We present a static concentrator system made up of refractional units for changing slanted sunlight to vertical light. The
refractional units are cylindrical and were placed to face the sun over Taipei. We used meteorological data from the
Central Weather Bureau in Taipei to define the collecting range of our system. Based on the vignetting effect and the loss
of sunlight, we discuss the configurations of refractional units and compare their performances. For evaluating the
performances, we define a parameter to evaluate the refracting capability.