A 550W solar panel is a type of photovoltaic (PV) panel that can generate a maximum output of 550 watts under optimal conditions. This rating indicates the panel's capacity to convert sunlight into electricity. What Does a 550 Watt Solar Panel Produce? A 550. How many watts does a 550 solar panel have? To answer the query, a 550-watt solar panel is designed to produce 550 watts of power under ideal conditions, specifically under full sunlight, and various factors can affect actual output such as shading, temperature, and orientation. Losses come from inverter efficiency, wiring, temperature, and dirt. Increasing panel count or choosing higher wattage. Quick answer: A modern residential solar panel measures roughly 66–82 inches long, 40–45 inches wide, and 1. 6 inches thick, weighs 40–55 lb, and produces 350–460 watts. 5 kWh of energy per day, depending on local sunlight.