What is the most efficient solar electrical energy generator?

What is the most efficient solar electrical energy generator?
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Answer :

Solar thermal energy technology is more efficient than photovoltaics. So when you want to heat water it’s not a good idea to use electricity generated by photovoltaics. If you want to use a computer during daylight photovoltaics is a good idea. At night solar thermal energy technology can use heated oil also at night. This technology has been proposed for the Desertec project in the Sahara.
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