Programm Photovoltaik Ausgabe 2008 ... - Bundesamt für Energie BFE

1. Traceable performance measurement of PV devices (SP1)
1.2 ISAAC 2007 Activities (SP1)
1.2.1 Round Robin tests (WP1.1)
Two round robins are planned within the first two years of the project. The first of two c-Si module
measurement round robin has been successfully concluded in May 2007 and the results were published
at different conferences. The first thin film round robin is still under progress and the final results
will be available for the begin of 2008. Preliminary results have been already published at the German
PV Module Workshop organised by TÜV in Köln. Our laboratory terminated all measurements and the
data were delivered to the coordinator of the sub-project (TÜV).
Table 1 shows the 6 laboratories which participated at the c-Si measurement campaign with the respective
applied equipment and procedures. All main European PV module test laboratories are here
involved. The variety of test procedures and measuring equipments among the different test laboratories
was advantageous to the study and strengthen the results.
Test laboratory
Simulator type Procedure for STC performance measurement
Arsenal Berger, PSS8 Outdoor calibration of Isc and I-V measurement with pulsed solar
simulator
Ciemat Belval, Pasan IIIb I-V measurement with pulsed solar simulator, outdoor measurement
for verification of indoor results
ISE Belval, Pasan IIIb I-V measurement with pulsed solar simulator, multiflash measurement
if required (I-V segment), module SR measurement to
compensate for spectral mismatch
JRC Spectrolab, Indoor measurement of Isc and SR for all modules, outdoor I-V
LAPSS
measurement (Isc scaled to indoor measured and mismatch corrected
Isc), for comparison also indoor I-V measurement
SUPSI Belval, Pasan IIIa Single-flash I-V measurement with pulsed solar simulator for noncritical
technologies, multiflash method for modules with high efficiency
cells (1 data point per flash)
TÜV OSRAM HMI I-V measurement with steady-state solar simulator, use of spec-
4000W
trally matched reference devices (mini-modules)
Table 1: Description of test equipment and methods in the participating test laboratories.
Results of the c-Si Round Robin
Table 2 shows the crystalline silicon technologies investigated within the first RR. The first 3 are modules
with high cell efficiencies, the forth is made of EFG cells and the last contains 8-inch cells.
Manufacturer Technology
SunPower Corporation back contact cells
Sanyo Electric Co. Ltd. HIT
Microsol International LL Fze. Motech technology
SCHOTT Solar EFG
Qcells AG 8-inch cells
Table 2: Cell technologies circulated within the c-Si round-robin test
The measurements executed by ISAAC in 2006 have been already described in detail within the first
annual report. The final results of the intercomparison are: Figure 1 shows the comparison of the
maximum power measurements between the laboratories. The data are referred to the average of the
test samples. The spread for reported Pmax values lies all in the range ±2%. The ISAAC institute
confirmed so its comparability with the other laboratories. The absence of differences between
“standard” and high efficiency cell technologies, as visible by figure 2, proves that adequate measurement
methods for high-efficiency (high capacitive) modules exist in all laboratories. Especially in
our case this result is very important as we are the laboratory with the solar simulator with the shortest
light pulse (plateau of 1.2-2ms).
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