Development of a low cost integrated 15 kW AC solar tracking subarray for grid connected PV power system applications

The Utility Power Group has reduced the installation cost of grid connected photovoltaic power systems through a two step approach of integrating and packaging all sub-array power conversion and control functions within a single factory produced enclosure and utilizing large area factory assembled photovoltaic panels. A modular 15 kW AC single axis solar tracking sub-array was designed to meet the requirements of Article 690 of the 1996 National Electrical Code and eight prototype sub-arrays are under construction in Sacramento, California for the Sacramento Municipal Utility District. This paper presents general design information and describes the cost savings associated with the utilization of an integrated approach to PV system cost reduction.