The volume of a prism is the product of the area of the base and the distance between the two base faces, or the height (in the case of a non-right prism, note that this means the perpendicular distance).
In 2017, most homeowners are paying between $2.87 and $3.85 per watt to install solar, and the average gross cost of solar panels before tax credits is $16,800. Using the U.S, average for system size at 5 kW (5000 watts), solar panel cost will range from $10,045 to $13,475 (after tax credits). Thatâs nine percent lower than it was a year ago, and solar panel system costs are continuing to fall.
The cost of a metal roof tends to range between $500 a square for lower-end metal material to $1,800 for higher-end copper roofs. The average homeowner usually selects corrosion-resistant metal priced between $700 and $1,000 per square. A natural slate tile roof can cost between $800 and $1,600 per square.