Photovoltaic cells are semi-conductor devices that generate electricity when exposed to the sun. This type of solar technology uses the photoelectric effect and converts selected wavelengths of light into electricity.
Solar panel kits usually include all essential components that are needed for a small home solar system. They are suited to supplement energy needs, but do not provide enough electricity to power a conventional household.
Solar cell efficiency tells us the amount of solar insolation that is converted into electricity. It usually lies between 12.5 and 15%. In laboratories, scientists are working on solar cell efficiency constantly.