Savings calculator · Worked example

Solar and battery for a $1900 quarterly power bill in Brisbane

For a typical household paying $1900 a quarter in Brisbane (4122), the system that pays back best is 9.98 kW solar + 52 kWh battery: $21,095 after rebates, about $6,750 saved in the first year, paid for itself in 3 years and $59,420 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
$6,750
Pays for itself in
3 years
Ahead after 10 years
$59,420

On GloBird Energy · FOUR4FREE Residential (Flexible Rate)-Energex, 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
$3,365
Pays for itself in
1.4 years
Ahead after 10 years
$35,601

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
$6,653
Pays for itself in
2.7 years
Ahead after 10 years
$57,433

On GloBird Energy · FOUR4FREE Residential (Flexible Rate)-Energex, plan checked 26 October 2026

How this was worked out

  • A $1900 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

$1600 a quarter$1700 a quarter$1800 a quarter$2000 a quarter$2100 a quarter$2200 a quarter

$1900 in Western Sydney$1900 in Melbourne