Abstract: . . .  500 600 700 800 900 1000 1100 1200 Wavelength (nm) A b sol u te S p ect r a l R esp on se (A /W ) Solarex mc-Si AstroPower Si-Film Page 3 [3] A. H. Fanney, M. W. Davis and B. P. Dougherty, “Short-Term Characterization of Building Integrated Photovoltaic Modules,” Proceedings of Solar Forum 2002, Reno, NV. [4] A. H. Fanney, M. W. Davis, B. P. Dougherty, D. L. King, W. E. Boyson, and J. A. Kratochvil, “Comparisons of Photovoltaic Performance Measurements,” J. Solar Energy Engineering, 128, 2006, pp. 152-159. [5] http://www.mauisolarsoftware.com Table 1. Comparison of module performance at the Standard Reporting Condition (1000 W/m 2 , AM1.5, 25 o C) using standard ASTM test procedures on multiple days at Sandia and ASU-PTL. Module Type Lab Measurement Date Isc (A) Imp (A) Voc (V) Vmp (V) Pmp (W) FF 9/14/2004 3.531 3.184 21.08 16.07 . . .
. . .  4.114 19.52 15.04 61.90 0.644 Average 4.948 4.146 19.60 15.06 62.45 0.644 Std. Dev. (%) - repeatability 0.46 0.85 0.44 0.35 0.79 0.31 AstroPower M7225 Lab Difference (%) - reproducibility +0.1 +0.4 +1.1 +1.1 +1.4 +0.3 3/14/2006 5.482 4.96 21.512 17.722 87.82 0.745 3/15/2006 5.475 4.94 21.488 17.749 87.68 0.745 Average 5.479 4.95 21.500 17.736 87.75 0.745 Std. Dev. (%) - repeatability 0.09 0.22 0.08 0.11 0.11 0.03 SunPower SPR-90-WHT-U Lab Difference (%) - reproducibility -0.7 -2.9 0.4 0.9 -2.1 -1.9 3/22/2006 3.817 3.538 67.442 53.382 188.873 0.734 4/19/2006 3.842 3.545 67.68 53.193 188.59 0.725 Average 3.830 3.542 67.561 53.288 188.732 0.730 Std. Dev. (%) - repeatability 0.46 0.14 0.25 0.25 0.11 0.87 Sanyo HIP-190 BA3 Lab Difference (%) - reproducibility 2.7 1.5 0.4 -3.2 -1.8 -4.8 3/23/2006 5.198 4.749 45.09 35.493 168.567 0.719 . . .
. . .  largest difference being less than 1.5%. Unfortunately, it was discovered after all testing had been completed at ASU-PTL and Sandia that the Solarex module had an intermittent series resistance problem that resulted in a relatively large difference (5%) between labs in the V mp , P mp , and FF values. Being unaffected by the series resistance, the agreement in I sc and V oc values was still outstanding, agreeing within less than 1.5%. For the SunPower, Sanyo or Sharp modules, the maximum difference in P mp was less than 3.5%. CONCLUSIONS The effort to replicate outdoor test methods and data analysis procedures used at Sandia has been very successful, achieving high levels of both repeatability and agreement between both labs. Additional periodic module intercomparisons using the Sandia procedure are planned in order to maintain . . .
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