How This Solar Map Estimator Works
Solar electricity generation varies significantly depending on where you live. A rooftop in Arizona receives nearly twice the usable sunlight as one in Scotland. This estimator uses region-specific solar yield data—the amount of electricity (in kWh) that a typical 1 kW solar system actually produces in a year at your location.
When you select a location and enter your available roof area, the tool calculates how many panels of your chosen type physically fit, determines the total system size in kilowatts, and multiplies by the local yield factor. It then applies adjustments for roof orientation, shading, panel spacing, and system losses to give you a realistic annual generation estimate.
From Rough Estimate to Real Quote
This map estimator gives you a solid starting point for understanding your solar potential. It helps you answer the basic question: "Is it worth investigating solar for my home?" If the estimated generation and savings look promising, the next steps are straightforward:
- Use our full Solar Estimator to get a more detailed analysis including costs, payback period, and 25-year projections.
- Get 2–3 quotes from local certified installers who can survey your actual roof.
- Compare quotes on equipment quality, warranty terms, and total installed price—not just the headline figure.
Understanding Solar Yield by Region
Solar yield—measured in kWh per kW installed per year—is the single most important factor in estimating how much electricity your panels will produce. Here are typical ranges for the countries we support:
| Country | Typical Yield Range | Best Regions |
|---|---|---|
| United States | 1,200–1,750 kWh/kW | Southwest (AZ, NV, NM) |
| United Kingdom | 800–1,000 kWh/kW | Southern England |
| Canada | 1,000–1,350 kWh/kW | Prairies (AB, SK) |
| Australia | 1,300–1,700 kWh/kW | Queensland & NT |
| New Zealand | 1,150–1,450 kWh/kW | Northland & Auckland |
| Ireland | 800–950 kWh/kW | Southeast (Wexford) |