4–10¢
a typical feed-in tariff — what you're paid to export a kWh
Start from your actual power bill and get an honest size for your home — in kilowatts and panels. Then the part most solar calculators skip: how much of that power you'll actually use, and what it takes to use more.
Built the way a scientist would size it: from your actual power use, your state's real sun, and Australian field research — shown as an honest range, not false precision.
Sized on a yearly basis (the standard). Generation itself swings hard with the seasons — high in summer, roughly half in winter — so summer brings a big surplus you'll export for cents unless you use it. That's exactly what Powermind is for.
Getting the size right matters — but even a perfectly-sized system sends most of its power to the grid for cents, because it's made at noon while your home draws power morning and night. A kilowatt-hour of your own solar, used at home, is worth several times more than one exported.
So the real question isn't only what size — it's how much of it you keep. That's what Powermind is built to do: shift your hot water, car and aircon onto your surplus, automatically.
The sizing above, and the case for using your solar rather than exporting it, both rest on Australian energy research. A few of the voices behind it:
“More than half of Australian homes have an electric water heater with a storage tank — a thermal battery that often stores more energy than a home battery.”
University of New South Wales — Hot water heaters & daytime solar, 2024
“Close to 50% of water heating was successfully shifted from night to day. Most householders reported no noticeable change to their hot water service — only 0.3% of households opted out.”
UNSW SolarShift trial, 18,000 South Australian households (Yildiz & Saberi) — funded by ARENA & RACE for 2030
“Before spending $10,000+ on a battery, consider whether you can shift existing loads to solar hours. Shifting 5–10 kWh of daily load into solar hours effectively eliminates curtailment for most 6.6 kW systems — and costs nothing.”
Gridly — Australian solar export economics, 2026