Design of Point-Focus Back Panel Including Cell, Mounting, Encapsulant, and Interconnect

摘要

An attempt has been made to develop a passively-cooled, integral backplane (IBP) photovoltaic concentrator module in which silicon cells are bonded directly to the backplane of the module to eliminate the ceramic insulator and heatspreaders normally used. Over 2200 volts electrical standoff was achieved using a heat-conductive RTV and a special anodization. The module design is bent sheet metal trough with two panels of 14, 8.16-inch square Fresnel lenses mounted on the front. The cells were purchased from Applied Solar Energy Corporation (ASEC), with an active area of 0.71-inch diameter, giving a concentration ratio of 168:1. A reflective secondary was used. The average efficiency of the cells flash tested at 140 suns was 19.5%. Efficiency of the modules at 800 W/m exp 2 insolation, 20 deg C ambient temperature, and 3 m/S windspeed was about 12.5%. Cell junction temperature was found to be about 90 deg C under the above conditions. (ERA citation 11:022311)