The only emissions associated with PV power generation are those the production

of its components. After their installation they generate electricity the solar

irradiation without emitting greenhouse gases. In their lifetime, which is around 25

years, PV panels produce more energy than that for their manufacturing [2]. Also they

can be installed in places with no other use, such as roofs and deserts, or they can

produce electricity for remote locations, where there is no electricity network. The latter

type of installations is known as off-grid facilities and sometimes they are the most

economical alternative to provide electricity in isolated areas.-The only emissions associated with PV power generation are those　the production

of its components. After their installation they generate electricity　the solar

irradiation without emitting greenhouse gases. In their lifetime, which is around 25

years, PV panels produce more energy than that for their manufacturing [2]. Also they

can be installed in places with no other use, such as roofs and deserts, or they can

produce electricity for remote locations, where there is no electricity network. The latter

type of installations is known as off-grid facilities and sometimes they are the most

economical alternative to provide electricity in isolated areas.