Solar & Battery Pricing for New Zealand Design, Cost & Payback Calculator
Design solar and battery systems across New Zealand using Photonik's professional design platform. New Zealand enjoys good solar potential, particularly in the upper North Island and the sunny Nelson-Marlborough region. With electricity prices continuing to rise, more Kiwi homeowners are discovering that solar panels can deliver meaningful savings and greater energy independence.
Solar Planning & Design
To size your system, start with two questions: how much electricity you use, and how much roof space you have.
1. Energy usage
The average New Zealand household uses around 18–20 kWh of electricity per day, or roughly 7,000 kWh per year, though this varies by region and household size. Electric hot water cylinders — found in most Kiwi homes — account for a large share of daily usage. Winter demand is higher due to heating, shorter days, and increased hot water use, while summer consumption drops. Usage also varies regionally, with Southland homes averaging around 22 kWh daily compared to 17 kWh in the upper North Island. We start with your daily energy usage because it determines how large a solar system you need to offset a meaningful share of your power bill.
Note: These are simplified estimates. For detailed tariff inputs and advanced calculations, use the full Photonik app.
Representative flat export rate (feed-in tariff). What you earn per kWh of surplus solar exported to the grid. Your actual rate depends on your provider, plan, and time of day.
Estimated at 75% of the retail grid rate. A battery lets you store daytime solar and export during expensive peak hours, so each exported kWh is typically worth more than a flat feed-in tariff. Real returns depend on your time-of-use tariff and battery efficiency.
2. How many panels can fit on your roof?
How many panels fit depends on your roof type and orientation. A typical 3-bedroom New Zealand home has 25–40 m² of usable north-facing roof, fitting 8–14 panels (3–5.5 kW). Single-storey homes — common throughout the country — often have generous roof area for solar. Hip roofs reduce usable space compared to gable designs, and obstructions like skylights, flues, and whirlybird vents take up panel space. Panels should ideally face north in the Southern Hemisphere, though east-west split arrays are increasingly popular for matching morning and evening usage patterns.
New Zealand homes are predominantly roofed with long-run metal (Colorsteel or similar), which is ideal for solar mounting using rail-less clamp systems with no roof penetrations required. Concrete and clay tiles are also found on older homes and work well with hook-and-bracket mounting. Typical roof pitches of 20–30 degrees are close to optimal for solar generation at New Zealand latitudes. Installations must comply with AS/NZS 5033 for PV array safety, AS/NZS 4777 for inverter and grid connection requirements, and must be completed by a registered electrician. Grid connection requires approval from your local lines company.
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This is a simplified panel layout tool — if you hit issues here, or need multiple groups, shading, or generation calcs, use the full Photonik design tool.
System sizing New Zealand
System Costs
The overall price of a solar and battery system depends on equipment quality, installation complexity, and any available rebates or incentives.
Estimated price
Solar prices in New Zealand have come down significantly in recent years — a 9.9 kW system now costs around $14,577, making the economics more attractive than ever. After the 7.3-year payback period, your solar system continues producing — at current rates, that's potentially 15+ years of savings with minimal maintenance costs.
Pricing includes equipment, labour, and taxes. Use the sliders to adjust system size and battery capacity, observing how changes impact total cost and payback.
Tiers follow the same scale as the Photonik app. Browse the panel product directory.
Rebates & incentives
New Zealand does not have a national solar rebate or grant program for residential installations. However, several major banks offer green loan products with favourable terms — Westpac offers up to $50,000 interest-free for five years, while ANZ and BNZ offer up to $80,000 at 1% interest over three years. EECA (the Energy Efficiency and Conservation Authority) supports community-scale solar projects and offers some funding through the Warmer Kiwi Homes programme. For most homeowners, the investment case rests on displacing grid electricity at 28–35c/kWh with solar power that costs around 8–12c/kWh over the system lifetime.
Payback
Simple payback is the system price divided by annual savings. The price side depends on equipment quality, installation complexity, and rebates. The savings side depends on your electricity usage, the buy rate per kWh, and the feed-in tariff for exported energy.
Simple payback calculation
Electricity rates & feed-in tariffs
New Zealand residential electricity rates are typically 28–35c/kWh (NZD), making self-consumed solar energy valuable. There is no government-mandated feed-in tariff — retailers set their own buy-back rates, which typically range from 7–17c/kWh depending on your retailer and plan, with some time-of-use tariffs paying more during evening peaks. The gap between what you pay for power and what you receive for exports means self-consumption saves roughly twice as much as exporting. With no national rebate program available, payback relies primarily on displacing expensive grid power, making batteries worthwhile for households that use most of their electricity outside solar hours.