Solar Power Roof Area Calculator | Roof Space Needed for a Solar
Solar Panel Wattage (W) Most residential panels are 350–450W. Check your panel specs or use an average value. Solar Panel Area (m² per panel) Standard panels are about
Solar Panel Wattage (W) Most residential panels are 350–450W. Check your panel specs or use an average value. Solar Panel Area (m² per panel) Standard panels are about 1.6–2.0 m². Enter your panel's area or use an average. Panel Placement Loss Factor (%) Accounts for gaps, shading, tilt, and access. 5–15% is typical.
Desired Solar System Power Output * (kW) How much power do you want your solar system to generate? (1 kW = 1,000 Watts) Solar Panel Wattage (W) Most residential panels are 350–450W. Check your panel specs or use an average value. Solar Panel Area (m² per panel) Standard panels are about 1.6–2.0 m². Enter your panel's area or use an average.
The average residential solar panel size is about 17.5 sq ft—though it's good to overestimate the area required as some installation space is necessary between the panels and rows. When installing 22 panels like in our example, and each panel takes up about 18 sq ft, your system would require approximately 396 sq ft of roof space.
A typical home solar panel is about 3 feet wide by 5.5 feet long, occupying an area of roughly 17.5 square feet (sq ft). On average, the amount of required roof space for a set of home solar panels is between 300 sq ft and 500 sq ft total.
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