Savings Insights
Estimate your solar payback, financing, and long-term carbon impact.
We model a typical 6.6 kW system using nationwide irradiance data, conservative self-use assumptions, and mainstream retail and export tariffs. These are directional estimates only— adjust the calculator to reflect your own usage profile, loan terms, and installation costs.
- Illustrative system
- 6.6 kW rooftop PV
- Estimated install cost
- $12,210
- Year-one bill reduction
- $2,365
- Self-consumed energy
- 6,283 kWh
- Exported energy
- 2,957 kWh
Figures use blended Auckland, Wellington, and Christchurch irradiance data, a 68% self-consumption ratio, and a baseline household usage of roughly 7,600 kWh per year. Use the calculator below to overwrite these assumptions for your situation.
Personalise these estimates for your household.
Tweak the sliders to reflect your power bill, system size, and finance preferences. We apply mainstream tariffs and export credits, but your lines company, retailer plan, and roof specifics may vary.
- Bill slider assumes blended day/night tariff of 32c per kWh.
- Self-use ratio reflects homes with daytime occupancy plus smart hot water control.
- Export credit defaults to 12c per kWh, aligned with major NZ retailers.
- Household usage baseline is capped at roughly 7,600 kWh per year to prevent overestimating self-consumption.
Calculator outputs are indicative and exclude maintenance, inverter replacements, or tariff changes. Treat results as a starting point before requesting a tailored feasibility study.
Savings calculator
Adjust the sliders to test different system sizes, bill levels, and finance options based on mainstream New Zealand rates.
- Estimated install cost
- $12,210
- Annual solar production
- 9,240 kWh
- Bill reduction (year one)
- $2,365
- Simple payback
- 5.2 years
- Net monthly savings*
- $16
- Ten-year net impact*
- $8,424
*Net figures factor in loan repayments using the interest and term inputs provided. Actual finance terms, tariffs, and consumption patterns will alter the outcome.
Ready for a site-specific feasibility study?
We will model irradiance, structural considerations, and export limits for your address, then provide a tailored proposal with finance options.