Hermann Diels popularized the term pre-socratic in Die Fragmente der Vorsokratiker (The Fragments of the Pre-Socratics) in 1903. However, the term pre-Sokratic was in use as early as George Grote's Plato and the Other Companions of Sokrates in 1865.
The cost of a solar panel today is around $3 per watt, and the extra cost of installation brings costs up to $5- $6 per watt. Note: Installation costs for PV systems include both labor and the electronics needed to tie the solar array into your existing electrical system.
For instance, say you're a homeowner in Austin, TX, who wants to install a large 7-kilowatt solar panel system. Multiply that by the national average of $3.70 per watt, and you get a total solar panel cost of $25,900. But then, factor in the city's rebate.