Solar Panel Size Calculator
Determine the perfect solar panel system size for your energy needs. Calculate required panel area, system capacity, and number of panels.
Solar System Requirements
Ready to Go Solar?
Get a personalized quote from our solar experts tailored to your specific needs and location.
877-796-5799Call This Number To Get A Quote Tailored To Your Needs
Frequently Asked Questions
Our calculator provides estimates based on standard solar panel performance and typical system losses. For precise calculations, we recommend consulting with a solar professional who can assess your specific location, roof angle, shading, and other factors.
Peak sun hours represent the equivalent number of hours per day when solar irradiance averages 1,000 watts per square meter. This accounts for variations in sunlight intensity throughout the day. Most locations in the U.S. receive between 3-6 peak sun hours daily.
Key factors include: your energy consumption, geographic location (sunlight availability), roof orientation and tilt, shading from trees or buildings, panel efficiency, and system losses (inverter efficiency, wiring, etc.). Our calculator accounts for the most significant variables.
You can find average peak sun hours for your location through solar radiation maps or databases like the National Renewable Energy Laboratory’s (NREL) PVWatts Calculator. As a general guide: Northeast: 3-4, Midwest: 4-5, Southwest: 5-6, California: 5-7 hours.
Yes, by using higher efficiency panels (which generate more power in the same space) or by reducing your energy consumption through efficiency improvements. Higher wattage panels (400W+ vs standard 300W) can also reduce the total number needed.