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The Sunpower 360watt panels (22.2% efficiency) are 1558mm x 1046mm = 1.63 sq meters. That means the 5 sq meters on the Lightyear would be 1100W. Which is a lot to fit on a car, but not impossible.
My 10kW solar panels produce as much as 68kWh in a day, so that is about 7.4kWh a day. If their 12,500 miles / year is real, that is about 218Wh / mile, which is quite believable. We average about 200Wh / mile on our e-Golf.
12,500 miles a year = 34.2 miles / day.
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