Programm Photovoltaik Ausgabe 2009 ... - Bundesamt für Energie BFE

formed with two standard halogen lamps of 1500 Watts each. The irradiance on the module of the two
spotlights was 20 W/m 2 . For the new procedure two new spotlights with metal halide bulbs were installed.
The bulbs are of OSRAM, model HQI/D (daylight), with a high intensity in the blue spectrum
and a power of 400 W each. The blue spectrum should accelerate the stabilisation time of the module
[REF3]. The irradiance on the module during the measurements was still 20 W/m 2 in order to enable a
comparison between the old and new results. The bias light intensity of the irradiance in the PV module
plane is measured with the voltage of the reference cell. The scope of the study is to understand
the different behaviour in maximum power measurements and stabilisation time with bias light at STC
between a to sun light exposed module (outdoor module) and a at ambient temperature and dark
stored module (indoor module). The details of the measurement procedure are shown in Figure 2. The
measurements are repeated in an interval of one week and the repeatability of the measurements is
compared to the one of stable crystalline silicon modules. The cycles started end of November and the
first results are expected in February 2009.
out�door laboratory
Test�procedure�for�the�'outdoor'�module
Test�procedure�for�the�'indoor'�module
Operation Data Operation
1. positioning�on�outdoor�stand date��time
2. module�in�open�circuit
preparation�of�sun�simulator
meteo�data,�modul�temperature
dark�storage�at�25°C 1.
3.
prepartion�and�checking�of�BIAS�light
preparation�of�sun�simulator preparation�of�sun�simulator
4. disassembling�module date���time preparation�and�checking�of�BIAS�light
2.
5. cleaning�and�transfer�in�laboratory preparation�of�sun�simulator
6. mounting�on�sun�simulator mounting�on�sun�simulator 3.
7. �I�V�measurement�at�STC Time���Temp.���I�V�measurement I�V�measurement�at�STC 4.
9. switch�on�BIAS switch�on�BIAS 6.
10. I�V�measurements�with�BIAS�light Time���Temp.���I�V�measurement I�V�measurements�with�BIAS�light 7.
11. measurement:�every�minute measurement:�every�minute 8.
12. time�in�dependence�of�results time�in�dependence�of�results 9.
13. repeat�measurement�until�stabilization�of�Wp repeat�measurement�until�stabilization�of�Wp 10.
RETURN�TO�POINT�1. RETURN�TO�POINT�1.
Figure 2: Weekly repeated test procedure for the investigation of CIGS modules.
1.2.5 Industry guidelines on PV module measurements (WP1.4)
One of the additional outcomes of the above described measurement round robins of SP1 is the publication
of some guidelines about how to measure PV modules in industry. The aim is to reduce variation
between measurement results from different sources and raise confidence. In order to be close to
practical applications a questionnaire has been developed to first assess the current status of measurements
in PV industry. Interviews were carried out by all SP1 partners to get accurate information
about industry needs and state of the art equipment and procedures. ISAAC contacted therefore four
of their main industry partners, including c-Si as well as a-Si PV module manufacturers. The guideline
will be available for the second half of 2009.
2. Energy Delivery of Photovoltaic Devices (SP2)
2.1 ISAAC SP2 ACTIVITIES (2008)
2.2.1 Quality measures within ISAAC outdoor energy rating stand (WP2.1)
In the process of the outdoor testing of PV modules, a large amount of data is collected. The reliability
of the later performed data analyses depends on the quality of the measured values. Data validation
procedures, that also take into account the local conditions, are required in order to be able to compare
the results of different measurement sites. Different quality control measures and data handling
procedures are currently discussed within the PERFORMANCE consortium. ISAAC started to implement
these into their energy rating outdoor stand. The reliability and utility of the single measures will
be tested starting from January 2009. Following quality markers will be tested: irradiance stability,
completeness of data, eventual detachment of temperature sensors, data acquisition errors, MPPT
tracking errors, identification of out of range values, day type codes, cross check of sensors of the
same type and different types of errors in irradiance measurements.
PERFORMANCE, G. Friesen, SUPSI, ISAAC-TISO
212/290
dark�storage laboratory
4/8