كم من الوقت تدوم الألواح الشمسية؟ حوالي ٢٥ سنة إلى ٨٠٪ كفاءة About 25 years to 80% efficiency. Share This Previous Post← Solar is following the same trajectory as smartphones Solar is following the same trajectory as smartphones Next PostSolar fits very well with nature → Solar fits very well with nature You May Also Like . Solar is the solution to climate change. Period View Post . Wind speed is a critical factor in solar installation View Post . Which direction should solar panels face? View Post