For the initial evaluation, the PV system sought would
provide an electrical output of 100,000 kWh per year,
and weigh no more than 5 lbs/ft2. Several different PV
system proposals have been made matching these
requirements, including both silicon flat panel systems
(with a maximum efficiency of ~18%) and a CPV
system using multi-junction III-V solar cells and twoaxis
sun-tracker (with an efficiency of ~32%). Overall,
the 100 kWp CPV system was judged to be the “best”
available solution for several reasons: