 The price for the home charging units is US $ 490 plus installation costs . The Voltec is a home @-@ charging unit built by SPX for Volt owners . It is a 240 @-@ volt ( Level II ) charger , and , according to General Motors , can replenish the Volt 's batteries in about four hours . Consumer Reports has advised buyers to budget up to US $ 2 @,@ 000 , as many older homes may need a substantial electrical upgrade because the U.S. National Electrical Code requires that the charger have its own dedicated 220 @-@ volt , 30 @-@ amp circuit . Early buyers can benefit from the federal tax credit available for charging equipment . 
