World Solar Challenge is an Amazing Adventure in Engineering – Renewable Energy World

Event Director Chris Selwood said the decision was made to reduce the solar array from 6 to 4 square meters because the challenge was about being more efficient with the use of power rather than travelling the fastest. In 2007, the size was reduced to 6sq m from the 8sq m originally allowed in 1987.

Source: World Solar Challenge is an Amazing Adventure in Engineering – Renewable Energy World