Calculator
Check the payback on a quote you have already been given.
We will not invent a price to make this look good. Put in the figure from any quote, ours or someone else's, and this tells you what it actually pays back at your tariffs.
- Works on any quote
- Your tariffs, your numbers
- Compare quotes fairly
Your numbers
Fill in the price on your quote and what you pay for power and your feed-in tariff and your answer appears here.
Nothing here is sent to us. The maths runs in your browser, and there is no email gate.
Still needed
- The price on your quote
- What you pay for power
- Your feed-in tariff
These come off your electricity bill. We ask for them rather than guessing, which is the entire point of this tool, and the reason the answer will be about your house rather than an average one.
What this assumes, in full.
Every calculator makes assumptions. Most sites hide theirs, because naming them makes the headline number look less impressive.
- 01Simple payback, with no discounting of future cash flows and no allowance for tariff changes.
- 02Generation uses your state capital's approximate peak sun hours and a performance ratio of 0.80.
- 03Panel degradation is not modelled. Most manufacturers warrant around 0.5 percent loss a year, so later years produce slightly less.
- 04It assumes the price you entered is the price after any rebate. If your quote shows the rebate separately, subtract it first.
- 05Inverter replacement toward the end of the period is not included.
FAQ
Payback, answered.
If the numbers here do not match what a salesperson told you, ask them which assumption they used.
Get a Free QuoteBecause a price that ignores your roof, your switchboard, your access and your rebate eligibility is not a quote, it is bait. We will give you a real figure in writing once we know those things.
Yes, and we would encourage it. If a quote looks poor against your own tariffs, that is worth knowing before you sign, whoever wrote it.
It varies with your usage pattern and tariffs, which is exactly why we would rather you calculated yours than read an average off a website. What we will say is that a very long payback usually means the system is not matched to the household.
The other tools
Get started
Ready for a lower power bill?
Send us your address and a recent bill. Here is exactly what comes back.
- A fixed, itemised price, not a range
- Every rebate you qualify for, applied for you
- A design built on your roof and your real usage
- No pushy sales visit, ever
