PV Array Sizing Tool
Calculate the perfect solar panel system size for your energy needs. Get instant results for required panel area, system capacity, and number of panels based on your location and energy requirements.
PV Sizing Frequently Asked Questions
What are peak sun hours?
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 US receive between 3-6 peak sun hours daily.
How do system losses affect my PV array size?
System losses (typically 14-25%) account for real-world inefficiencies like temperature effects, wiring losses, inverter inefficiency, and soiling. Higher losses mean you’ll need a larger system to meet your energy needs.
Can I reduce the number of panels needed?
Yes, by using higher efficiency panels (22%+) or increasing your panel wattage (400W+), you can reduce the total number of panels needed. However, these premium panels often cost more per watt.