekWhCurrent average import rateExample$/kWhCurrent feed-in tariffExample$/kWhCurrent daily supply chargeExample$/day

Your proposed battery

Usable battery capacityExamplekWhBattery kept for backupExample%Battery installed cost after discountsExampleAUDBattery portion only. Use your written quote; no rebate is subtracted automatically.

The free-power plan

These are example prices. Confirm your offer, eligibility, billing clock and grid-charging permission before changing settings.

Existing grid use in the free windowExamplekWhOther paid use you can move to middayExamplekWhFrom outside the evening and free windows. Already included in daily imports; never add it twice.Proposed 4 pm–9 pm rateExample$/kWhProposed other paid-hours rateExample$/kWhA usage-weighted average, also used for imports above the free allowance.Proposed feed-in tariffExample$/kWhProposed daily supply chargeExample$/dayAvailable grid charging powerExamplekWPermitted battery input after other loads and site limits. Confirm with your installer.Free window durationExamplehoursWhole-house free import allowanceExamplekWh/daySpace available for extra grid chargingExamplekWhAllow for solar charging you already rely on. Capacity and backup reserve also limit this.Years assumed on the free-power planExampleyearsDefault: 1 year, then return to the current tariff for payback. Offers may change sooner.

Include grid charging, assuming my equipment and plan permit it

Model assumptions

90% round-trip efficiency, 95% battery availability and 2% annual capacity degradation. Grid charging uses remaining space after solar storage, free allowance after other household imports, charging power and evening demand. Current imports are already net of existing storage. The current tariff uses one average rate; proposed paid hours use two rates. Controlled loads, demand charges, VPP, finance, maintenance, replacement and backup value are excluded. Daily averages cannot reproduce seasonality or simultaneous loads.

No email required. Unchanged inputs use the examples shown.

02 / YOUR ESTIMATE

A clearer view
of your bill.

Start with a quick estimate. Then refine the figures with your bill or a written proposal.

01Annual net bill savings
02What creates the savings
03Your next practical step

Already have a battery? See additional savings.
Buying one? See the battery’s own payback.

HOW THE ESTIMATE WORKS

Your whole bill.
A useful comparison.

We start with grid imports from your bill, already net of direct solar and any battery you own. A proposed battery can store solar you would otherwise export. Free midday charging can top up remaining storage, within the confirmed window, whole-house allowance, charging power and evening demand.

The free-power comparison includes outside-window rates, daily supply charges and feed-in tariffs. Higher charges can outweigh free energy. Current prices use one average rate and proposed paid hours use two; replace these examples with usage-weighted figures from your actual plans.

First-year net bill savingcurrent annual bill − proposed annual bill

Battery payback uses only savings created by storage, excluding savings available by changing plans without buying a battery. The free offer is assumed for one year by default, then the model returns to solar storage at the current tariff. The 15-year projection includes 2% annual capacity degradation and is separate from any warranty.

For solar + battery projects, enter forecast grid imports after direct solar use and the battery portion of your quote. Panel costs and generation savings are excluded. A full year of interval data gives a more reliable assessment than daily averages.

CHECK THE CURRENT SETTINGS

Offers and eligibility can change.

Victoria’s Midday Power Saver has been available since 1 October 2026 for eligible households who opt in, with a daily 11 am–2 pm window and up to 24 kWh shared by household imports. Confirm retailer rates and equipment compatibility. The example prices are not the regulated tariffs or a retailer quote.

Midday Power Saver details checked 12 October 2026. Use a current written quote for battery cost after any eligible discounts.

Battery savings questions.

Does this include free midday electricity?

Choose Free midday power to compare a proposed plan with your current bill. The estimate includes remaining household allowance, grid-charging limits, losses, outside-window prices, supply charges and export income. Examples are not live retailer quotes.

What if I already have a battery?

Enter imports from your current bill and choose I have solar + a battery. Energy your existing battery already supplies is included in that bill and is not counted again. Only additional grid charging is valued; no payback is assigned to an existing purchase.

Is this a battery quote?

No. It is an educational estimate. An installation proposal needs to account for your electrical system, existing solar, equipment, site conditions and 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. The calculator does not subtract a fixed rebate automatically. For a solar + battery quote, enter only the battery portion.

Why does the feed-in tariff matter?

Solar used to charge a new battery may otherwise have been exported. We subtract that forgone export value and include changes to the feed-in tariff when comparing plans.

Does the result include blackout backup?

No financial value is assigned to backup. The reserve reduces capacity available for bill savings. Actual backup depends on equipment, selected circuits and available power and energy.

Can interval meter data produce a better estimate?

Yes. A full year of interval imports and exports shows when solar is available and when you use electricity. Daily averages cannot reproduce seasonality, time-of-use tariffs or simultaneous loads.

A calculator is the starting point.

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

Explore home battery systems

Victoria / Battery savings calculatorWhat could free middaypower save you?