DEVELOPMENT of a PROTO-TYPE PV DECK-SHADING SYSTEM

摘要

A PV deck-shading system has been designed for pre-wiring and pre-fabrication techniques to increase quality control of factory production and reduce site labour costs. The system has a wider range of applications but is customised to suit the 7.5m × 9.6m planning grid of Hong Kong (HK) Schools. Performance under high wind-load has been a critical factor in the design necessitating wind tunnel measurements and module wind-load capacity tests. The robust, lightweight and low-maintenance system is particularly designed for latitude 22° where high altitude sun and close-spacing of modules can maximize summer electricity yield with 33% increased module area. The system is suited to 330 × 1300mm dimensioned modules, Copper Indium Diselenide technology and particularly the ST40 module from Siemens Solar. The system consists of factory fabricated trusses supporting paired strings of modules. Each truss interlocks to the preceding truss through the hub which also contains the customised junction-box. Rapid-tooling process has developed the design to facilitate local small-scale production of the customized junction-box. The system and its electrical components are intended as starters to the development of a local PV components industry.