Free calculator

Solar payback calculator

See how long a solar or energy upgrade might take to pay for itself, and whether financing it leaves you ahead each year.

Worked out only in your browser; nothing is sent or saved. We do not publish rates or fees: use the ones from your own quote.

From your installer's quote

Only ones you have confirmed for your system

Your own estimate, or the installer's

Only if financing. Blank means 0%

What these numbers mean
  • The big number is simple payback: the cost after rebates divided by the yearly saving on your bill.
  • Simple payback leaves out interest, price changes and upkeep.
  • If you use a loan, ahead or behind shows whether the yearly saving covers the yearly repayments while the loan runs.

Good to know

  • The saving is your own estimate and stays the same every year here. Energy prices, use and system output change over time.
  • Rebates differ by place and change often. Enter only the amount you have confirmed for your own system.
  • Maintenance, battery or inverter replacement and any feed-in income are not counted unless you include them in the saving.
  • This is a guide only, not a quote, an offer of finance, a borrowing limit or financial, legal or tax advice.

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