SOLAR STORAGE CALCULATOR

Use our solar battery storage calculator if you already own a solar system and you are investigating storage options. If you don’t already have solar panels, use our solar system calculator.

1

Household Details

This tells us know how many sunlight hours hit your existing solar array throughout the year.
Enter the amount of your household daily electricity usage in kWh. If you are unsure how much this is, you can find it on your last electricity bill.
2

Existing solar system details

1.5kW
10kW
5kW
What is the size of your existing solar panel system? This will tell us how much solar power your system generates.

How much electricity is used during the day between 8am - 6pm each day?

10%
100%
50%
This is an important component of the storage calculation. This tells us how much of your electricity is directly powered from your solar panels, and how much excess solar energy is available to charge your solar battery. The lower the % of electricity use during daylight hours, the greater the reliance on battery stored power.
3

Battery storage options

1.2kWh
28kWh
5kWh
Use the battery toggle to select your desired battery size. The average cost of the battery will populate below and you give you an idea of how much the solar battery costs in relation to storage capacity.
Battery cost OR control these variables
4

Property Details

Is your roof subject to shading or obstruction?

Select the amount of daylight hours your panels lose through shading or obstruction.

0 hours

0.5 hours

1 hours

1.5 hours

2 hours

2.5 hours
Estimate the angle of your roof. This will help us form a more accurate idea of your existing solar generation.
Tell us the direction that your solar array faces.
5

Finance Options

Do you want to finance your solar battery and pay nothing upfront?

It is possible to finance your solar storage solution. If you wish to take out a solar loan for your battery purchase and pay nothing upfront, select either the add to mortgage or the solar loan button.
$0 UpfrontPay cash upfront $0 UpfrontAdd to mortgage $0 UpfrontGet a solar loan
advanced-options-icon

ADVANCED OPTIONS

This is the rate at which you sell your excess power back, that isn’t to be stored, back to the grid. You can read more about feed in tariffs here.
The rate you pay for your electricity from the national grid.
Unless you are planning to go off the grid, you will still have to pay a daily supply charge to access the electricity grid.
We estimate this to be around 5%. You are welcome to change this figure, be aware that altering it, especially higher, can greatly improve your solar storage savings.
It’s best to factor the slight deterioration in performance that your system is likely to experience.
The best warranty you are likely to find for solar batteries is 10 years. It may be that your battery last much longer, however, we’d prefer to give go with a figure that the manufacturer’s can guarantee.
Set default options
Calculate

YOUR SOLAR BATTERY RESULTS

$0

Annual Savings
annual-battery-savings-icon

0

Payback Period
payback-period-icon

$0

Battery Cost
solar-battery-cost-icon

0%

Return On Investment
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0.0 Daily kWh

Daily
solar
generated

0.0Daily kWh

Battery
stored
power

0.0Daily kWh

Direct
solar
power

0.0Daily kWh

Fed back
into
grid

Electricity bill comparison

$0 Without battery
$0 With battery
$0 Lifetime Savings

SOLAR BATTERY

  • Battery capacity0 kW

  • Solar battery cost$0,0

  • Assumed Warranty0 years

Your electricity

  • Battery powered0.0 kW

  • Solar powered0.0 kW

  • Fed back into gird0.00 kW

Battery savings

  • Annual battery savings$0

  • Lifetime battery savings$0.0

  • Payback period0.0 years

  • Return on investment0.0%

Disclaimer

This solar battery calculator is indicative only. It is provided to give an estimate only and general guide of the potential savings, costs and benefits of installing a solar battery. You can read the full calculator disclaimer here.

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Variables affectingsolar storage

Solar storage is potentially a great option for existing solar panel owners. The financial viability of the battery will depend on your individual circumstances, for example: the size and generation capacity of your current solar system, the amount of electricity you use and your usage habits during daylight hours.

The Australian population uses more electricity during the peak morning and evening periods. Depending on the season, your solar system is not likely to be producing energy during these periods. So you have to purchase it from the grid.

The economics behindsolar storage

At the heart of the solar storage equation is what happens with the excess solar energy you produce during daylight hours. For solar panel owners that do not have a storage solution, any excess power is fed straight back into the grid, where your retailer will pay you a financial credit per kWh. Then at night when you need to purchase power from the grid, your retailer will then sell it back to you at a higher rate; the greater the difference between these two rates the more viable buying a battery is. However, in recent years, higher feed-in tariffs means that adding a battery isn’t as attractive as it once was.

However, in recent years, the disparity between the buy back rate and the cost of electricity has remained stable, despite rising electricity costs; meaning that solar batteries are only economically viable in some cases.

payback and longevity economics of battery storage

The cost of solarbattery storage

The cost of solar storage has come down markedly in recent times, and the trend is set to continue. Technological and manufacturing developments like Tesla’s Powerwall battery are driving prices down and making solar battery storage more viable. Costs may vary significantly between suppliers.

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