Savings calculator · Worked example

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

For a typical household paying $1800 a quarter in Melbourne (3150), the system that pays back best is 9.5 kW solar + 52 kWh battery: $20,876 after rebates, about $6,819 saved in the first year, paid for itself in 2.9 years and $58,368 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

9.5 kW solar + 52 kWh battery

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

Price after rebates
$20,876
Saving in year one
$6,819
Pays for itself in
2.9 years
Ahead after 10 years
$58,368

On Red Energy · Red Power5, 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
$3,358
Pays for itself in
1.2 years
Ahead after 10 years
$35,811

On MYOB powered by OVO · The One Plan - OCT2026, plan checked 26 October 2026

Another battery to compare

9.98 kW solar + 45 kWh battery

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

Price after rebates
$21,519
Saving in year one
$6,469
Pays for itself in
3.2 years
Ahead after 10 years
$52,661

On Red Energy · Red Power5, plan checked 26 October 2026

How this was worked out

  • A $1800 quarterly bill, turned into daily use at typical Victoria rates for postcode 3150.
  • 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 VIC. 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 Brisbane