1. Your household's energy use
2. Solar system size
3. Home battery
4. Your current rates (optional)

Yearly bill before solar

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Yearly bill after solar

–incl. daily supply charges

Savings in year 1

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Your yearly electricity bill

Both bills include daily supply charges from your energy retailer. These are a fixed cost for being connected to the grid, and solar panels and batteries don't cover them.

Estimated savings over 25 years

–bill savings + feed-in credits
How we calculate this estimate
  • Electricity at your price (30c/kWh if left blank), rising 2% a year, plus daily supply charges of $1.20/day, which solar and batteries don't cover.
  • Feed-in tariff at your rate (4c/kWh if left blank), falling 10% a year. Feed-in credits are counted only up to your usage charges, so your bill never drops below the daily supply charges.
  • About 1,400 kWh of output per kW of panels a year in Brisbane, dropping 0.5% a year as panels age.
  • Without a battery, solar covers just under half your usage (the daytime part). With a battery sized to your household, solar covers up to 90% of your usage, less 10% lost charging and discharging.
  • Exports limited to 5 kW for systems up to 13.2 kW (single-phase connection). The 19 kW system assumes a three-phase connection, which allows 15 kW.
  • Doesn't include the system or battery price, financing or inverter replacement. Figures aren't adjusted for inflation.

This is an estimate, not a quote. Actual savings depend on your tariff, roof, shading and when you use power.