Solar and Battery Calculator Sydney 2021

Solar and Battery Savings and Payback Calculator Sydney 2021

On this page, I have done some calculations using the SolarQuotes Solar and Battery Payback Calculator. System sizes calculated both with and without a battery (Tesla Powerwall 2) are 3kW, 6.6kW, 10kW, 15kW and 20kW.

These calculations can help you estimate possible yearly electricity bills with solar power and battery storage. See how solar could affect your electricity usage during different times of the year, find solar system payback times and see if installing batteries is the right option for you.

To complete these calculations, I have entered the postcode for Paramatta 2150 as its reasonably central to Sydney. It's safe to say that the results would be almost identical for most Sydney suburbs.

All the calculations listed below have the same default input values. For a more precise result based on your own location and needs, please click on the button below and input your own values.

Solar and Battery Calculator

Default values:
  • North facing solar panels.
  • Solar panels mounted at 22°.
  • Grid supplied electricity cost per kWh inc GST: 29c.
  • Annual electricity bill: $1420.00.
  • Daily electricity supply charge: 0.81c.
  • Solar feed-in tariff rate per kWh: 0.16c.
  • Battery type: Tesla Powerwall 2, 13.5 kWh.

3kW Solar Power Systems in Sydney

3kW Solar with 3kW String Inverter

  • System installation cost: $3,000 fully installed after solar rebate.
  • Your first year's savings: $957.
  • 10-year savings: $10,385.
  • 20-year savings: $22,114.
  • IRR:33.91%.
  • Payback time: 3 years and 1 month.
  • Yearly self-consumption: 44% of solar used, 56% exported to the grid.
  • Seasonal self consumption: Summer 50%, Autumn 41%, Winter 45%, Spring 38%.

Includes an inverter replacement at the 12-year mark. The replacement cost is $855 ($600 for the unit and $255 for 3% inflation).

 

3kW Solar with 3kW String Inverter and 13.5kWh Tesla Powerwall 2

  • System installation cost: $19,000 fully installed after solar rebate.
  • Your first year's savings: $1,171.
  • 10-year savings: $13,225.
  • 20-year savings: $29,677.
  • IRR: 8.02%.
  • Payback time: 14 years and 2 months.
  • Yearly self-consumption: 81% of solar used, 19% exported to the grid.
  • Seasonal self consumption without batteries: Summer 47%, Autumn 38%, Winter 42%, Spring 35%.

Includes an inverter replacement at the 12-year mark. The replacement cost is $855 ($600 for the unit and $255 for 3% inflation).

Seasonal Electricity Bills for 3kW Solar in Sydney

Summer 3kW Solar in Sydney

  • Solar with batteries: $21 DEBIT.
  • With solar: $63 DEBIT.
  • Without solar: $358 DEBIT.

Autumn 3kW Solar in Sydney

  • Solar with batteries: $64 DEBIT.
  • With solar: $128 DEBIT.
  • Without solar: $328 DEBIT.

Winter 3kW Solar in Sydney

  • Solar with batteries: $163 DEBIT.
  • With solar: $226 DEBIT.
  • Without solar: $416 DEBIT.

Spring 3kW Solar in Sydney

  • Solar with batteries: $1 DEBIT.
  • With solar: $47 DEBIT.
  • Without solar: $318 DEBIT.
3kw solar energy generation Sydney
MonthkWh Produced
January 453 kWh
February 395 kWh
March 357 kWh
April 327 kWh
May 254 kWh
June 260 kWh
July 278 kWh
August 334 kWh
September 403 kWh
October 455 kWh
November 440 kWh
December 462 kWh

6.6kW Solar Power Systems in Sydney

6.6kW Solar with 5kW String Inverter

  • System installation cost: $6,600 fully installed after solar rebate.
  • Your first year's savings: $1,782.
  • 10-year savings: $18,630.
  • 20-year savings: $38,005.
  • IRR: 27.86%%.
  • Payback time: 3 years and 8 months.
  • Yearly self-consumption: 20% of solar used, 80% exported to the grid.
  • Seasonal self cunsumption: Summer 25%, Autumn 20%, Winter 23%, Spring 19%.
  • Includes an inverter replacement at the 12-year mark. Replacement cost is $1,426 ($1,000 for the unit and $426 accounting for 3% inflation).

 

6.6kW Solar with 6kW String Inverter and 13.5kWh Tesla Powerwall 2

  • System installation cost: $22,600 fully installed after solar rebate.
  • Your first year's savings: $2,040.
  • 10-year savings: $22,043.
  • 20-year savings: $47,092.
  • IRR: 10.33%.
  • Payback time: 10 years and 3 months.
  • Yearly self-consumption: 40% of solar used, 60% exported to the grid.
  • Seasonal self consumption without batteries: Summer 25%, Autumn 20%, Winter 23%, Spring 19%.

Includes an inverter replacement at the 12-year mark. Replacement cost is $1,426 ($1,000 for the unit and $426 accounting for 3% inflation).

Seasonal Electricity Bills for 6.6kW Solar in Sydney

Summer 6.6kW Solar in Sydney

  • Solar with batteries: $220 CREDIT.
  • With solar: $180 CREDIT.
  • Without solar: $358 DEBIT.

Autumn 6.6kW Solar in Sydney

  • Solar with batteries: $115 CREDIT.
  • With solar: $53 CREDIT.
  • Without solar: $328 DEBIT.

Winter 6.6kW Solar in Sydney

  • Solar with batteries: $44 CREDIT.
  • With solar: $56 DEBIT.
  • Without solar: $416 DEBIT.

Spring 6.6kW Solar in Sydney

  • Solar with batteries: $241 CREDIT.
  • With solar: $197 CREDIT.
  • Without solar: $318 DEBIT.
6.6kw solar energy generation Sydney
MonthkWh Produced
January 974 kWh
February 847 kWh
March 779 kWh
April 718 kWh
May 560 kWh
June 572 kWh
July 611 kWh
August 735 kWh
September 875 kWh
October 984 kWh
November 949 kWh
December 992 kWh

Solar and Battery Calculator

10kW Solar Power Systems in Sydney

10kW Solar with 9kW String Inverter

  • System installation cost: $10,000 fully installed after solar rebate.
  • Your first year's savings: $2,602.
  • 10-year savings: $26,822.
  • 20-year savings: $53,245.
  • IRR: 26.35%.
  • Payback time: 3 years and 10 months.
  • Yearly self-consumption: 13% of solar used, 87% exported to the grid.
  • Seasonal self consumption: Summer 15%, Autumn 12%, Winter 13%, Spring 11%.

Includes an inverter replacement at the 12-year mark. Replacement cost is $2,566 ($1,800 for the unit and $766 accounting for 3% inflation).

 

10kW Solar with 9kW String Inverter and 13.5kWh Tesla Powerwall 2

  • System installation cost: $26,000 fully installed after solar rebate.
  • Your first year's savings: $2,860.
  • 10-year savings: $30,243.
  • 20-year savings: $62,351.
  • IRR: 11.91%.
  • Payback time: 8 years and 9 months.
  • Yearly self-consumption: 26% of solar used, 74% exported to the grid.
  • Seasonal self consumption without batteries: Summer 16%, Autumn 13%, Winter 14%, Spring 12%.

Includes an inverter replacement at the 12-year mark. Replacement cost is $2,566 ($1,800 for the unit and $766 accounting for 3% inflation).

Seasonal Electricity Bills for 10kW Solar in Sydney

Summer 10kW Solar in Sydney

  • Solar with batteries: $468 CREDIT.
  • With solar: $431 CREDIT.
  • Without solar: $358 DEBIT.

Autumn 10kW Solar in Sydney

  • Solar with batteries: $286 CREDIT.
  • With solar: $225 CREDIT.
  • Without solar: $328 DEBIT.

Winter 10kW Solar in Sydney

  • Solar with batteries: $202 CREDIT.
  • With solar: $103 CREDIT.
  • Without solar: $416 DEBIT.

Spring 10kW Solar in Sydney

  • Solar with batteries: $484 CREDIT.
  • With solar: $442 CREDIT.
  • Without solar: $318 DEBIT.
10kw solar energy generation Sydney
MonthkWh Produced
January 1,509 kWh
February 1,316 kWh
March 1,191 kWh
April 1,089 kWh
May 847 kWh
June 866 kWh
July 925 kWh
August 1,115 kWh
September 1,344 kWh
October 1,516 kWh
November 1,467 kWh
December 1,539 kWh

Solar and Battery Calculator

15kW Solar Power Systems in Sydney

15kW Solar with 13kW String Inverter

  • System installation cost: $15,000 fully installed after solar rebate.
  • Your first year's savings: $3,789.
  • 10-year savings: $38,726.
  • 20-year savings: $75,996.
  • IRR: 25.33%.
  • Payback time: 4 years and 0 months.
  • Yearly self-consumption: 9% of solar used, 91% exported to the grid.
  • Seasonal self cunsumption: Summer 10%, Autumn 8%, Winter 9%, Spring 8%.

Includes an inverter replacement at the 12-year mark. Replacement cost is $3,707 ($2,600 for the unit and $1,107 accounting for 3% inflation).

 

15kW Solar with 13kW String Inverter and 13.5kWh Tesla Powerwall 2

  • System installation cost: $31,000 fully installed after solar rebate.
  • Your first year's savings: $4,038.
  • 10-year savings: $42,022.
  • 20-year savings: $84,769.
  • IRR: 13.55%.
  • Payback time: 7 years and 6 months.
  • Yearly self-consumption: 18% of solar used, 82% exported to the grid.
  • Seasonal self cunsumption without batteries: Summer 10%, Autumn 8%, Winter 9%, Spring 8%.

Includes an inverter replacement at the 12-year mark. Replacement cost is $3,707 ($2,600 for the unit and $1,107 accounting for 3% inflation).

Seasonal Electricity Bills for 15kW Solar in Sydney

Summer 15kW Solar in Sydney

  • Solar with batteries: $817 CREDIT.
  • With solar: $777 CREDIT.
  • Without solar: $358 DEBIT.

Autumn 15kW Solar in Sydney

  • Solar with batteries: $536 CREDIT.
  • With solar: $473 CREDIT.
  • Without solar: $328 DEBIT.

Winter 15kW Solar in Sydney

  • Solar with batteries: $434 CREDIT.
  • With solar: $333 CREDIT.
  • Without solar: $416 DEBIT.

Spring 15kW Solar in Sydney

  • Solar with batteries: $830 CREDIT.
  • With solar: $786 CREDIT.
  • Without solar: $318 DEBIT.
15kw solar energy generation Sydney
MonthkWh Produced
January 2,264 kWh
February 1,973 kWh
March 1,786 kWh
April 1,634 kWh
May 1,271 kWh
June 1,298 kWh
July 1,388 kWh
August 1,672 kWh
September 2,016 kWh
October 2,274 kWh
November 2,201 kWh
December 2,308 kWh

Solar and Battery Calculator

20kW Solar Power Systems in Sydney

20kW Solar with 17kW String Inverter

  • System installation cost: $20,000 fully installed after solar rebate.
  • Your first year's savings: $4,977.
  • 10-year savings: $50,632.
  • 20-year savings: $98,748.
  • IRR: 24.82%.
  • Payback time: 4 years and 0 months.
  • Yearly self-consumption: 7% of solar used, 93% exported to the grid.
  • Seasonal self cunsumption: Summer 8%, Autumn 6%, Winter 7%, Spring 6%.

Includes an inverter replacement at the 12 year mark. Replacement cost is $4,848 ($3,400 for the unit and $1,448 for 3% inflation).

 

20kW Solar with 17kW String Inverter and 13.5kWh Tesla Powerwall 2

  • System installation cost: $36,000 fully installed after solar rebate.
  • Your first year's savings: $5,215.
  • 10-year savings: $53,800.
  • 20-year savings: $107,185.
  • IRR: 14.82%.
  • Payback time: 6 years and 10 months.
  • Yearly self-consumption: 13% of solar used, 87% exported to the grid.
  • Seasonal self cunsumption (without batteries): Summer 8%, Autumn 6%, Winter 7%, Spring 6%.

Includes an inverter replacement at the 12 year mark. Replacement cost is $4,848 ($3,400 for the unit and $1,448 for 3% inflation).

Seasonal Electricity Bills for 20kW Solar in Sydney

Summer 20kW Solar in Sydney

  • Solar with batteries: $1,166 CREDIT.
  • With solar: $1,129 CREDIT.
  • Without solar: $358 DEBIT.

Autumn 20kW Solar in Sydney

  • Solar with batteries: $786 CREDIT.
  • With solar: $725 CREDIT.
  • Without solar: $328 DEBIT.

Winter 20kW Solar in Sydney

  • Solar with batteries: $667 CREDIT.
  • With solar: $568 CREDIT.
  • Without solar: $416 DEBIT.

Spring 20kW Solar in Sydney

  • Solar with batteries: $1,176 CREDIT.
  • With solar: $1,134 CREDIT.
  • Without solar: $318 DEBIT.
20kw solar energy generation Sydney
MonthkWh Produced
January 3,019 kWh
February 2,631 kWh
March 2,381 kWh
April 2,178 kWh
May 1,694 kWh
June 1,731 kWh
July 1,850 kWh
August 2,230 kWh
September 2,688 kWh
October 3,031 kWh
November 2,934 kWh
December 3,077 kWh

Solar and Battery Calculator


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