Car2Go has solar panels on the roofs of a good number of the gasoline powered Smartcars in their fleet. This helps to keep the cars' battery from wearing down w

Car2Go has solar panels on the roofs of a good number of the gasoline powered Smartcars in their fleet. This helps to keep the cars' battery from wearing down while powering the onboard cellular data and GPS. The panel however is promoted as only 100W which is enough for this purpose but wouldn't go far in terms of locomotive power, and it seems that newer models have forgone PV in favor of moonroofs and regular (presumably more durable) rooftops.