**6. Summary of the chapter**

In the current photovoltaic market, with dominating share of single-junction solar cells, the highly efficient concentrated photovoltaic systems (CPV), utilizing third-generation multi-junction solar cells, have yet to exploit their market potential due to their design complexities. The conventional CPV module design utilizes individual concentrator for each MJC. This chapter has introduced a novel design of CPV concentrating assembly where single concentrator can handle four MJCs, named as multicell concentrating assembly (MCA). Such proposed design will not only reduce the overall cost of the system, but it will also reduce the assembly and alignment efforts during CPV module fabrication.

In this chapter, a detailed design of such multicell concentrating assembly is discussed and explained. For prototype purpose, the detailed calculation of concentrating assembly size is presented for concentration ratio of ×165. Such proposed design is transformed into working prototype of CPV module for actual field testing. The design was targeted to handle angular deviations of 1° without any loss in performance.

A detailed performance investigation strategy was adopted to verify the proposed design with its prototype and its limitation during field operation. An optical simulation was conduction in TracePro to verify the optical performance of MCA. An equal division and uniform distribution of rays were observed at the outlet apertures of homogenizer. From the field testing, equal and uniform power output of each MJC verified the proposed design of multicell concentrating. However, to analyze the response of MCA against angular deviation of incident ray, normalized power output curve was presented against angular deviation, for both experimental and simulated performances. The system showed 100% power output for angular deviations up to 1°, as designed. However, the system showed maximum capability of handling 6.5° angular deviations. A great agreement was observed among simulated and experimental results.
