Thanks. [:)]

In France, 13 panels give 3000 WhC (maximum limit for a particular).
In 2010, a solar installation cost 17,000.00 euros (~15,500.00 dollars US).
In 2016, the same panels cost 11,000.00 euros.

2 ways for these solar panels :
1. You produce yourself your electricity or
2. You produce electricity for an electric compagny which give 2,000.00 euros per year on average. [:)]