CalSol's first solar vehicle, California Dreamin', was built by team members between the summers of 1990 and 1993.

This vehicle first competed in Sunrayce '93, an intercollegiate race of student built solar powered vehicles that stretched more than a thousand miles between Arlington, Texas and Minneapolis, Minnesota. It then ran in the 1994 Disneyland World Clean Air Road Rally, a three-day race of alternative-fueled vehicles that extended 90 miles across Southern California.

In August, 1995 California Dreamin' competed in the 1995 Suzuka Solar Car Race in Japan.