Solar panels degrade slowly, losing about 0. 5% output per year, and often last 25–30 years or more. 5 kWh of energy per day, depending. Solar panels convert sunlight into electricity through photovoltaic (PV) cells. The amount of electricity generated depends on several factors, including the panel's efficiency, the amount of sunlight received, and the installation location. If you're thinking about going solar, one of your biggest questions is likely: how much electricity can a solar panel actually produce? This in-depth guide. Environmental factors cause 70% of solar production issues: Weather, shading, and dirt accumulation are the most common culprits behind reduced solar output, making regular monitoring and maintenance essential for optimal performance.