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.
The Cost of Solar Panels in California. 1  The average cost of residential solar installed in California in 2015 was $18,675. As you shown in the above graph, that price varies by several thousand dollars depending on the region. These prices are solar installations purchased with a loan or cash, they do NOT apply to leased systems.