Nowadays the fixed assessment of the PV panel end life is subjective, because of the lack on enough databases mandatory for probabilistic methods such as Monte-Carlo method. Hence, a controlled accelerated degradation is conducted according the ICE Std protocol. The aging varies from PV panel type to another and from a region to another. Defining the life cycle of PV panels is very important for waste recycling treatments industry. In fact it seems that the increase in the amount of waste PV panels should be early. Where, the industry that supports this waste remains undeveloped. In this paper the aging evolution is expressed and the weather effect is highlighted. An economical investigation is done for an optimal photovoltaic power plant PV panels life cycle base on measurements at each time, because each PV panel has its own aging evolution. And a solution to reduce the eminent high quantity of declassed PV panels by giving a second life to these PV panels is proposed.