IEC/TS 63092-3:2026

• Abstract:

  This document 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: 31-Aug-2026
• ICS: 27.160 - Solar energy engineering
• Technical Committee: ISO/TC 160/SC 1 - Product considerations
• Drafting Committee: ISO/TC 160/SC 1 - Product considerations
• Current Stage: 6060 - International Standard published
• Start Date: 01-Sep-2026
• Due Date: 23-Dec-2024
• Completion Date: 31-Aug-2026

IEC/TS 63092-3:2026 is an IEC Technical Specification, published as a double logo document with ISO technical committee 160, Glass in building. It specifies a calorimetric method to determine the solar heat gain coefficient (SHGC or g value) of building-integrated photovoltaic (BIPV) modules, including the effect of electricity taken from the module at maximum power point (MPP). It is aimed at manufacturers, test laboratories, and others who need comparable g values for BIPV modules with different designs.

What does IEC/TS 63092-3:2026 specify?

IEC/TS 63092-3:2026 specifies how to measure and evaluate the g value of BIPV modules using either the hot box method or the cooled plate method from ISO 19467 and ISO 19467-2. It is built around calorimetric testing, so the result reflects the whole module under test rather than only optical component data.

The document applies to BIPV modules defined in IEC 63092-1, including modules with different effective cell area ratios but otherwise identical components such as cells, interconnects, encapsulation, and front/back sheets. It also covers all PV cell technologies and coloured BIPV modules.

The document is organized into these main clauses:

• Scope
• Normative references
• Terms and definitions
• Test samples and equipment
• Test procedures
• Evaluation of g value of subject modules with arbitrary cell area ratio
• Test report

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

Test samples and measurement equipment

IEC/TS 63092-3:2026 requires two kinds of samples: a standard test sample that contains all components of the actual module, and a transparent test sample with the same glazing configuration and materials but without PV cells or interconnects. In practice, this lets a lab separate the thermal effect of the glazing package from the extra effect of the active PV area.

The standard test sample shall match the subject module in glass type, glazing configuration, thickness, encapsulant type and thickness, PV cell type and thickness, and interconnect details. The effective cell area ratio shall be at least 0.55, and a 1 m sample is recommended, with a minimum size of 0.8 m × 0.8 m.

The required equipment includes a calorimetric metering box compliant with ISO 19467 or ISO 19467-2, a steady-state solar simulator of IEC 60904-9 class C or better, an electrical load or MPPT arrangement, and an I-V curve tracer. In practice, the measurement setup must support both thermal testing and electrical operating control.

Test procedure

IEC/TS 63092-3:2026 uses two successive measurements: first the transparent test sample, then the standard test sample in both open circuit (OC) and MPP states. The MPP state matters because the document explicitly includes the effect of extracting electrical power while the module is being thermally tested.

The electrical operating point shall be set and verified using IEC 60904-1 and IEC 60891 procedures. If the module is not held by an MPPT device, a resistive load shall be sized so that the sample operates near MPP, within ±5 % under the test conditions.

The document also gives practical limits for test conditions and checks. It recommends steady-state cell temperatures between 25 °C and 50 °C and irradiance between 500 W/m² and 700 W/m². It also requires the measured V_oc, I_sc, and P_mpp, after correction, to agree within 10 % with certified IEC testing at STC, which helps confirm that the sample and mounting remain electrically sound during the g-value test.

Evaluation and reporting

IEC/TS 63092-3:2026 evaluates the final g values by linear interpolation from the transparent test sample and the highest-area standard test sample, separately for OC and MPP operation. That makes the method useful for modules with different cell coverage but the same component set.

The document also allows linear extrapolation for modules with larger cell area ratios than the standard test module, although it recommends choosing the largest possible cell area ratio as the standard test sample. Test reports shall include the measurement method, environmental conditions, equipment, MPPT or load details, g values for the transparent and standard samples, calculated g values for the subject modules, uncertainties, surface temperatures, and a full description of the samples tested.

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

• Subject BIPV module - the actual BIPV module whose g value is being declared.
• Standard test sample - a sample of about 1 m × 1 m that includes all components of the actual module and uses the same key materials and subassemblies.
• Transparent test sample - a sample with the same glazing configuration and materials as the actual product, but without PV cells or interconnects.
• Effective cell area ratio - the ratio of PV cell area to total photovoltaic module area.
• Total photovoltaic module area - the area based on the module’s external dimensions H × W.
• Maximum power point (MPP) - the operating point at which the module delivers maximum power during testing.
• Open circuit (OC) - the condition where the module is not delivering external current.

Who uses IEC/TS 63092-3:2026?

IEC/TS 63092-3:2026 is used by BIPV module manufacturers, test laboratories, and certification bodies that need repeatable SHGC or g value results. It is also relevant to product developers, quality managers, and engineers comparing BIPV designs with different cell area ratios, glazing configurations, or coloured module constructions. In building practice, it supports product evaluation for energy calculations and product comparison.

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

• IEC 60891 - used for temperature and irradiance corrections to measured I-V characteristics.
• IEC 60904-1 - used for measuring photovoltaic I-V characteristics and determining MPP.
• IEC 60904-9 - used to classify solar simulator characteristics.
• IEC 61215-1 and IEC 61215-2 - provide PV module terminology and test background used in the definitions.
• IEC TS 61836 - provides solar photovoltaic energy system terms, definitions, and symbols.
• IEC 63092-1 - gives the basic requirements for BIPV modules.
• IEC 63092-2 - gives the basic requirements for BIPV systems.
• ISO 9050 - provides optical and solar glazing properties used for traceability checks and comparison.
• ISO 9845-1 - defines the reference solar spectral irradiance used for simulator spectral match.
• ISO 19467 and ISO 19467-2 - give the SHGC test methods that IEC/TS 63092-3 builds on.

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

IEC/TS 63092-3:2026 contains a test concept based on a transparent reference sample and a standard BIPV sample, then uses OC and MPP measurements to build g values for other cell-area ratios by interpolation. Figure 1 shows the standard and transparent test samples, and Figure 2 shows how g varies with cell area ratio in OC and MPP operation.

It also includes tables for symbols, units, and subscripts, plus procedural details on sample preparation, simulator quality, electrical loading, temperature measurement, and traceability to optical measurements. The final clause gives a reporting checklist that supports laboratory records, product comparison, and technical assessment.

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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IEC TS 63092-3:2026 © IEC 2026
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

IEC TS 63092-3:2026 © IEC 2026
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.
IEC TS 63092-3:2026 © IEC 2026
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.
IEC TS 63092-3:2026 © IEC 2026
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.
IEC TS 63092-3:2026 © IEC 2026
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
IEC TS 63092-3:2026 © IEC 2026
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
...