ASTM E1362-99
(Test Method)Standard Test Method for Calibration of Non-Concentrator Photovoltaic Secondary Reference Cells
Standard Test Method for Calibration of Non-Concentrator Photovoltaic Secondary Reference Cells
SCOPE
1.1 This test method covers calibration and characterization of secondary terrestrial photovoltaic reference cells to a desired reference spectral irradiance distribution. The recommended physical requirements for these reference cells are described in Specification E1040. Reference cells are principally used in the determination of the electrical performance of a photovoltaic device.
1.2 Secondary reference cells are calibrated indoors using simulated sunlight or outdoors in natural sunlight by reference to a primary reference cell previously calibrated to the same desired reference spectral irradiance distribution.
1.3 This test method applies only to the calibration of a photovoltaic cell that demonstrates a linear short-circuit current versus irradiance characteristic over its intended range of use, as defined in Test Method E1143.
1.4 This test method applies only to the calibration of a photovoltaic cell that has been fabricated using a single photovoltaic junction.
1.5 There is no similar or equivalent ISO standard.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:E1362–99
Standard Test Method for
Calibration of Non-Concentrator Photovoltaic Secondary
Reference Cells
This standard is issued under the fixed designation E1362; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope E490 Solar Constant and Air Mass Zero Solar Spectral
Irradiance Tables
1.1 This test method covers calibration and characterization
E691 Practice for Conducting an Interlaboratory Study to
ofsecondaryterrestrialphotovoltaicreferencecellstoadesired
Determine the Precision of a Test Method
reference spectral irradiance distribution. The recommended
E772 Terminology Relating to Solar Energy Conversion
physicalrequirementsforthesereferencecellsaredescribedin
E816 Specification for Calibration of Pyrheliometers by
Specification E1040. Reference cells are principally used in
Comparison to Reference Pyrheliometers
the determination of the electrical performance of a photovol-
E891 Tables for Terrestrial Direct Normal Solar Spectral
taic device.
Irradiance for Air Mass 1.5
1.2 Secondary reference cells are calibrated indoors using
E892 Tables for Terrestrial Solar Spectral Irradiance atAir
simulated sunlight or outdoors in natural sunlight by reference
Mass 1.5 for a 37° Tilted Surface
to a primary reference cell previously calibrated to the same
E927 Specification for Solar Simulation for Terrestrial
desired reference spectral irradiance distribution.
Photovoltaic Testing
1.3 Secondary reference cells calibrated according to this
E948 Test Method for Electrical Performance of Photovol-
test method will have the same radiometric traceability as the
taic Cells Using Reference Cells Under Simulated Sun-
of the primary reference cell used for the calibration. There-
light
fore, if the primary reference cell is traceable to the World
E973 Test Method for Determination of the Spectral Mis-
Radiometric Reference (WRR, see Test Method E 816), the
match Parameter Between a Photovoltaic Device and a
resulting secondary reference cell will also be traceable to the
Photovoltaic Reference Cell
WRR.
E1021 Test Methods for Measuring Spectral Response of
1.4 This test method applies only to the calibration of a
Photovoltaic Cells
photovoltaiccellthatdemonstratesalinearshort-circuitcurrent
E1039 TestMethodforCalibrationandCharacterizationof
versus irradiance characteristic over its intended range of use,
Non-ConcentratorTerrestrial Photovoltaic Reference Cells
as defined in Test Method E1143.
Under Global Irradiation
1.5 This test method applies only to the calibration of a
E1040 Specification for Physical Characteristics of Non-
photovoltaic cell that has been fabricated using a single
Concentrator Terrestrial Photovoltaic Reference Cells
photovoltaic junction.
E 1125 Test Method for Calibration of Primary Non-
1.6 There is no similar or equivalent ISO standard.
Concentrator Terrestrial Photovoltaic Reference Cells Us-
1.7 This standard does not purport to address all of the
ing a Tabular Spectrum
safety concerns, if any, associated with its use. It is the
E1143 Test Method for Determining the Linearity of a
responsibility of the user of this standard to establish appro-
Photovoltaic Device Parameter With Respect to a Test
priate safety and health practices and determine the applica-
Parameter
bility of regulatory limitations prior to use.
E1328 Terminology Relating to Photovoltaic Solar Energy
2. Referenced Documents
Conversion
2.1 ASTM Standards:
This test method is under the jurisdiction ofASTM Committee E-44 on Solar,
Geothermal,andOtherAlternativeEnergySourcesandisthedirectresponsibilityof Annual Book of ASTM Standards, Vol 15.03.
Subcommittee E44.09 on Photovoltaic Electric Power Conversion. Annual Book of ASTM Standards, Vol 14.02.
Current edition approved Oct. 10, 1999. Published November 1999. Originally Annual Book of ASTM Standards, Vol 12.02.
published as E1362-95. Last previous edition E1362-95. Annual Book of ASTM Standards, Vol 14.04.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
E1362
3. Terminology 4.1.3 Linearity of short-circuit current versus irradiance is
determined in accordance with Test Method E1143.
3.1 Definitions—Definitions of terms used in this test
4.1.4 The relative spectral distribution of the light source is
method may be found in Terminology E772 and in Terminol-
determinedusingaspectralirradiancemeasurementinstrument
ogy E1328.
as specified in Test Method E973.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 cell temperature, °C, n—the temperature of the semi-
5. Significance and Use
conductor junction of a photovoltaic cell.
5.1 The electrical output of photovoltaic devices is depen-
3.2.2 junction temperature, n—synonym for cell tempera-
dent on the spectral content of the source illumination and its
ture.
intensity. To make accurate measurements of the performance
3.2.3 test light source, n—a source of radiant energy used
of photovoltaic devices under a variety of light sources, it is
for the secondary reference cell calibration.
necessary to account for the error in the short-circuit current
3.3 Symbols:
that occurs if the relative spectral response of the primary
3.3.1 The following symbols and units are used in this test
referencecellisnotidenticaltothespectralresponseofthecell
method:
tobecalibrated.Asimilarerroroccursifthespectralirradiance
2 −1
C—calibration constant, Am W ,
distributionofthetestlightsourceisnotidenticaltothedesired
−2
E—irradiance, Wm ,
reference spectral irradiance distribution. These errors are
−2
E—total irradiance, Wm ,
t
accounted for by the spectral mismatch parameter M (Test
I—current, A,
Method E973), a quantitative measure of the error in the
I —primary reference cell short-circuit current, A,
p
short-circuit current measurement. It is the intent of this test
I —secondary reference cell short-circuit current, A,
s
method to provide a recognized procedure for calibrating,
I —short-circuit current, A,
sc
characterizing,andreportingthecalibrationdataforsecondary
L—collimator length, m,
photovoltaic reference cells.
M—spectral mismatch parameter,
5.2 A secondary reference cell is calibrated to the same
n—total number of data points,
reference spectral irradiance distribution as the primary refer-
r—collimator receiving aperture radius, m,
ence cell used during the calibration. Primary reference cells
R—collimator opening aperture radius, m,
canbecalibratedbyuseofTestMethodE1125orTestMethod
−1
R —absolute spectral response, AW , E1039.
a
R —relative spectral response,
r
NOTE 1—No standards for calibration of reference cells to the extra-
S—standard deviation,
terrestrial spectral irradiance distribution presently exist.
T—temperature, °C,
5.3 Asecondaryreferencecellshouldberecalibratedyearly,
−1
a—temperature coefficient of reference cell, °C ,
or every six months if the cell is in continuous use outdoors.
u —collimator opening angle, °, and
o
5.4 Recommended physical characteristics of reference
l—wavelength, nm or µm.
cells are provided in Specification E1040.
3.3.2 Symbolic quantities that are functions of wavelength
appear as X(l).
6. Apparatus
6.1 Normal Incidence Tracking Platform (for calibrations
4. Summary of Test Method
conducted in natural sunlight)—A tracking platform used to
4.1 The calibration of a secondary photovoltaic reference
follow the sun that holds both the primary reference cell and
cell consists of measuring the short-circuit current of the cell
the cell to be calibrated. The tracker shall be able to track the
under natural or simulated sunlight using a primary reference
sun to within 60.5° during the calibration procedure.
cell to measure the incident irradiance. In addition to the
6.1.1 When the calibration is performed in direct natural
short-circuitcurrent,therelativespectralresponseofthecellto
sunlight, each cell and the spectral irradiance measurement
be calibrated and the relative spectral irradiance of the light
(see 6.7) shall have collimators that meet the requirements of
source must be determined. Errors in the short-circuit current
Annex A1 of Test Method E1125.
due to the spectral irradiance of the light source and the
6.1.2 When the calibration is performed in global normal
spectral response of the primary reference cell are then
conditions, no significant energy reflected from surrounding
corrected by dividing the short-circuit current by the spectral
buildings or any other surfaces in the vicinity of the test stand
mismatch parameter.Also, if the temperature of the cell is not
shall be allowed onto the reference cells for the duration of the
25 6 1°C, the temperature coefficient for the short-circuit
calibration period. Care shall be taken to conduct the calibra-
current is needed. The list of necessary test methods is as
tion in a location or manner such that a condition of high
follows:
ground reflectance is avoided. If significant reflection can
4.1.1 The spectral response of the cell to be calibrated is
occur, provision shall be made on the tracker to shield the
determined in accordance with Test Methods E1021. reference cells by the use of a horizon shield. This horizon
4.1.2 The cell’s short-circuit current temperature coefficient shield shall consist of a black nonreflecting surface, and shall,
is determined experimentally by measuring short-circuit cur- as viewed by each reference cell, block the view downward
rent at various temperatures and computing the temperature from the local horizon to the lowest extremes of the field of
coefficient. view.
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