Abstract: . . .  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 . . .
. . .  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 . . .
. . .  comparable test results. ASU personnel conducted daylong performance measurements on the five PV modules in accordance with Sandia procedure and guidance. As shown in Fig. 1, the performance measurements included sequential current-voltage (I-V) scans using a DayStar DS-100 curve tracer with modules mounted on a solar tracker or fixed-rack, as well as simultaneous measurements of solar irradiance (using a silicon reference cell and an Eppley PSP pyranometer) and module temperature at two locations on the back surface. These daylong tests were performed on several different days for each module in order to demonstrate the repeatability . . .
. . .  53.898 189.18 0.752 Sanyo HIP-190 BA3 Lab Difference (%) - reproducibility 0.6 0.6 -0.3 -2.1 -1.6 -1.8 Sandia 6/13/2002 5.256 4.796 45.659 36.314 174.15 0.726 ASU 3/12/2006 5.203 4.712 45.182 35.527 167.39 0.712 Sharp NT-KR5EX Lab Difference (%) - reproducibility -1.0 -1.8 -1.0 -2.2 -3.9 -1.9 Page 4 Table 2. Performance at SRC using daylong I-V measurements at ASU-PTL and Sandia analysis method. Module Type Measurement Date Isc (A) Imp (A) Voc (V) Vmp (V) Pmp (W) FF 3/8/2005 3.536 3.239 21.29 16.71 54.13 0.719 4/22/2005 3.544 3.236 21.32 16.75 54.22 0.718 9/1/2005 3.479 3.207 21.34 16.82 53.95 0.727 Average 3.520 3.228 . . .
--2503,4,313,2829,12513