Is your roof solar ready? Across New Zealand, solar panels are becoming an increasingly popular way to generate electricity. As a result, businesses and homeowners are increasingly asking whether their roof is suitable for solar installation.
Key Factors That Determine Solar Suitability
1. Roof Orientation
In New Zealand, north-facing roofs receive the most direct sunlight and produce the most solar energy. However, east and west-facing roofs also perform well and are suitable for solar installation — particularly when combined with modern monitoring and optimiser technology. South-facing roofs in New Zealand receive the least sun and are generally less suitable.
2. Roof Pitch
The ideal roof pitch for solar panels in most New Zealand locations is 15–40 degrees. However, solar panels can be installed on roofs anywhere from flat (0°) to very steep pitches using appropriate mounting systems. Flat roofs often use tilt frames to achieve optimal angles.
3. Shading
Shading from trees, chimneys, or neighbouring buildings significantly impacts solar performance. Even partial shading of one panel can reduce the output of the entire string of panels connected to it (with standard inverters). A site assessment will identify shading issues and — where necessary — recommend micro-inverters or DC optimisers to mitigate the impact.
4. Roof Age and Condition
Solar panels are installed for 25+ years and it's important that your roof can support this commitment. If your roof is nearing the end of its life or requires significant repair, it's worth addressing this before installing solar. A new roof with solar installed simultaneously often delivers efficiencies in cost and disruption.
5. Roof Material
Most roof materials are suitable for solar installation, including:
- Colorbond and corrugated metal (excellent)
- Terracotta and concrete tiles (very common, well-supported)
- Slate and specialised materials (requires experienced installer)
6. Structural Capacity
Solar panels add weight to your roof (approximately 10–15 kg per panel). In most cases, standard roof structures easily support this load. For older homes, a structural assessment may be warranted. EFS Solar's installs conform to all New Zealand Standards.
7. Available Space
A 6.6kW system requires approximately 35–45 m² of suitable roof space. If your roof has multiple aspects or obstacles, a qualified designer can plan the system to make the best use of available area.
Get a Free Roof Assessment
The easiest way to find out if your roof is solar ready is to book a free site assessment with EFS Solar. Our team will evaluate all the relevant factors and design an optimal system for your specific roof. Contact us today to get started.