Given the U.S. consumes about 4 petawatts hours of electricity per year, It would take about 13,600,000 acres or 21,250 square miles of solar panels to meet the total electricity requirements of the United States for a year.
At face value, how is this sentence not implying something like that a car battery that gives 10 miles of range and takes up most of the weight and volume of the vehicle would be perfectly okay, if it cost $10 (including installation), and could be fully charged for 10 cents.