Savings calculator · Worked example

Solar and battery for a $1200 quarterly power bill in Brisbane

For a typical household paying $1200 a quarter in Brisbane (4122), the system that pays back best is 9.98 kW solar + 29 kWh battery: $11,792 after rebates, about $4,427 saved in the first year, paid for itself in 2.6 years and $40,209 ahead after ten. Worked out 26 October 2026 on current prices, rebates and electricity plans.

Work it out for your own bill

The three worth comparing

Best over ten years

9.98 kW solar + 29 kWh battery

21 × JA Solar DeepBlue 4.0 Pro 475W N-Type Double Glass Monofacial (JAM54D40-475/LR) + ESY 30.7kWh 10kW 1-phase

Price after rebates
$11,792
Saving in year one
$4,427
Pays for itself in
2.6 years
Ahead after 10 years
$40,209

On COVAU PTY LIMITED · SolarMax QLD Energex Residential TOU, plan checked 26 October 2026

Solar only: the lowest outlay

6.65 kW solar

14 × JA Solar DeepBlue 4.0 Pro 475W N-Type Double Glass Monofacial (JAM54D40-475/LR) + Kstar All in One 5.0kW Single Phase Hybrid Inverter

Price after rebates
$4,212
Saving in year one
$2,218
Pays for itself in
1.9 years
Ahead after 10 years
$22,076

On GloBird Energy · FULLHOUSE Residential (Flexible Energy)-Energex, plan checked 26 October 2026

Another battery to compare

7.6 kW solar + 29 kWh battery

16 × JA Solar DeepBlue 4.0 Pro 475W N-Type Double Glass Monofacial (JAM54D40-475/LR) + ESY 30.7kWh 6kW 1-phase

Price after rebates
$10,112
Saving in year one
$4,264
Pays for itself in
2.3 years
Ahead after 10 years
$39,317

On MYOB powered by OVO · The Free 4 Plan, plan checked 26 October 2026

How this was worked out

  • A $1200 quarterly bill, turned into daily use at typical Queensland rates for postcode 4122.
  • A typical household's day: no answers about pools, air conditioning or an electric car. Yours can change the answer, so the calculator asks.
  • Every system size the roof and the grid connection allow, with and without each battery we install, priced after the federal battery rebate and solar STCs.
  • Each system on the retail plan that saves it the most, from every plan published for the postcode.
  • Installed by Sunbridge Energy QLD. An estimate, not a quote: a site inspection and your real bill give exact figures.

Other bills

$900 a quarter$1000 a quarter$1100 a quarter$1300 a quarter$1400 a quarter$1500 a quarter

$1200 in Western Sydney$1200 in Melbourne