Solar & Battery Instant Savings Assessment | Future Power
Future Power Solar & Electrical Solar • Battery • EV Charging • Melbourne
Less than 2 minutes to complete
MODELLED FOR MELBOURNE CONDITIONS

Solar & Battery Instant Savings Assessment

Compare solar and battery options using modelling based on Melbourne solar production, seasonal weather and household energy conditions. Estimate future bills, savings and an indicative annual return before you commit.

✓ Free to use
✓ Quick personalised assessment
✓ Melbourne-based modelling
Step 1 of 4 — Your current setup Modelled using Melbourne solar and seasonal energy conditions.
Step 1

Your current energy setup

Start by choosing whether you want an instant Future Power system estimate or analyse a quote you have already received.

How would you like to use the calculator? You can change this selection at any time.
How would you like to enter your electricity bills? Use one monthly average, enter all 12 months, or enter four quarterly bill totals.
$ / month
Enter each month’s electricity bill Use the amount payable after solar credits and before any proposed battery or solar upgrade.
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Enter each quarterly electricity bill Enter the total amount payable for each three-month period, after solar credits.
$
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The calculator distributes each quarterly total across its three months using the seasonal demand profile while preserving the exact quarterly total.
kW
Enter the approximate panel capacity. It is commonly shown in your monitoring app, original invoice or inverter documentation.
Your current bill still reflects the benefit of the existing solar, even when it will be removed in the proposed system.
Advanced electricity settings (optional)
c/kWh
$ / day
% / year
Used only for long-term savings projections. Year-one savings remain at today’s rate.
c/kWh
Used to deduct the estimated feed-in credit forgone when surplus solar is stored in the battery.
% / year
Applied to projected savings after the first year. It does not change the first-year estimate.
You’ll enter the solar, inverter, battery and final price from your existing quote on the next page.
Step 2

Enter the system from your quote

These details are normally listed on the proposal you received. Use the usable battery capacity where available. You can compare free grid charging on the final results page.

kW
kW
kWh
$
Enter the final price after rebates, discounts and incentives.
Step 3

Future electrical loads

Include appliances or vehicles you expect to add. These can materially change the ideal battery size and future savings.

Important: Do not enter any loads that already exist, as they should already be reflected in your current electricity bill.
This provides a general heating and cooling estimate. Insulation, ceiling height, system efficiency and thermostat settings can significantly affect actual usage.
Step 4

Review and calculate

Check your answers and recommended package, then calculate your estimated savings.

Your assessment will be calculated first. Enter your contact details on the next screen to unlock the personalised result.
Your estimate

Solar & battery investment summary

The figures below are an indicative model based on the information entered.

Your calculated result Estimated savings and return for the package modelled below

Review your result first, then compare the same system with or without the three-hour free-energy option further down the page.

Estimated system suitability —
Estimated bill reduction —
—
Estimated monthly savings—Average across 12 months
Estimated annual savings—Before future tariff changes
Estimated first-year ROI range — Indicative range around the modelled first-year return
Estimated future monthly bill—Includes selected future loads
10-year projected savings—Includes the selected electricity price increase
Indicative outcome range See how normal variation may affect the result
Weather, household behaviour, solar production and battery operation can move the result above or below the central estimate.
Conservative
Annual savings—
Future monthly bill—
Central estimate
Annual savings—
Future monthly bill—
Favourable
Annual savings—
Future monthly bill—
Compare the same system with or without free grid charging
Switching this option instantly recalculates the savings, monthly bills, ROI range and battery utilisation.
Showing solar and battery operation without a free charging period.
Understanding your estimated ROI range Annual electricity savings ÷ system investment × 100

The first-year ROI is shown as an indicative range of five percentage points either side of the modelled central estimate. This reflects normal variation in usage, solar production and system performance rather than presenting a single precise figure. The 10-year average is also shown as a range and includes the selected price-growth and battery-degradation assumptions. Neither range is a guaranteed investment return, dividend or capital gain.

Property About 7–9% p.a. Illustrative long-term total-return range. Actual results can be reduced by interest, stamp duty, rates, maintenance, vacancies, selling costs and tax.
Australian shares About 8–10% p.a. Illustrative long-term range before fees and tax. Returns can vary significantly and values may fall in individual years.
Your estimated first-year ROI range — — The first-year and 10-year figures are displayed as indicative ranges. The 10-year average uses projected savings after the selected electricity-price growth and battery-degradation assumptions; it is not an IRR.
Below 6% Longer-term return 6–8% Moderate 8–12% Strong 12%+ Very strong
These comparisons are broad historical illustrations only and are not financial or tax advice. Property and share returns may be subject to income tax, capital gains tax, fees and other ownership costs. Battery savings are not directly comparable with market investments.

Estimated monthly bill comparison

Projected bill before the proposed system, savings and estimated bill after installation. Hover over a month, or tap it on mobile, to see exact figures.

Before Savings After

What is helping the result

    What to check before buying

      Current estimated grid use—
      Added future electrical load—
      Projected bill before proposed system—
      Solar system modelled—
      Proposed inverter capacity—
      Maximum three-hour grid charge—
      Average solar production—
      Estimated direct solar use—
      Energy delivered from battery—
      Battery utilisation—
      Equivalent battery cycles—
      Free grid charging benefit—
      Total grid energy offset—
      Estimated feed-in credit forgone—
      Out-of-pocket quote price—
      Estimated first-year ROI range—
      Annual electricity price increase—
      Battery degradation assumption—
      10-year projected savings—
      Electricity bill sourceAverage monthly bill
      Grid usage sourceDerived from bill and tariff
      Solar location modelMelbourne monthly solar production profile
      Solar performance factor82%
      Battery round-trip efficiency92%
      Usable excess-solar capture88%
      Existing solar used instantlyBased on usage profile
      Evening and overnight demandBased on selected usage pattern and future loads
      Maximum free grid chargeLower of the configured free-charge limit, battery size, or inverter kW × 3 hours
      Battery charging powerLimited by proposed inverter capacity and available charging hours
      Battery discharge powerLimited by proposed inverter capacity and estimated evening demand
      Solar-only maximum grid offset80% of annual grid energy, used as a conservative safeguard
      Battery degradation2% per year after year one
      Electricity price escalation3% per year, editable by the customer
      Feed-in tariff opportunity cost1 c/kWh deducted from stored surplus solar
      Outcome rangeConservative and favourable sensitivity factors
      Future electrical loadsAdded using the selections entered by the customer
      Daily variationRepeatable changes in household demand and weather are modelled throughout the year
      Protect your return on investment

      Important: workmanship and after-sales support can affect your return

      System design, installation workmanship, correct commissioning and after-sales support can all materially affect real-world performance. Poor installation or slow fault support may lead to reduced output, system interruptions or extended downtime—lowering electricity savings and reducing the overall value of the system.

      Why choose Future Power? Future Power uses only its own in-house installers—not subcontracted installation crews. This gives you more consistent workmanship, clear accountability and direct after-sales support if the system ever requires attention.
      Questions about your result? Ask a question or request further information

      Your calculator summary will be included automatically so Future Power can answer questions about the recommended system, savings estimate, free charging, solar capacity, blackout protection or installation requirements.

      Indicative estimate only. This calculator uses the Future Power daily state-of-charge model, Melbourne seasonal solar assumptions, repeatable day-to-day variation, household load estimates, battery efficiency, inverter limits, solar-capture allowances, the selected feed-in tariff and battery degradation. It cannot replace interval-meter data, a site inspection, network approval or a personalised energy assessment. The displayed range is a sensitivity guide rather than a guarantee. Retail plans, tariffs and free-energy periods can change.
      Future Power Solar & Electrical — Solar • Battery • EV Charging • Melbourne.