How Electric Cars Will Boost Solar Charge it? Possible costs for a Chevrolet Volt and a 4 kW solar-power array in 2011: $40,000Cost of Volt-$7,500Federal tax credit$32,500Volt's cost to the buyer$18,500Cost of 4 kW solar array, after incentives$51,000Total cost of Volt and solar system$6,000Down payment$45,000Financed at 5.5% interest for 7-year term$646.66Monthly payment for Volt and solar system-$182.50Monthly fuel savings (at 19 mpg and $3 per gallon vs. 38 miles a day of electric-only driving)-$26.46Additional potential monthly savings on electrical bill, at 2009 average California residential ratePossible result:$437.70Estimated monthly cost for 84 months for a new Volt and a 4 kW solar array, including fuel savings and potential electricity savings
