IEC TS 63092-3:2026

• Abstract:

  IEC TS 63092-3:2026 is intended to provide a versatile method to determine the solar heat gain coefficient (SHGC or g value) of BIPV modules with a variety of designs.; It addresses the calorimetric determination of the g value for BIPV modules by using the hot box method or the cooled plate method in accordance with ISO 19467 and ISO 19467‑2. The method takes into account the effect on the g value of extracting photovoltaically generated electricity from the BIPV module in the maximum power point state.; This document applies to BIPV modules as defined in IEC 63092‑1 and specifically to BIPV modules with different effective cell area ratios but consisting of identical components such as cells, interconnects, encapsulation and front/back sheets. This evaluation method is applicable to all PV cell technologies and includes coloured BIPV modules.; It is published as a double logo Technical Specification with ISO technical committee 160: Glass in building.

• Status: Published
• Publication Date: 24-Aug-2026
• ICS: 27.160 - Solar energy engineering
• Technical Committee: TC 82 - Solar photovoltaic energy systems
• Drafting Committee: JWG 11 - TC 82/JWG 11
• Current Stage: PPUB - Publication issued
• Start Date: 25-Aug-2026
• Completion Date: 04-Sep-2026

IEC TS 63092-3:2026 is an IEC Technical Specification, prepared in collaboration with ISO technical committee 160, that describes a calorimetric method for determining the solar heat gain coefficient, also called the g value, of building-integrated photovoltaic (BIPV) modules. It is written for manufacturers, test laboratories, and others who need comparable g values for BIPV modules with different cell area ratios, including coloured modules and modules using different PV cell technologies.

What does IEC TS 63092-3:2026 specify?

IEC TS 63092-3:2026 specifies a method for determining the g value of BIPV modules by calorimetric testing with either the hot box method or the cooled plate method in accordance with ISO 19467 and ISO 19467-2. The method is organized to support modules with varying designs but common component sets.

The document applies to BIPV modules as defined in IEC 63092-1, especially modules with different effective cell area ratios but identical cells, interconnects, encapsulation, and front/back sheets. It is described in seven clauses covering scope, normative references, terms, test samples and equipment, test procedures, evaluation of g value for arbitrary cell area ratio, and test report.

What are the key requirements of IEC TS 63092-3:2026?

IEC TS 63092-3:2026 requires a two-step evaluation: first test a transparent sample with no PV cells, then test a standard sample with cells in both open circuit and maximum power point states. The result is used to derive g values for other module layouts by interpolation.

Test samples must represent the actual product

Clause 4 requires the standard test sample to include the same glazing, encapsulant, PV cell type, interconnects, and related materials as the subject module. The transparent test sample uses the same glazing configuration and materials but omits PV cells and interconnects. This matters because the method depends on comparing like with like, not on reconstructing the whole module from separate optical parts.

The standard test sample should be about 1 m x 1 m, and its area should be at least 0.8 m x 0.8 m. The effective cell area ratio shall be at least 0.55. This sets a practical lower bound for the interpolation anchor point.

Measurement equipment has defined performance

Clause 4.2 requires a calorimetric metering box that complies with ISO 19467 or ISO 19467-2. The solar simulator shall be steady-state and meet IEC 60904-9 class C or better for temporal stability and spatial uniformity, with spectral match defined against ISO 9845-1.

Clause 4.2.3 and 4.2.4 require electrical load control with an MPPT or a resistive load near the maximum power point, plus an I-V curve tracer. In practice, the laboratory must measure the module’s electrical behaviour under the same irradiance used for the g-value test.

The test is run in open circuit and MPP states

Clause 5 states that the g value of the transparent sample is measured first, then the standard sample is measured in open circuit and MPP states. The MPP shall be determined from I-V measurements, and measurements taken outside STC shall be corrected with IEC 60891. This is what allows the method to capture the effect of extracting electricity from the module.

Conditions and sample integrity are controlled

Clause 5 also specifies environmental and temperature reporting. The document recommends summer conditions when the result will be used for comfort or cooling load calculations, and ISO 9050 reference boundary conditions when the result is mainly for product comparison. The report shall always state the test conditions used.

The standard sample’s electrical integrity is checked by comparing corrected Voc, Isc, and Pmpp against certified IEC testing at STC within 10 %. This helps confirm that the sample used for thermal testing is electrically sound.

Results are interpolated for other module layouts

Clause 6 uses the measured values from the transparent sample and the highest-cell-area-ratio standard sample to determine g values for subject modules with the same component set but arbitrary size and cell arrangement. Linear interpolation is used, and extrapolation beyond the highest tested cell area ratio is allowed.

The report must document the test clearly

Clause 7 requires the report to identify the method, equipment, environmental conditions, MPP control, measured g values, uncertainty, and detailed sample descriptions. That makes the result usable for product data, comparisons, and building energy calculations.

What terms does IEC TS 63092-3:2026 define?

• Subject BIPV module - the actual BIPV product for which the g value is being determined.
• Standard test sample - an approximately 1 m x 1 m sample that includes all components of the actual module product.
• Transparent test sample - a sample with the same glazing configuration as the actual product but without PV cells or interconnects.
• Effective cell area ratio - the ratio of PV cell area to the total photovoltaic module area.
• Total photovoltaic module area - the area of the module based on its external dimensions.
• Solar heat gain coefficient (SHGC) or g value - the quantity used here for total solar energy transmittance of the BIPV module.
• Maximum power point tracker (MPPT) - the device used to hold the module near its maximum power point during the test.
• Open circuit (OC) state - the condition in which the module is not delivering current during g-value measurement.

Who uses IEC TS 63092-3:2026?

IEC TS 63092-3:2026 is used by BIPV manufacturers, test laboratories, certification and assessment bodies, and technical teams working on building energy performance. It is also useful for quality managers and buyers who need comparable g values for products with different cell coverage, different dimensions, or coloured BIPV designs.

Which standards are used with IEC TS 63092-3:2026?

• IEC 60891 - provides temperature and irradiance correction procedures for measured I-V characteristics.
• IEC 60904-1 - gives the method for measuring photovoltaic I-V characteristics and determining the MPP.
• IEC 60904-9 - classifies solar simulator characteristics.
• IEC 61215-1 and IEC 61215-2 - provide PV module test requirements and procedures used for terminology and sample soundness context.
• IEC TS 61836 - supplies terms, definitions, and symbols for solar photovoltaic energy systems.
• IEC 63092-1 - defines BIPV modules and provides the general requirements referenced by this part.
• IEC 63092-2 - provides the related requirements for BIPV systems.
• ISO 9050 - supports optical and solar transmittance checks and traceability.
• ISO 9845-1 - defines the reference solar spectral irradiance used for simulator spectral match.
• ISO 19467 and ISO 19467-2 - provide the calorimetric SHGC methods that this document builds on.
• ISO 52022-3 - is referenced for summer conditions when the g value is used for comfort and cooling calculations.

What does the IEC TS 63092-3:2026 document contain?

IEC TS 63092-3:2026 contains the sample definitions, equipment requirements, measurement conditions, step-by-step test procedure, interpolation method, and reporting items needed to determine g values for BIPV modules. It also includes Table 1 and Table 2 for symbols and subscripts, Figure 1 showing the standard and transparent samples, and Figure 2 showing how g value varies with cell area ratio under OC and MPP conditions.

The document is written so the test can be repeated with a small number of specimens while still supporting different module widths, heights, and cell layouts. It provides the structure needed for laboratory testing, product comparison, and documentation of BIPV thermal performance.

IEC TS 63092-3
Edition 1.0 2026-08
TECHNICAL
SPECIFICATION
Photovoltaics in buildings -
Part 3: Determination methodology for the solar heat gain coefficient of building-
integrated photovoltaic modules
ICS 27.160  ISBN 978-2-8327-1447-8

IEC TS 63092-3: 2026-08(en)
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CONTENTS
FOREWORD . 2
INTRODUCTION . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
3.1 Terms . 6
3.2 Symbols and subscripts . 7
4 Test samples and equipment . 7
4.1 Test samples . 7
4.2 Measurement equipment . 8
4.2.1 Calorimetric metering box . 8
4.2.2 Solar simulator . 8
4.2.3 Electrical load (MPPT, electronic or resistive) . 9
4.2.4 I-V curve tracer . 9
5 Test procedures . 9
5.1 General principle . 9
5.2 Further specifications . 9
5.2.1 Environmental conditions . 9
5.2.2 Surface temperature . 10
5.2.3 Ambient temperature . 10
5.2.4 Integrity of test sample . 10
5.3 Procedure for the g-value evaluation of the test samples . 10
5.4 Test sample traceability . 11
6 Evaluation of g value of subject modules with arbitrary cell area ratio . 11
7 Test report . 12
Bibliography . 14

Figure 1 – Standard test sample and transparent test sample . 8
Figure 2 – Cell area ratio dependence of g values under open circuit and maximum
power point conditions (g and g , respectively) . 12
m,oc m,mpp
Table 1 – Symbols and units . 7
Table 2 – Subscripts . 7

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Photovoltaics in buildings -
Part 3: Determination methodology for the solar heat gain
coefficient of building-integrated photovoltaic modules

FOREWORD
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IEC 63092-3 has been prepared by subcommittee IEC technical committee 82: Solar
photovoltaic energy systems, in collaboration with ISO technical committee 160: Glass in
building. It is a Technical Specification.
It is published as a double logo Technical Specification.
The text of this Technical Specification is based on the following documents:
Draft Report on voting
82/2564/DTS 82/2672/RVDTS
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Technical Specification is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 63092 series, published under the general title Photovoltaics in
buildings, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
INTRODUCTION
IEC 63092-1 and IEC 63092-2 describe general requirements for building-integrated
photovoltaic (BIPV) modules and systems, respectively. This part of IEC 63092 describes
specific requirements for the calorimetric determination of the solar heat gain coefficient (SHGC
or g value) for various designs of BIPV modules and provides complementary information to
IEC 63092-1.
BIPV modules are often custom made and the design qualification is complicated. In particular,
g-value measurements for construction components are made on test samples with dimensions
which are different to those specified for PV modules in IEC test standards. It is important for
manufacturers and users to use a simplified test method requiring a small number of test
specimens that provides applicable results to a variety of BIPV modules consisting of identical
components but varying in the effective cell area ratio.
The test method consists of two successive steps: g-value evaluation for transparent test
samples with the same glazing and encapsulant components as the BIPV modules, but without
solar cells or interconnects, and g-value evaluation for BIPV modules with a standard size in
the open circuit and maximum power point states. By using data for these samples, the g values
for any effective PV cell area ratio can be obtained by interpolation, corresponding to the g
values for BIPV modules with the same cell type and glazing configuration, but with different
heights, widths and cell configurations.
In the same way as the ISO 19467 series and ISO 9050 exist in parallel for determining the g
value of architectural glazing and serve different purposes, there is value in having both
approaches standardized for BIPV glazing. The component-based ISO 9050 (and its proposed
future BIPV annex) is useful if the solar heat gain coefficient (SHGC or g value) is used for
multi-pane glazing units which can be well characterized by optical measurements at normal
incidence. It is not applicable if the components are strongly light-scattering or if the g value is
used for other angles of incidence or if any components have a non-planar, non-parallel
geometry. These are cases where a calorimetric method of the whole unit is valuable,
particularly for building energy calculations. The same consideration applies to standards
addressing the g value of BIPV modules.
NOTE A component-based method to determine the g value of BIPV modules is already documented in EN 410-1 .
It is based on spectral measurements of the optically different components of a BIPV module and the photovoltaic
conversion efficiency of the BIPV module. It is anticipated that this method will also be included in the future edition
of ISO 9050.This method can be applied if it is feasible to carry out separate spectral measurements of the optically
different areas of a BIPV module, e.g. the area covered by PV cells and the transparent areas between the PV cells.
According to the papers by [1] and [2] , results obtained by applying both methods agree within experimental error.

___________
Under preparation. Stage at the time of publication: FprEN 410-1:2026.
Numbers in square brackets refer to the Bibliography.
1 Scope
This part of IEC 63092 is intended to provide a versatile method to determine the solar heat
gain coefficient (SHGC or g value) of BIPV modules with a variety of designs.
It addresses the calorimetric determination of the g value for BIPV modules by using the hot
box method or the cooled plate method in accordance with ISO 19467 and ISO 19467-2. The
method takes into account the effect on the g value of extracting photovoltaically generated
electricity from the BIPV module in the maximum power point state.
This document applies to BIPV modules as defined in IEC 63092-1 and specifically to BIPV
modules with different effective cell area ratios but consisting of identical components such as
cells, interconnects, encapsulation and front/back sheets. This evaluation method is applicable
to all PV cell technologies and includes coloured BIPV modules.
NOTE The solar heat gain coefficient is known by various names (SHGC, g value, solar factor, total solar energy
transmittance, etc.) depending on the country and region. These terms are all used to describe the same property;
small differences can be caused by different reference conditions (e.g. differences in the reference solar spectrum).
In this document, the quantity is referred to as the g value.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60891, Photovoltaic devices - Procedures for temperature and irradiance corrections to
measured I-V characteristics
IEC 60904-1, Photovoltaic devices - Part 1: Measurement of photovoltaic current-voltage
characteristics
IEC 60904-9, Photovoltaic devices - Part 9: Classification of solar simulator characteristics
IEC 61215-1, Terrestrial photovoltaic (PV) modules - Design qualification and type approval -
Part 1: Test requirements
IEC 61215-2, Terrestrial photovoltaic (PV) modules - Design qualification and type approval -
Part 2: Test procedures
IEC TS 61836, Solar photovoltaic energy systems - Terms, definitions and symbols
IEC 63092-1, Photovoltaics in buildings - Part 1: Requirements for building-integrated
photovoltaic modules
IEC 63092-2, Photovoltaics in buildings - Part 2: Requirements for building-integrated
photovoltaic systems
ISO 9050, Glass in building - Determination of light transmittance, solar direct transmittance,
total solar energy transmittance, ultraviolet transmittance and related glazing factors
ISO 9845-1, Solar energy - Reference solar spectral irradiance at the ground at different
receiving conditions - Part 1: Direct normal and hemispherical solar irradiance for air mass 1,5
ISO 19467:2017, Thermal performance of windows and doors - Determination of solar heat gain
coefficient using solar simulator
ISO 19467-2:2021, Thermal performance of windows and doors - Determination of solar heat
gain coefficient using solar simulator - Part 2: Centre of glazing
3 Terms and definitions
3.1 Terms
For the purposes of this document, the terms and definitions given in IEC 61215-1, IEC 61215-2,
IEC 63092-1, IEC 63092-2, IEC TS 61836, ISO 19467, ISO 19467-2 and ISO 9050 and the
following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
3.1.1
...