Does The Solar Power Car Exist? The technology exists and efficiency of the solar cell moves the solar powered vehicle closer to the showroom.
There are big plans for the production of the solar powered car and all that's needed is a little more tweaking of the solar cell.

As the efficiency of the solar cell improves the likelihood of a solar powered vehicle entering the marketplace heightens.
Current solar power car prototypes operate like regular cars with the addition of a battery pack that can contain any of a number of battery types including Lithium ion batteries and Lithium polymer batteries. Also, a power electronics system monitors how much energy is being gathered, how much is being used, and controls the amount of energy stored in the battery pack.
A data acquisition system provides drivers with information about battery power, energy intake, and other important information needed to keep the car moving.
The mechanical system also differs from traditional cars in that many prototype solar cars only have three wheels. Suspension systems are similar to those found in gas-powered cars, but may include a trailer-arm rear suspension, usually used on motorcycles. Steering systems need to be in perfect alignment in order to minimize power loss. Brake systems that rely on disc brakes are often used to reduce drag.
Basically, it comes down to the size of solar cells and how much electricity can be squeezed out of each cell. The very same issues that plague residential solar power. Every ounce of weight that the car is expected to propel must be compensated for by the number of solar cells upon the car.
This is not to say that these limitations are insurmountable. Not at all. However, until a smaller solar cell is able to produce more power it's unlikely that you'll be seeing a pod of solar power cars in the grocery store parking lot.
The sunrayces have very adeptly demonstrated the future possibilities of solar powered vehicles. Cars produced for these races (pictured above) that span the US and Canada are sleek and beautiful. Sporting solar cells on every exposed surface the vehicles can reach speeds in excess of 65 miles per hour.
Another method of using solar energy to power an electric car has been proven by the participants of the solar decathlon.
Excess power that's produced by these solar houses is fed to a small electric car which makes it a solar powered vehicle without solar panels.
As solar cells become more efficient the total area of solar panel that a solar power car requires will be reduced. Thin film photovoltaic technology will also play a huge role toward the development of the solar powered family car.