Solar panels can be used to harness the infinite reservoir of energy from the sun to some other kind of usable energy. Generally the converted energy will be in the form of heat (to heat water for example) or electricity which might be used to energize anything from a small pda to a whole home.In this commentary I am going to talk about the bigger residential and industrial panels that are designed to generate electricity for the entire home or business, where these panels are usually installed on the top of the building or close to the structure if space allows. We are also going to concentrate our discussion on the type of panels that generate electricity known as Photovoltaic cells.Solar panels are a wonderful way to reduce energy costs and to cut your greenhouse gas footprint, and to become more self-sufficient. Solar Panels are now becoming extremely popular in inner-city areas where alternative electricity advocates and law makers are creating incentives for this safe and quiet alternative power source. The state of Utah, for example, has been offering massive rebates on the up-front expense in acquiring and installing a residential solar system.After the system is up and running, power from the solar unit is used to power the home, or, when power is being generated that exceeds what is being used, diverted back to the grid, where it is procured back by the power provider. There will actually be instances when you are making income from your panels. With rebates figured into the cost it will generally take from 16 to twenty-three years to recoup the initial investment, at which time you will essentially be generating electricity from sunlight for free.One little-considered fact, however, is that solar panels are, at first, contributory to greenhouse emissions due to the fact that it requires energy to construct the solar panel, that this energy is most often carbon-based, and front-end loaded, and that therefore there is a time horizon during which the solar panel has actually added to carbon emissions rather than subtracted from them. Until the solar panel has produced power equivalent to the power used to manufacture it (its fossil-emission payback period) it is actually a net contributor to greenhouse emissions. This fossil-emission payback period is normally considered to be 5 to ten years.Low power panels are generally available in 12 v or 14 volt configurations, whilst most high power solar panels are only available in 24 volt. As solar panels are Direct Current, you would normally need a power inverter that uprates the voltage from low-voltage Direct Current into another-voltage AC to make it the same as the power that enters the house and the power grid.The current generation of solar panels are constructed using twin sheets of silicon, in combination with phosphorus and boron atoms. High-tech Amorphous silicon solar cells are a highly powerful, emerging line of photovoltaics that differ in voltage, wattage, structure, and production than traditional photovoltaics that use crystalline silicon. The H-AS solar cells are constructed in a similar way, but they are made merely 1 micrometer thick by laying down polymorphous silicon at intense pressures and temperatures. Solar panels are generally maintenance free and many manufacturers will give a warranty of electrical output often for as long as twenty years.Solar panels are generally installed on whichever side of your house gets the maximum solar exposure. In those locales south of the equatorial line this is the north-facing aspect, and in places north of the equator its the south-facing aspect.