A 500W solar panel can produce between 1. 5 kWh per day, depending on sunlight, which is enough for small appliances. The expected solar energy is 500 Wh in one hour, but the actual conditions when you use the portable panels may not be ideal. It is possible to power devices such as smartphones, laptops, LED lamps, and even small refrigerators with a 500W panel. In areas with consistent sun exposure, the. In this guide, we'll break down three key points: how big a 500W solar panel actually is, how many amps it produces, and how many panels you really need for 500 watts of power. Losses come from inverter efficiency, wiring, temperature, and dirt.