Free tool · No details needed
Move the sliders. We'll size a system and estimate what it saves you — per year and over its life — using real Taranaki numbers. It's a starting point; your free on-site assessment firms it up.
01 Property type
02 Your average monthly power bill
03 Roof, sun & direction
Which way does your main roof face?
04 Battery storage
05 Charging an EV?
06 When are you usually using power?
08 Fine-tune the battery size (optional)
| Taranaki solar yield | ~1,300 kWh per kW installed, per year |
| Roof direction | North ~100%, E/W ~87%, south ~70% of ideal |
| Panel size used | 475 W modules |
| Daily supply charge | ~$2.50 / day (stays after solar) |
| Self-consumption | ~27% base (mixed occupancy), higher if home in the day, up to ~85% with battery |
| Payback basis | EECA typical NZ install prices, Dec 2025 (residential) |
| Grid carbon | ~0.10 kg CO₂ / kWh |
Defaults calibrated to recent Solar One Taranaki installs. Buyback defaults to 17c/kWh, but top solar-friendly retailers (e.g. Ecotricity) pay as much as 26c/kWh — worth checking your plan, or nudging the number above. Adjust to your own tariff for a closer estimate.
Your estimate
Your export income covers 100% of your $912/yr supply charge — the fixed daily fee that stays whether you're on solar or not.
● Right-sized for your usage.
Install cost is from EECA's published typical NZ prices (Dec 2025) — an independent government benchmark, not a Solar One quote. Excludes any loan interest. Your real price comes from a free on-site assessment.
Indicative savings estimate only — based on Taranaki averages and the inputs above. It is not a quote, a guarantee, or financial advice. Real savings depend on your usage pattern, tariff, roof and final design. Your free on-site assessment confirms the numbers.
01
Use this tool for a ballpark size and savings.
02
We visit, check the roof and switchboard, and look at your real usage.
03
You get a proper proposal — sized, costed and explained, no pressure.
04
Our local crew installs, commissions and sets up monitoring.