The average solar energy system size in the U.S is approximately 5 kilowatts (kW). Based on the average price of $3.36/watt, a 5kW system would cost $11,760 after tax credits. Below are some average 2015 quotes for other solar energy systems by size: 6kW solar energy system cost: $15,000. 8kW solar energy system cost: $20,000.
Pros: 1  Economical option. Homeowners appreciate the sleek appearance of an asphalt-paved driveway at a lower cost than concrete or paver surfaces. 2  Flexible in extreme climate conditions. Asphalt driveways typically cost $2 - $5 per sq foot to install - more than gravel, but much less than many other options. 3  Long lifespan.
A plain concrete driveway can cost $3-$10 or more a square foot, or $900-$3,000 for 12'x25' or $2,900-$9,600 for 24'x40', depending on soil conditions; whether existing pavement needs to be removed; drainage requirements; depth of the compacted gravel base; any slopes or curves; and any features like a turn-around or retaining wall.