Savings calculator · Worked example

Solar and battery for a $1800 quarterly power bill in Brisbane

For a typical household paying $1800 a quarter in Brisbane (4122), the system that pays back best is 9.98 kW solar + 52 kWh battery: $21,095 after rebates, about $6,638 saved in the first year, paid for itself in 3.1 years and $57,945 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 + 52 kWh battery

21 × JA Solar DeepBlue 4.0 Pro 475W N-Type Double Glass Monofacial (JAM54D40-475/LR) + GoodWe 54kWh 10kW 1-phase

Price after rebates
$21,095
Saving in year one
$6,638
Pays for itself in
3.1 years
Ahead after 10 years
$57,945

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

Solar only: the lowest outlay

7.6 kW solar

16 × JA Solar DeepBlue 4.0 Pro 475W N-Type Double Glass Monofacial (JAM54D40-475/LR) + SolaX 7.5kW SP Hybrid Inverter (2 MPPT)

Price after rebates
$4,630
Saving in year one
$3,204
Pays for itself in
1.4 years
Ahead after 10 years
$33,659

On 1st Energy · 1st Emerald - Single Rate, plan checked 26 October 2026

Another battery to compare

9.98 kW solar + 44 kWh battery

21 × JA Solar DeepBlue 4.0 Pro 475W N-Type Double Glass Monofacial (JAM54D40-475/LR) + GoodWe 45kWh 10kW 1-phase

Price after rebates
$18,639
Saving in year one
$6,500
Pays for itself in
2.8 years
Ahead after 10 years
$55,224

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

How this was worked out

  • A $1800 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

$1500 a quarter$1600 a quarter$1700 a quarter$1900 a quarter$2000 a quarter$2100 a quarter

$1800 in Western Sydney$1800 in Melbourne