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 average solar energy system size in the U.S is approximately 5 kilowatts (kW). Based on the average price of $3.16/watt, a 5kW system would cost $11,060 after tax credits. Below are some average 2017 quotes for other solar energy systems by size: 6kW solar energy system cost: $13,300.