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Projection — predict the return on your solar investment.

See what your solar system will save you, and when it pays for itself. Set five simple numbers and Corrente works out the rest — no system needed.

Five numbers

Move the sliders, see the answer

Solar payback comes down to a few numbers. Move the sliders and your savings and profit update straight away. Nothing to connect — try it before you buy.

Input 1 — Generation

What your system makes

Set how much energy your panels produce each year.

Input 2 — Time

Over how many years

Look ahead up to 30 years.

Input 3 — Self-consumption

How much you use yourself

Energy you use at home is worth more than energy you export, so this has the biggest effect on your return.

Input 4 — Import rate

Your grid rate

What each unit you use yourself is worth — the price you'd have paid the grid.

Input 5 — Export rate

Your feed-in rate

What you earn for the surplus you send back.

The return

Savings and payback

Corrente adds up your savings, takes off the install cost, and shows when you break even.

Property value

Solar adds to your home's value

Homes with solar sell for about 1.3% more. Corrente adds that in too.

Research: solar is increasing home values in New Zealand →

Investment status

When you're in profit

Savings plus added home value, against what you paid. See if it's paid for itself yet.

Corrente's Projection screen: sliders for projection period, yearly generation, and self-consumption; a generation breakdown of total, self-consumed, and exported energy; editable import and export rates; self-consumed and export savings totalling a lifetime figure; install cost and balance remaining; house value with a solar value boost and estimated value increase; and an In Profit investment status.

Try it yourself

Nothing to connect — the Projection screen works on its own, so you can plan before you buy. Free in the TestFlight beta.

Join the TestFlight beta Requires iOS 18