Investigation of the changes in the electrical parameters of solar panels with the passage of operation time

After several years of using solar cells, its electrical parameters are degraded. in this paper, to simulate aging, cells were exposed the different doses gamma radiation. The (I–V) characteristics silicon studied before and after irradiation. Experimental results showed that parameter panel such as short circuit current, open voltage, efficiency decrease with increase doses. As well as, dependence Voc Isc according absorbed dose for illumination levels has been investigated.