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How efficient are modern solar panels?
Brian Galloway for redOrbit.com – @brigallo17
Solar power is one of those topics that we see quite often. It feels like there’s a new “breakthrough” in solar technology (and a new use for graphene) every other week. So we had to ask the question– How good are modern solar panels?
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Defining terms is a great place to start. Photovoltaic solar cells convert solar energy into electricity. These cells are placed into a protective casing that forms what’s called a “module”, as shown by the Florida Solar Energy Center.
This distinction is important for our purposes because efficiency is lost when forming cells into modules. “Efficiency” in this context refers to the amount of electricity generated per unit of solar energy that hits the panels. Solar cells with 40% efficiency don’t necessarily form modules that provide the same level of power output. Words matter–pay attention to the language articles use when talking about solar power.
Residential applications
SunPower is one of the largest companies in the solar panel market, and they produce panels for homes, businesses, and utilities. Their residential “E-Series” panels boast 20.4% efficiency, as taken from this data sheet about the product line.
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This information took a little bit of digging to get to, probably because leading with “Our product is 20% efficient!” isn’t the best slogan for a marketing campaign. This efficiency is at the top of the market for residential solar panels, but it just doesn’t sound that great.
Surely 20% isn’t the best we can do!
Residential solar applications are limited by cost because most people can’t afford (and don’t need) a sea of high-tech solar panels in their back yard. Large-scale power utilities differ because there’s more money involved and a demand for higher energy output.
Many large solar farms use solar concentration to increase efficiency. These plants use special mirrors or lenses to focus the sun on a tube of liquid that produces steam and drives a turbine, according to the Solar Energy Industries Association.
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These concentration technologies increase efficiency to a range somewhere around 40% depending on environmental conditions and the specifics of a certain array, according to the International Energy Association. With an increase in performance comes an increase in cost, and these setups are extremely expensive.
Answer the question!
So the verdict: Modern solar efficiency floats around 20% for residential applications and 40% for large-scale power utility applications.
Solar power technology continues to improve just like anything else. However, cutting-edge breakthroughs can’t be implemented overnight. Breakthroughs in the lab are great, but it takes a while for the technology to reach consumer-grade hardware. Panel prices continue to drop, so do some searching if you’re interested in going green.
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Source: http://www.redorbit.com/news/technology/1113351493/how-efficient-are-solar-panels-031315/
