On average, a 10 m² solar panel system generates 1,500–2,200 watts (1. But why such a range? Three factors decide this: Panel Efficiency: Ranges from 15% (basic models) to 23% (premium PERC cells). This guide breaks down the watts generated per 10 square meters, explores efficiency factors, and shares real-world examples to help you maximize solar ROI. Based on the average conditions, it can produce around. The answer lies in something most solar salespeople never properly explain— solar irradiance and your actual energy potential per square meter. But "ideal" rarely exists. Estimates the energy production of grid-connected photovoltaic (PV) energy systems throughout the world. It allows homeowners, small building owners, installers and manufacturers to easily develop estimates of the performance of potential PV installations. Divide the solar panel wattage (for 100W, 150W, 170W, 200W, 220W, 300W.