Estimate how much solar and battery storage could reduce your electricity costs. This tool uses simple average production assumptions and your own energy usage inputs to provide a guide only.
📍 Closest capital city
Determines estimated solar production using average peak sun hours for your region.
⚡ Your current electricity usage
kWh per day
$ per kWh
$ per day
$ per kWh
Energy used during solar production hours50%
10%90%
Estimated percentage of daily electricity use occurring during daylight hours while solar is producing.
☀️ Proposed solar and battery system size
The solar size below represents new solar being added. Treat this as total solar if you have no existing system.
Proposed new solar size10 kW
3 kW40 kW
Battery size15 kWh
5 kWh100 kWh
🏠 Existing solar
kW
kWh per day
Your daily export estimate helps calculate how much existing excess solar could be stored in a battery rather than exported to the grid.
💳 Finance option
Amount financed
?
Estimated system cost is calculated using $650 per kW of solar and $800 per kWh of battery storage. This is a simple estimate only. Final pricing can vary depending on product selection, installation variables, site conditions, location, rebates, switchboard requirements, backup requirements and metering.
$ — Auto-estimated from selected system size. Edit to use your own figure.
% per annum
years (1–15)
Estimated annual savings
$0
Based on your inputs and average solar production
Simple payback
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Daily solar generation
—
Solar used directly
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Battery energy used later
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Solar exported to grid
—
Grid energy still needed
—
Monthly repayment
—
Annual repayment
—
Estimated first year net benefit
—
This estimate is based on your inputs and average production assumptions. A final result depends on roof layout, shading, tariffs, export limits, battery settings and final system design.
📊 Savings breakdown
Solar used directly
—
—
Battery energy used later
—
—
Solar exported to grid
—
—
⚠️ Things to consider
📈 Projected savings over time
Annual savings
Cumulative repayments
Cumulative net benefit
Assumes 5% annual electricity price increase. Feed-in tariff held constant.
Cumulative savings over 10 years
Total estimated savings
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Total after finance repayments
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Want a more accurate assessment?
This calculator is a useful guide, but a proper solar and battery recommendation should consider your roof, usage profile, tariff, backup needs, export limits and long-term energy goals.
Residential and commercial solar and battery systems across Queensland, New South Wales and Victoria
Long-term energy partner, not just a discount installer
This calculator uses a simplified daily energy balance model.
Solar production is estimated using average peak sun hours for the selected capital city.
The daytime usage percentage estimates how much of your electricity use occurs while solar is being produced.
Battery storage is assumed to charge from excess solar and discharge later to offset grid imports.
Battery round trip efficiency is assumed to be 90%.
Battery stored solar is valued using the difference between your usage rate and feed-in tariff.
Feed-in tariffs are not assumed to increase over time.
Electricity usage rates are assumed to increase by 5% per year in the projection graph.
Estimated system cost is calculated using $650 per kW of solar and $800 per kWh of battery storage.
The calculator does not account for shading, roof orientation, panel orientation, inverter clipping, seasonal variation, export limits, demand tariffs, controlled loads, backup reserve settings, blackout backup design, rebates, final product selection or site-specific installation requirements.
Disclaimer: This calculator provides general estimates only and should not be relied on as a guaranteed financial outcome, quote, engineering assessment or final system recommendation. Results are based on the information entered, simplified modelling and average solar production assumptions.
Actual results can vary depending on roof orientation, shading, weather, seasonal variation, system design, inverter selection, battery settings, usable battery capacity, export limits, DNSP requirements, tariff structure, controlled load tariffs, demand tariffs, metering configuration, installation requirements, rebates, finance terms and changes to electricity prices or feed-in tariffs.
GI Energy accepts no liability for decisions made based on this estimate. A final recommendation should be based on a proper assessment of your property, electricity usage, tariff, goals and site conditions.