Document Type: Research Paper
A stand-alone photovoltaic lighting system is reported in this paper. The system uses a 70 W HPS lamp with a DC bus voltage of 12 V. An efficient electronic ballast, which makes possible the use of 70 W HPS lamp in photovoltaic applications is reported. Design of the ballast is discussed. The ballast has an efficiency of more than 87 percent for the operating load range. The performance of the HPS lamp with the electronic ballast is reported and compared with passive ballast.