A fresh report from the Energy Efficiency and Conservation Authority (EECA) shows solar power in New Zealand is delivering strong financial returns. For households in Wellington, that means solar is now a smarter investment than ever. Here’s a guide to what matters most if you’re considering solar panels for your home in 2025.
1. Roof Orientation & Shade – the Biggest Factor
- North-facing roofs: Generate the most energy, up to 20% more compared to east or west.
- East & west still work: A good option to spread generation across the day.
- Shade check: Invest in modern solar panel technology designed to perform even in partial shade.
2. Roof Angle – Nice to Optimise, Not Critical
- EECA recommends around 30° tilt.
- Most Kiwi homes perform well with panels parallel to the roof.
- Flat roofs may need angled frames, but this adds cost.
3. System Size – Why Bigger Can Be Better
- Slightly oversize panels vs. inverter (e.g., 6 kW panels with 5 kW inverter) for up to 10% more annual output.
- Great for smaller roofs wanting maximum efficiency.
4. Sunshine vs. Power Prices – The Real Return Driver
- High electricity prices in Wellington mean solar pays off faster.
- EECA research shows returns of 6%–14% annually depending on usage and tariffs.
- Pair solar with a suitable energy plan for even better returns.
5. Exporting Solar Power – More Room on the Grid
- New regulations lifting the old 5 kW export limit to 10 kW in many regions.
- Larger systems can now send more energy back to the grid.
- Ideal if you want to charge EVs or run a heat pump.
6. Price & Warranty – What You Control
- A competitive install price directly boosts returns.
- Look for 25+ year performance warranties for peace of mind.
- Choose a trusted installer with local support.
Key Takeaways for Wellington Homeowners
- North-facing roofs are best, but east/west still deliver good returns.
- Oversizing panels helps maximise efficiency.
- Power prices in Wellington = faster payback.
- Export limits are improving, making bigger systems worthwhile.
- Warranties matter – invest in quality gear that lasts.
👉 Free Solar Assessment for Your Wellington Home
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