Through photovoltaic cells, sunlight is converted into electricity. Solar panels are virtually maintenance free.They can be laid on the roof (as shingles or separate panels) or be mounted in one of the following ways:
1) on a frame that can be adjusted manually twice a year to provide maximum exposure to the angle of the sun;
2) on an active tracking device that will automatically follow the sun as it moves in the sky. Solar panels are attractive and reliable, and to the extent that the sun rises everyday, this is the global resource of choice.