There are a lot of different solar manufacturers, for instance; SolarWorld, Evergreen, Kyocera, Sony, BP, and SunPower to name a few.
There are two different types of photovoltaics, PV and PVL. PV is the basic type you see, with a hard thick cell. PVL, photovoltaic lament, thin film, is like solar shingles and are easy to install due to their easy peel and stick application, which makes them easier to install and lowers the installation costs.
You also have solar thermal collectors that trap water and heat it up for you water needs. http://www.energysavers.gov/your_home/water_heating/index.cfm/mytopic=12850
Also, there are solar panels to heat up your pool they look like PVL, but function completely different. http://www.energysavers.gov/your_home/water_heating/index.cfm/mytopic=13230
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