Solar guide
How many solar panels do I need?
Work out panel count using system size and panel wattage, with examples for common system sizes.
Estimate the number of solar panels required for your target system size or electricity usage.
Use the main calculator
The full interactive calculator is available on the homepage. This page exists to explain the specific calculation topic in more detail and to help users understand the assumptions before making decisions.
Key assumptions to check
- Your average electricity price per kWh.
- Your local feed-in or export tariff.
- Average peak sun hours for your region.
- Roof orientation, pitch and shading.
- Installed cost after incentives or grants.