Wow, that is completely false! There was an article a few months ago about how most Chevy Volt owners just use a standard 120 V household outlet to charge overnight. That is because you can fully charge the car in 10 hours using such an outlet, even less if you didn't use the entire 40 mile range the day before. (78% of Americans drive less than 40 miles a day to and from work, and 51% drive less than 20 miles[1], so this is likely.)
Furthermore, your $4,000 price for 240 V home chargers is total baloney. Prices are between $500 and $1,000.
The fact is, almost all charging is done at night, in people's garages, when there is no strain on the grid.
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The price of the hardware for the standard car charger is $1100.
Installation depends on how far from the branch panel it has to be run. The permit is usually $1500 or more. $4000 is about average for the total.
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