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Free solar calculators — Smart Solar Energy Australia
Free Solar Tools

Solar Calculators & Tools

Five free tools to work out your rebate, savings, battery size and blackout backup — no sign-up needed.

Tool 1 of 5
Solar Panel Rebate Calculator

How many STCs your system creates and what comes off your installed price.

Step 1 · System size

6.6 kW
Most Melbourne homes install between 6.6 kW and 13.2 kW.

Step 2 · Your location

Certificates created
39
STCs
Your rebate
$1,443
off your price

STC price $37 · Zone 4 rating 1.185 · 5-year deeming 2026. Deeming drops to 4 years from 1 Jan 2027.

Tool 2 of 5
Federal Battery Rebate Calculator

Cheaper Home Batteries Program — your discount by usable capacity.

Usable battery capacity

13.5 kWh
Eligible: 5–100 kWh usable. Tesla Powerwall 3 = 13.5 kWh, Sungrow SBR = 9.6 kWh.
Federal discount
$4,050
off installed price
Current rate
$300
per kWh usable

Rate $300/kWh usable · drops to $275/kWh from 1 Jan 2027 · eligibility confirmed at quote stage.

Tool 3 of 5
Solar Savings Calculator

Annual bill savings and simple payback for a Melbourne solar system.

Step 1 · Your usage

20 kWh
Check your last electricity bill. Vic family average: 18–25 kWh/day.

Step 2 · System size

6.6 kW
6.6 kW is the most popular single-phase system size.
Annual savings
$1,144
per year
Simple payback
10.5 yr
at $12,000 cost

Tool 4 of 5
Battery Consumption Calculator

How many nights your battery covers and how much it saves you each year.

Step 1 · Your battery

13.5 kWh

Step 2 · Evening usage

8.0 kWh
A typical Melbourne home uses 8–12 kWh after 4pm.
Nights covered
1.7
nights per charge
Annual saving
$1,003
vs grid power

Tool 5 of 5
Battery Sizing Calculator

The minimum and recommended battery size based on your evening usage and backup needs.

Step 1 · Evening usage

6.0 kWh

Step 2 · Backup nights needed

2 nights
Most homes choose 1–2 nights. Grid-tied homes often choose 1.
Minimum size
12 kWh
usable capacity
Recommended
15.5 kWh
with 25% buffer

Get your fixed installed price

Send us your address and a recent bill. We confirm your roof, rebate eligibility and switchboard, then give you one price with the rebate already applied.

Book a free consultation