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3. Results and Accomplishments PV system engineering performance and reliability testing, analyses, and reporting continued the long-term testing record at the NREL OTF. A total of eight grid-connected systems were monitored and four quarterly test reports were generated and provided to the corresponding PV industry manufacturers. The systems were the following (record starting dates are shown in parentheses): • 1.00 kWp CdTe system (June 2003) • 1.43 kWp x-Si system (Feb. 1995) • 1.43 kWp CIS system (Dec. 1998) • 1.20 kWp a-Si system (Sept. 1999) • 1.00 kWp CdTe system (July 1995) • 6.00 kWp x-Si system (May 1994) • 1.80 kWp a-Si system (Jan. 1993) • 1.00 kWp a-Si system (Oct. 1998) An example of a long-term performance analysis result is shown in Fig. 1. Each quarterly report, for each system, contains such results. Figure1:SCI11kWArray PVUSAPower Ratingvs Time ( Irr >800W/m^2andP>800W) 1200.0 1160.0 1120.0 1080.0 1040.0 1000.0 960.0 920.0 880.0 840.0 800.0 Jun-95Dec-95 Jun-96Dec-96 Jun-97Dec-97 Jun-98 Dec-98 Jun-99Dec-99 Jun-00Dec-00 Jun-01 Dec-01Jun-02 Dec-02 Jun-03 Dec-03 Jun-04 Time DCPower ACPower In September 2004, PVWATTS Version 2 was moved to a higher-speed server and modified to run on ESRI ArcIMS Version 9.0 software. On the map server, PVWATTS is a tool that may be invoked from the top-level “United States Solar Atlas” screen that shows a map of the United States with elevation shading (see Fig. 2). Fig. 2. Top-level “United States Solar Atlas” screen from which PVWATTS Version 2 is invoked. In addition to elevation shading, a new feature was added permitting the user to display a map showing values of solar radiation for any of 14 different collector orientations or types. More options have also been added for selecting the location. Besides zooming on a region of the map to select a grid cell, the user may now select a location by entering either a zip code or the latitude and longitude coordinates. PVWATTS Version 1 was updated with an option to provide hourly values of AC energy for each hour of a typical meteorological year (TMY). From the “AC Energy and Cost Savings” screen showing the results of the simulation, the “Output Hourly Performance Data” button may be clicked to display hourly performance. If desired, hourly performance results may be saved as a text file. This feature is not available for Version 2 because Version 2 results are determined with interpolations using monthly solar radiation values. FY 2004 accomplishments included critical technical updates to the NEC, UL standard 1741, and IEEE standards. Certification efforts used a two-pronged approach to include both installer and hardware certification. Drafts of the inverter performance test protocol were updated through numerous inputs from industry, academia, utilities, and standards -16.4 Wper year (-1.46%per year) -13.7Wper year (-1.36%per year)PDF Image | FY 2004 ANNUAL REPORT DOE Solar
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