PrISUm II was built to compete in Sunrayce 93, a collegiate competition, sponsored by GM, EDS and the U.S. Department of Energy, to build and race solar-powered vehicles from Dallas to Minneapolis in the summer of 1993. The team from Iowa State fundraised to procure materials, designed, constructed and raced the vehicle, which placed 10th out of 34 teams.
It was powered by monocrystalline silicon photovoltaic cells, which at peak sun produced 1200 Watts, enough to power a typical hair dryer and, in this case, propel the vehicle to top speeds of 55 miles per hour. This energy went into a DC brushless motor, which was also able to recover energy from slowing the vehicle down. This regenerated energy, along with excess energy produced by the solar panels was stored in a bank of lead-acid batteries carried by PrISUm II which could then power the car when needed. The structure of the car was made from welded chrome-moly, and composite panels of aramid honeycomb sandwiched by Kevlar, giving it excellent strength with low weight.
P2 was donated to Putnam Museum in Davenport, Iowa during the fall of 2016. Want to see P2 in person and all the other displays at the Putnam Museum? Be sure to check out their website!
Sunrayce 93: 10th place
Sunrayce 93 started in on June 23rd in Arlington, Texas and ended on June 26th in Minneapolis, Minnesota. PrISUm won Stage 5 of the race, finishing first in Des Moines, Iowa.