As my daughter pointed out, attention to the details of Harry Potter's world is also patchy. (1) As everybody knows, the Gryffindor Quidditch team includes several girls. As far as we could tell, all the players in this game are represented as boys. That is a huge demerit for this father of a daughter.
Pricing for Solar Photovoltaic (PV) Systems. Generally, Solar PV systems that generate electricity from sunlight cost between $1.95 to $6 per installed watt. Typically, the larger the system, the lower price per watt. Large commercial systems are typically well below $3 per watt. Residential systems, because of their smaller size are usually somewhat higher.
The installed price of distributed solar power fell by 40 cents per watt for U.S. residential and small-scale photovoltaic (PV) systems between 2013 and 2014, while large nonresidential systems saw costs fall by an average of 70 cents per watt, according to new Energy Department data released this week.