REPORT FUE14263 Salt Mist Corrosion Test Daniel Philipp Fraunhofer-Institute for Solar Energy Systems, ISE in Freiburg. FUE14263 Gazioğlu Solar Enerji San. Ve Tic. A.Ş. Mr. Kerim Gazioglu Gazi Osman Paşa mh. 7. cd. No:124 59500 Çerkezköy/Tekirdağ Türkei This report contains 9 pages. It should not be published in an incomplete or distorting context. The disclosure to a third party needs the approval of Fraunhofer ISE. Fraunhofer-Institute for Solar Energy Systems ISE Division Photovoltaic Modules, Systems and Reliability (PMZ) Department Weathering and Reliability (GAUS) Freiburg, October 1, 2014 Digitally signed by Georg Muelhoefer Georg Mülhöfer, Dipl.-Ing. (FH) Testing Engineer Fraunhofer ISE Report FUE14263 Salt mist corrosion test Digitally signed by Daniel Philipp Date: 2014.10.01 18:21:55 +02'00' Daniel Philipp, Dipl.-Ing. (FH) Head of TestLab PV Modules Gazioğlu 2|9 Content Preliminary Remarks 1 1.1 1.2 1.3 Preliminary Remarks ......................................................................................... 4 Project Description ............................................................................................... 4 Sample Description .............................................................................................. 4 Summary ............................................................................................................. 4 2 3 3.1 3.2 3.3 3.4 3.5 3.6 Testing Procedure ............................................................................................. 5 Results ................................................................................................................ 6 Visual Inspection .................................................................................................. 6 Electrical Insulation............................................................................................... 6 Performance Measurement .................................................................................. 7 Ground Continuity Test ........................................................................................ 7 Bypass Diode Functionality Test ............................................................................ 8 Electroluminescence Imaging ............................................................................... 8 Fraunhofer ISE Report FUE14263 Salt mist corrosion test Gazioğlu 3|9 1 Preliminary Remarks Preliminary Remarks 1.1 Project Description Two modules of type GSE Mono Power 250 produced by Gazioğlu Solar Enerji San. Ve Tic. A.Ş have been tested in the salt mist corrosion test according to IEC 61701, severity level 5. The following table lists the modules with TLPV-ID, serial number and type. Table 1: Naming of the samples TLPV-ID Serial number Type Stress test M09 20140114029SAR GSE Mono Power 250 Salt mist corrosion test M10 20140114028SAR GSE Mono Power 250 Salt mist corrosion test The samples were characterized according to the requirements given in IEC 61701. Additionally, electroluminescence measurements were conducted before and after the stress test. The modules used for the salt mist test are the same modules which had already been tested in other stress tests before (PID and LID). Therefore, in the measurement results in chapter 3, initial measurements deviate slightly from nominal values. For the evaluation of the stability against salt mist, this circumstance is not relevant. 1.2 Sample Description The following table gives more information about the tested module type. Table 2: Sample description Manufacturer Type Technology nominal Pmpp [W] TLPV-ID Condition Gazioglu GSE Mono Power 250 60 mono-Si 251 M09, M10 After LID, PID 1.3 Summary Both modules passed the salt mist test, severity level 5, according to IEC 61701. All characterization tests were passed. The electroluminescence images show no abnormalities caused by salt mist testing. Fraunhofer ISE Report FUE14263 Salt mist corrosion test Gazioğlu 4|9 2 Testing Procedure Testing Procedure The modules are tested in the salt mist corrosion test, severity level 5, as defined in IEC 61701. The test contains spray phases, storage at humid climate and at standard conditions. The severity level defines the number of test cycles. The test duration of severity level 5 is 28 days. Detailed specifications for the general conditions, apparatus, characteristics of the salt solution etc. are defined in IEC 60068-2-52. After the stress test, the modules were cleaned as defined in the standard before the final characterization. The following test sequence has been conducted: Performance at STC according to IEC 61215, 10.2 Wet leakage current test according to IEC 61215, 10.15 Visual inspection according to IEC 61730-2, MST 01 Ground continuity test according to IEC 61730-2, MST13 Dielectric withstand test according to IEC 61730-2, MST 16 Electroluminescence measurement* Salt mist corrosion test, level 5 Performance at STC according to IEC 61215, 10.2 Wet leakage current test according to IEC 61215, 10.15 Visual inspection according to IEC 61730-2, MST 01 Ground continuity test according to IEC 61730-2, MST13 Dielectric withstand test according to IEC 61730-2, MST 16 Functional testing of bypass diode acc. to IEC 61701 Electroluminescence measurement* *additional characterization measurement, not required according to IEC 61701 Fraunhofer ISE Report FUE14263 Salt mist corrosion test Gazioğlu 5|9 3 Results Results 3.1 Visual Inspection Before and after the salt mist test, a visual inspection was performed. Each inspection is documented with a picture of the front and the rear side of the sample. In the following, the results of the inspections are given. All taken pictures can be handed over separately on request. Table 3: Results of visual inspection Module M09 M10 Run initial final initial final Pass/fail IEC61730 pass pass pass pass Remarks no no no no Concerning their visible appearance, both modules passed the salt mist test well. 3.2 Electrical Insulation The electrical insulation at dry and wet conditions has been determined before and after the salt mist test. The following two tables show the measured resistances for each module: Table 4: Results – Dielectric withstand test Pass/fail Insulation Run IEC61730 resistance [MΩ] initial pass 5000 final pass 5000 M10 initial pass 5000 final pass 5000 The value 5000 indicates a resistance above the upper limit of the measurement device. Module M09 Table 5: Results Wet leakage current test Pass/fail Insulation Run IEC61215 resistance [MΩ] initial pass 5000 final pass 5000 M10 initial pass 4690 final pass 5000 The value 5000 indicates a resistance above the upper limit of the measurement device. Module M09 Both modules passed the electrical safety tests well. No indication for a critical ingress of humidity could be detected. Fraunhofer ISE Report FUE14263 Salt mist corrosion test Gazioğlu 6|9 3.3 Performance Measurement Results In this section, the results of the performance measurements at STC are given. Table 6 lists the results of the initial and final measurement. The deviation of the initial measurement as well as of the final measurement is given. Table 6: Performance measurement at STC M09 - Type: GSE Mono Power 250 - Test: Salt mist Uoc Isc 20140114029SAR [V] [A] Nominal 37,20 9,15 Before salt mist corrosion test 37,39 8,76 Deviation to nominal value [%] 0,5 -4,2 Salt mist corrosion test After salt mist corrosion test 37,34 8,82 Deviation to initial measurement [%] -0,1 0,6 M10 - Type: GSE Mono Power 250 - Test: Salt mist Uoc Isc 20140114028SAR [V] [A] Nominal 37,20 9,13 Before salt mist corrosion test 37,37 8,73 Deviation to nominal value [%] 0,5 -4,3 Salt mist corrosion test After salt mist corrosion test 37,34 8,81 Deviation to initial measurement [%] -0,1 0,9 Umpp [V] 29,24 29,87 2,2 Impp [A] 8,60 8,20 -4,7 Pmax [W] 251,46 244,80 -2,7 eff [%] 15,39 14,99 -2,7 FF [%] 73,88 74,72 1,1 29,80 -0,3 8,24 0,6 245,61 0,3 15,04 0,3 74,60 -0,2 Umpp [V] 29,22 29,85 2,1 Impp [A] 8,57 8,18 -4,5 Pmax [W] 250,42 244,25 -2,5 eff [%] 15,33 14,95 -2,5 FF [%] 73,73 74,83 1,5 29,79 -0,2 8,27 1,0 246,32 0,8 15,08 0,8 74,84 0,0 3.4 Ground Continuity Test The resistance between exposed conductive components has been determined before and after the salt mist test. The following table shows the measured resistances for each module: Table 7: Results – Ground continuity test Module M09 M10 Fraunhofer ISE Run initial final initial final Pass/fail IEC61730 pass pass pass pass Resistance [Ω] <0,1 <0,1 <0,1 <0,1 Report FUE14263 Salt mist corrosion test Gazioğlu 7|9 3.5 Bypass Diode Functionality Test Results After the salt mist test, the functionality of the bypass diodes has been tested. The diodes in both modules are still operational. 3.6 Electroluminescence Imaging Tables 8 and 9 show the electroluminescence images of the tested modules before and after the salt mist test while applying ISC. Table 8: Electroluminescence images of module M09 at Isc M09 Before salt mist test Fraunhofer ISE After salt mist test Report FUE14263 Salt mist corrosion test Gazioğlu 8|9 Table 9: Electroluminescence images of module M10 at Isc Results M10 Before salt mist test Fraunhofer ISE After salt mist test Report FUE14263 Salt mist corrosion test Gazioğlu 9|9
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