Solar Payback Dapto NSW: 2026 Worked Example | Kratos Energy

Solar Payback in Dapto: A 2026 Worked Example

If you are considering solar in Dapto NSW 2530, one of the most useful questions is:

How long will the system actually take to pay for itself?

There is no single payback period that applies to every Dapto home.

Your result depends on the system price, electricity consumption, solar generation, how much solar you use directly, your electricity tariff and the feed-in tariff paid for exported energy.

This guide uses a clearly labelled hypothetical 6.6kW Dapto household to show how solar payback can be calculated.

It is a financial model—not a measured Kratos customer result and not a savings guarantee.

For broader NSW solar costs, rebates and generation assumptions, see the Kratos Energy NSW Solar Guide.

Solar Payback in Dapto: Quick Answer

Using the worked assumptions below, our example produces:

Important: These are illustrative assumptions using Kratos' September 2026 website pricing and NSW reference rates. Your actual Dapto payback may be shorter or longer.

Why Solar Payback Matters in Dapto

Dapto has a housing profile where residential rooftop solar can be particularly relevant.

According to the 2021 Census, approximately 84.7% of occupied private dwellings in Dapto were separate houses. Around 57.1% had three bedrooms, while another 27.1% had four or more bedrooms. (Australian Bureau of Statistics)

That does not tell us how much electricity an individual household uses.

But it reinforces why solar payback should be calculated from the actual home's bill and usage pattern, rather than from a generic national average.

A three-bedroom home with daytime occupancy and air conditioning may achieve very different solar savings from another home where everyone is away during daylight hours.

The Solar Payback Formula

The simplest calculation is:

Simple Payback Period = Net Solar Cost ÷ Annual Solar Benefit

For example:

$3,990 ÷ $1,827 = 2.18 years

Rounded:

Approximately 2.2 years

But the important part is understanding how the $1,827 annual benefit was calculated.

Dapto Worked Example: The Assumptions

1. Solar System Cost

For this worked example, we use a 6.6kW residential solar system.

As of September 2026, Kratos Energy lists its 6.6kW package from $3,990 including GST and after the applicable STC rebate. The current package includes around 14 × 475W panels and a 5kW inverter. (Kratos Energy)

You can review the current system here:

Kratos 6.6kW Solar System

Model system cost:

$3,990

This price is used purely as the starting input for this example. Site conditions, switchboard work, roof access, equipment selection and other requirements can change the final quote.

2. Estimated Solar Generation

Kratos' current NSW guide uses approximately 4.1kWh of solar generation per installed kW per day around the Sydney/NSW reference area.

For a 6.6kW system, it gives an indicative annual generation figure of approximately:

9,877 kWh per year

Actual output depends on:

• Roof orientation

• Roof pitch

• Shading

• Weather

• Equipment

• System losses

(Kratos Energy)

For Dapto postcode 2530, homeowners can also enter their postcode into the Kratos Solar Output Calculator for a location-based estimate.

Model generation:

9,877 kWh/year

3. Household Electricity Consumption

For this example, assume the Dapto household uses:

20 kWh per day

Annual consumption:

20 × 365 = 7,300 kWh/year

This is an assumption—not an average for every Dapto household.

The correct figure for your home should come from your electricity bills or smart-meter data.

4. Grid Electricity Rate

Kratos' current NSW solar guide uses approximately:

32 cents per kWh

as an indicative NSW grid electricity rate. (Kratos Energy)

Your actual tariff may differ depending on:

• Retailer

• Electricity plan

• Time-of-use tariff

• Controlled load

• Discounts

• Demand charges

Model grid rate:

$0.32/kWh

5. Feed-In Tariff

For this model, we use:

5 cents per kWh

for electricity exported to the grid, matching the indicative NSW rate currently used by Kratos. (Kratos Energy)

Your retailer may offer a different feed-in tariff.

Model feed-in rate:

$0.05/kWh

6. Solar Self-Consumption

This is one of the most important payback assumptions.

Solar electricity used directly in your home avoids buying electricity at the full retail tariff.

Solar exported to the grid earns only the feed-in tariff.

For this worked example, assume the household directly consumes:

50% of solar generation

Solar generation:

9,877 kWh/year

Self-consumed:

9,877 × 50% = 4,938.5 kWh

Exported:

9,877 − 4,938.5 = 4,938.5 kWh

Calculating the Annual Solar Benefit

Now we can calculate the two financial benefits separately.

Savings From Self-Consumed Solar

Each self-consumed kilowatt-hour avoids buying electricity at 32c.

4,938.5 kWh × $0.32

= $1,580.32 per year

Income From Exported Solar

The remaining electricity is exported at 5c/kWh.

4,938.5 kWh × $0.05

= $246.93 per year

Total Estimated Annual Benefit

Add the two values:

$1,580.32 + $246.93

= $1,827.25 per year

Rounded:

~$1,827 annual benefit

This result is very close to the current Kratos indicative saving of approximately $1,800/year for its 6.6kW package. (Kratos Energy)

Solar Payback Calculation

Now divide the system cost by annual benefit:

$3,990 ÷ $1,827.25

= 2.18 years

So under these specific assumptions:

Estimated Simple Payback: ~2.2 Years

Again, this is a worked financial model, not a guarantee that every 6.6kW solar system in Dapto will pay back in 2.2 years.

What Happens to the Electricity Bill?

The same model can be viewed from the bill perspective.

Before Solar

Annual electricity consumption:

7,300 kWh

Energy cost:

7,300 × $0.32

= $2,336/year

After Solar

Solar used directly:

4,938.5 kWh

Remaining grid imports:

7,300 − 4,938.5

= 2,361.5 kWh

Grid-energy cost:

2,361.5 × $0.32 = $755.68

Feed-in tariff:

4,938.5 × $0.05 = $246.93

Approximate net variable electricity cost:

$755.68 − $246.93

= $508.75/year

Difference:

$2,336 − $508.75

= $1,827.25/year

This model excludes fixed daily supply charges because those generally remain whether or not the property has solar.

The Biggest Payback Factor: How Much Solar You Use Yourself

The same 6.6kW system can produce very different financial results depending on self-consumption.

Using the same system price, generation and tariffs:

This demonstrates why solar payback is not determined by system size alone.

The more solar electricity you use directly, the more each kWh is worth.

Why Self-Consumption Is Worth More Than Exporting

In this model:

1 kWh used in the home:

Worth approximately 32c

1 kWh exported:

Worth approximately 5c

So using solar directly can be worth more than six times as much as exporting the same electricity under these assumptions.

This is why households can improve solar economics by operating flexible appliances during daylight hours.

Examples include:

• Washing machine

• Dishwasher

• Pool pump

• Heat-pump hot water

• EV charging

• Air conditioning

Instead of:

Generate solar → export at 5c → later buy electricity at 32c

the home can:

Generate solar → use it directly → avoid buying at 32c

What If Your Electricity Rate Is Different?

Grid tariffs materially affect solar payback.

Keeping all other assumptions unchanged:

Higher retail electricity prices increase the value of each self-consumed solar kilowatt-hour.

This is why you should use the actual tariff from your electricity plan rather than relying only on an online average.

What Could Make Dapto Solar Payback Longer?

The simple example above assumes a reasonably productive, well-used system.

Real payback can be longer if:

• The roof has significant shade

• Panels face less productive directions

• Household daytime consumption is low

• Electricity tariffs fall

• Feed-in tariffs are lower

• Additional installation work increases the upfront cost

• Finance interest or fees are included

• System production is lower than modelled

• Equipment requires unexpected maintenance

• Export restrictions affect the proposed design

A solar proposal should therefore show both expected generation and expected financial savings.

What Could Improve Solar Payback?

Solar economics can improve when a household:

• Uses more electricity during daylight hours

• Shifts pool-pump operation to daytime

• Runs appliances while solar is generating

• Charges an EV from daytime solar

• Has a strong north, east or west roof layout

• Minimises unnecessary shading

• Selects the right system size for its actual consumption

A bigger solar system is not automatically better.

The best financial return generally comes from matching generation to household demand.

Does the STC Rebate Affect Payback?

Yes.

The current Kratos package price used in this example is already shown after the federal STC solar rebate.

Kratos' 2026 NSW guide estimates that a typical Zone 3 6.6kW system may generate approximately 45 STCs, worth around $1,710 using an illustrative $38 certificate value. STC values vary and final entitlement is confirmed at installation. (Kratos Energy)

Because the rebate lowers the upfront solar cost, it shortens the simple payback period.

Do not add the rebate to the annual savings again if the quoted system price already has the STC discount deducted.

A Note About Dapto's Electricity Network

Dapto is within the Illawarra area serviced by Endeavour Energy; Endeavour's published network planning documents specifically identify the Dapto network region. (Endeavour Energy)

That matters because system design and export capacity need to satisfy the applicable network connection requirements.

For a payback calculation, do not assume that every excess kilowatt-hour can necessarily be exported under every connection arrangement.

Your installer should confirm the site's connection and export conditions before finalising the financial model.

Should You Use a Solar Payback Calculator?

Yes—but only if you enter realistic inputs.

A useful calculator should allow you to test:

• Solar system size

• System cost

• Electricity bill

• Solar generation

• Retail electricity tariff

• Feed-in tariff

• Self-consumption

Kratos Energy's Solar Savings & Payback Calculator lets homeowners model estimated annual savings and payback across different residential system sizes. It clearly states that results are estimates and actual savings depend on usage, tariff, feed-in rate and site conditions. (Kratos Energy)

Dapto Solar Payback Checklist

Before accepting a solar savings estimate, check that the calculation includes:

If one of these inputs is unrealistic, the payback result can also be unrealistic.

Frequently Asked Questions

Calculate Solar Payback for Your Dapto Home

For a home in Dapto NSW 2530, payback should be calculated using your actual electricity profile—not a generic savings claim.

Start with:

System price + annual generation + household usage + self-consumption + grid tariff + feed-in tariff

Then test how the result changes if any of those assumptions change.

The worked example above shows why a 6.6kW system can achieve a relatively short simple payback when a household uses a meaningful share of its solar generation directly.

But the correct result for your property depends on your roof, electricity bill and daily usage pattern.

View the Kratos 6.6kW solar system

Calculate your solar savings and payback

Request a tailored Kratos solar quote

Good solar payback starts with transparent assumptions—not a promised savings number.