OnePower turns your address and power bill into a physics-accurate estimate: your new weekly bill, yearly savings, and the year your system pays for itself. Built on real New Zealand climate data — not a ball-park quote.
Get my free estimate → See how it worksNo spreadsheets, no pushy quotes. The estimate engine simulates every hour of the year on your roof.
Drop a pin on the map and trace your roof. We read shading, tilt and orientation from satellite elevation data.
Type your yearly kWh and your tariff rates — straight off any power bill. Monthly detail is optional.
Your projected new bill, yearly savings, and payback period — modelled hour-by-hour across a full year.
One clean page you can share with the family — or your installer.
Side-by-side weekly cost with solar and a battery, using your actual tariff.
The year your system starts making money, and 10-year cashflow outlook.
Take the summary to an installer and compare their quote against honest physics.
Win the quote before the competitor finishes their site visit. Generate a branded, physically-credible estimate at the kitchen table, keep each customer's projects in their own space.
Open the estimator →Questions about the estimator, or want a pilot for your solar business?
Email [email protected] — based in Auckland, New Zealand.