IEC 62093:2022

IEC 62093 ®
Edition 2.0 2022-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Photovoltaic system power conversion equipment – Design qualification and
type approval
Matériel de conversion de puissance des systèmes photovoltaïques –
Qualification de la conception et approbation de type

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IEC 62093 ®
Edition 2.0 2022-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Photovoltaic system power conversion equipment – Design qualification and

type approval
Matériel de conversion de puissance des systèmes photovoltaïques –

Qualification de la conception et approbation de type

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.160 ISBN 978-2-8322-1064-7

– 2 – IEC 62093:2022 © IEC 2022
CONTENTS
FOREWORD . 6
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 10
4 Sampling . 13
5 Testing requirements . 14
5.1 General . 14
5.2 Environmental service conditions . 14
5.2.1 General . 14
5.2.2 Outdoor . 14
5.2.3 Indoor, unconditioned . 15
5.2.4 Indoor, conditioned . 15
5.3 Test sequences . 15
5.3.1 General . 15
5.3.2 Test conditions for Category 1 PCE (Module level power electronics) . 15
5.3.3 Test conditions for Category 3 PCE–large scale and Category 4 PCE–
central large scale power conversion equipment . 16
5.3.4 Test conditions for Category 4 PCE (large central power conversion
equipment) . 16
5.4 General testing requirements . 21
5.4.1 Installation of testing sample . 21
5.4.2 Peripherals . 21
5.4.3 Connectors and wiring . 21
5.4.4 Measuring instruments and monitoring equipment . 21
5.4.5 Electrical power sources . 21
5.4.6 Electrical loads . 22
5.4.7 Earthing terminals . 22
5.4.8 Controls . 22
5.5 Pass criteria . 23
6 Test procedures . 23
6.1 Visual inspection . 23
6.1.1 Purpose . 23
6.1.2 Apparatus . 23
6.1.3 Procedure . 23
6.1.4 Requirements . 23
6.2 Characterization of operating performance . 24
6.2.1 Purpose . 24
6.2.2 Apparatus . 24
6.2.3 Procedure . 24
6.2.4 Restrictions and exceptions . 24
6.2.5 Requirements . 24
6.3 Functionality test . 24
6.3.1 Purpose . 24
6.3.2 Apparatus . 25
6.3.3 Procedure . 25
6.3.4 Restrictions and exceptions . 26
6.3.5 Requirements . 26

6.4 Voltage (dielectric strength) test . 26
6.4.1 Purpose . 26
6.4.2 Apparatus . 26
6.4.3 Procedure . 27
6.5 Bus link capacitor thermal test . 27
6.5.1 Purpose . 27
6.5.2 Apparatus . 27
6.5.3 Procedure . 27
6.5.4 Restrictions and exceptions . 29
6.5.5 Requirements . 29
6.6 Power transistor module thermal test . 30
6.6.1 Purpose . 30
6.6.2 Apparatus . 30
6.6.3 Procedure . 30
6.6.4 Restrictions and exceptions . 30
6.6.5 Requirements . 31
6.7 Humidity freeze test . 31
6.7.1 Purpose . 31
6.7.2 Apparatus . 31
6.7.3 Procedure . 32
6.7.4 Restrictions and exceptions . 33
6.7.5 Final measurements . 33
6.7.6 Requirements . 33
6.8 Thermal cycling test . 34
6.8.1 Purpose . 34
6.8.2 Apparatus . 34
6.8.3 Procedure . 35
6.8.4 Restrictions and exceptions . 37
6.8.5 Final measurements . 37
6.8.6 Requirements . 37
6.9 Damp heat test . 37
6.9.1 Purpose . 37
6.9.2 Apparatus . 38
6.9.3 Procedure . 38
6.9.4 Restrictions and exceptions . 40
6.9.5 Final measurements . 40
6.9.6 Requirements . 40
6.10 Dry heat test . 40
6.10.1 Purpose . 40
6.10.2 Apparatus . 40
6.10.3 Procedure . 41
6.10.4 Restrictions and exceptions . 42
6.10.5 Final measurements . 42
6.10.6 Requirements . 42
6.11 UV weathering test. 43
6.11.1 Purpose . 43
6.11.2 Apparatus . 43
6.11.3 Procedure . 43
6.11.4 Restrictions and exceptions . 43

– 4 – IEC 62093:2022 © IEC 2022
6.11.5 Requirements . 43
7 Optional tests . 44
7.1 General . 44
7.2 Rain intrusion test . 44
7.2.1 Purpose . 44
7.2.2 Apparatus . 44
7.2.3 Procedure . 44
7.2.4 Restrictions and exceptions . 45
7.2.5 Final measurements . 45
7.2.6 Requirements . 45
7.3 Wind driven rain test . 46
7.3.1 Purpose . 46
7.3.2 Apparatus . 46
7.3.3 Procedure . 46
7.3.4 Restrictions and exceptions . 47
7.3.5 Final measurements . 47
7.3.6 Requirements . 47
7.4 Dust test . 47
7.4.1 Purpose . 47
7.4.2 Apparatus . 48
7.4.3 Procedure . 48
7.4.4 Exceptions and restrictions . 48
7.4.5 Requirements . 48
7.5 Shipping vibration test . 49
7.5.1 Purpose . 49
7.5.2 Apparatus . 49
7.5.3 Procedure . 50
7.5.4 Restrictions and exceptions . 50
7.5.5 Final measurements . 50
7.5.6 Requirements . 50
7.6 Shock test . 50
7.6.1 Purpose . 50
7.6.2 Apparatus . 50
7.6.3 Procedure . 50
7.6.4 Restrictions and exceptions . 51
7.6.5 Final measurements . 51
7.6.6 Requirements . 51
7.7 Salt mist test . 51
7.7.1 Purpose . 51
7.7.2 Apparatus . 51
7.7.3 Procedure . 51
7.7.4 Restrictions and exceptions . 52
7.7.5 Final measurements . 52
7.7.6 Requirements . 52
7.8 Mixed gas corrosion test . 52
7.8.1 General . 52
7.8.2 Apparatus . 52
7.8.3 Procedure . 52
7.8.4 Restrictions and exceptions . 52

7.8.5 Final measurements . 52
7.8.6 Requirements . 52
7.9 Ammonia corrosion test . 53
7.9.1 Purpose . 53
7.9.2 Apparatus . 53
7.9.3 Procedure . 53
7.9.4 Final measurements . 53
7.9.5 Requirements . 53
8 Report . 53
Annex A (normative) Specification of tests performed for reporting . 55
Bibliography . 56

Figure 1 – Test sequence for PCEs of Categories 1 to 4 . 17
Figure 2 – Alternative test sequence for Category 3 PCE . 18
Figure 3 – Chamber temperature/humidity profile and power for humidity freeze test . 32
Figure 4 – Thermal cycling test – Temperature and output power profile . 35
Figure 5 – Damp heat test profile . 39
Figure 6 – Dry heat test – Temperature and input voltage profile . 41
Figure 7 – Reference for dust accumulation evaluation level . 49

Table 1 – Testing sample quantity . 14
Table 2 – Environmental condition classifications . 15
Table 3 – Summary of test levels (main test sequence) . 19
Table 4 – Summary of test levels (optional tests) . 20
Table 5 – Temperature and humidity limits for humidity freeze test . 33
Table 6 – Upper and lower temperature limits for thermal cycling test . 36
Table 7 – Temperature and humidity limits for damp heat test. 39
Table 8 – Temperature limits for dry heat test . 42

– 6 – IEC 62093:2022 © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PHOTOVOLTAIC SYSTEM POWER CONVERSION EQUIPMENT –
DESIGN QUALIFICATION AND TYPE APPROVAL

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
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6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 62093 has been prepared by IEC technical committee 82: Solar photovoltaic energy
systems. It is an International Standard.
This second edition cancels and replaces the first edition published in 2005. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Title modified.
b) This edition focusses on the design qualification of power conversion electronics (PCE), and
eliminates the clauses associated with qualification testing of other balance of system
components.
c) While many clause titles remain the same as the first edition, substantial changes have been
made.
d) Whereas the first edition establishes requirements for the design qualification of balance-
of-system components used in terrestrial photovoltaic (PV) systems, this edition is limited
to power conversion equipment.

e) The test protocols have been changed.
The text of this International Standard is based on the following documents:
Draft Report on voting
82/1963/FDIS 82/1983/RVD
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 International Standard 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/standardsdev/publications.
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,
• replaced by a revised edition, or
• amended.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.

– 8 – IEC 62093:2022 © IEC 2022
PHOTOVOLTAIC SYSTEM POWER CONVERSION EQUIPMENT –
DESIGN QUALIFICATION AND TYPE APPROVAL

1 Scope
This document lays down IEC requirements for the design qualification of power conversion
equipment (PCE) suitable for long-term operation in terrestrial photovoltaic (PV) systems.
This document covers electronic power conversion equipment intended for use in terrestrial PV
applications. The term PCE refers to equipment and components for electronic power
conversion of electric power into another kind of electric power with respect to voltage, current,
and frequency. This document is suitable for PCE for use in both indoor and outdoor climates
as defined in IEC 60721-3-3 and IEC 60721-3-4. Such equipment may include, but is not limited
to, grid-tied and off-grid DC-to-AC PCEs, DC-to-DC converters, battery charger converters, and
battery charge controllers.
This document covers PCE that is connected to PV arrays that do not nominally exceed a
maximum circuit voltage of 1 500 V DC. The equipment may also be connected to systems not
exceeding 1 000 V AC at the AC mains circuits, non-main AC load circuits, and to other DC
source or load circuits such as batteries. If particular ancillary parts whereby manufacturers
and models are specified in the manual for use with the PCE, then those parts are tested with
the PCE.
Exceptions:
a) This document does not address characteristics of power sources other than PV systems,
such as wind turbines, fuel cells, rotating machine sources, etc.
b) This document does not address the characteristics of power electronic conversion
equipment fully integrated into photovoltaic modules. Separate standards exist or are in
development for those types of devices. It is, however, applicable to devices where the
manufacturer explicitly specifies the capability of full detachment from and subsequent
reattachment to the PV module or if the input and output terminals can be accessed and a
specification sheet for the PCE is available. Devices meeting these requirements may be
tested as individual samples independent from the PV module.
c) This document does not apply to power conversion equipment with integrated (built-in)
electrochemical energy storage (e.g. lead acid or lithium-ion). It is, however, applicable to
equipment where the manufacturer specifies and permits complete removal of the
electrochemical energy storage from the PCE so that stand-alone assessment of the PCE
with the storage removed becomes possible.
The object of the test sequences contained herein is to establish a basic level of durability and
to show, as far as it is possible within reasonable constraints of cost and time, that the PCE is
capable of maintaining its performance after prolonged exposure to the simulated environmental
stresses described herein that are based on the intended use conditions specified by the
manufacturer. Optional tests contained herein may be selected depending on the intended
installation, market, or special environmental conditions that the PCE is anticipated to
experience. The categorization imposes differentiated test sequences and test severity levels
reflecting the different requirements of mechanical and electrical components in different
environments.
PCEs are grouped into categories based on size and installation environment.
The actual life expectancy of components so qualified depends on their design, their
environment, and the conditions under which they are operated. Estimation of a lifetime and
wear out is not generally covered by this document.

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 60068-2-2:2007, Environmental testing – Part 2-2: Tests – Test B: Dry heat
IEC 60068-2-6, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)
IEC 60068-2-14, Environmental testing – Part 2-14: Tests – Test N: Change of temperature
IEC 60068-2-27, Environmental testing – Part 2-27: Tests – Test Ea and guidance: Shock
IEC 60068-2-52, Environmental testing – Part 2-52: Tests – Test Kb: Salt mist, cyclic (sodium,
chloride solution)
IEC 60068-2-60:2015, Environmental testing – Part 2-60: Tests – Test Ke: Flowing mixed gas
corrosion test
IEC 60068-2-68, Environmental testing – Part 2-68: Tests – Test L: Dust and sand
IEC 60068-2-78, Environmental testing – Part 2-78: Tests – Test Cab: Damp heat, steady state
IEC 60068-3-5:2018, Environmental testing – Part 3-5: Supporting documentation and guidance
– Confirmation of the performance of temperature chambers
IEC 60068-3-6, Environmental testing – Part 3-6: Supporting documentation and guidance –
Confirmation of the performance of temperature/ humidity chambers
IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)
IEC 60529:1989/AMD1:1999
IEC 60529:1989/AMD2:2013
IEC 60721-3-3, Classification of environmental conditions – Part 3-3: Classification of groups
of environmental parameters and their severities – Stationary use at weather protected
locations
IEC 60721-3-4, Classification of environmental conditions – Part 3-4: Classification of groups
of environmental parameters and their severities – Stationary use at non-weather protected
locations
IEC 61000-3-2, Electromagnetic compatibility (EMC) – Part 3-2: Limits – Limits for harmonic
current emissions (equipment input current ≤16 A per phase)
IEC 61000-3-12, Electromagnetic compatibility (EMC) – Part 3-12: Limits – Limits for harmonic
currents produced by equipment connected to public low-voltage systems with input current >16
A and ≤75 A per phase
IEC TR 61000-3-14, Electromagnetic compatibility (EMC) – Part 3-14: Assessment of emission
limits for harmonics, interharmonics, voltage fluctuations and unbalance for the connection of
disturbing installations to LV power systems
IEC 61180, High-voltage test techniques for low-voltage equipment – Definitions, test and
procedure requirements, test equipment

– 10 – IEC 62093:2022 © IEC 2022
IEC 61557-1, Electrical safety in low voltage distribution systems up to 1 000 V AC and
1 500 V DC – Equipment for testing, measuring or monitoring of protective measures – Part 1:
General requirements
IEC TS 61836, Solar photovoltaic energy systems – Terms, definitions and symbols
IEC 62109-1:2010, Safety of power converters for use in photovoltaic power systems – Part 1:
General requirements
IEC 62116:2014, Utility-interconnected photovoltaic inverters – Test procedure of islanding
prevention measures
IEC 62477-1:2012, Safety requirements for power electronic converter systems and equipment
– Part 1: General
IEC 62477-1:2012/AMD1:2016
IEC 62716:2013, Photovoltaic (PV) modules – Ammonia corrosion testing
IEC 62852, Connectors for DC-application in photovoltaic systems – Safety requirements and
tests
IEC 62894:2014, Photovoltaic inverters – Data sheet and name plate
IEC 62894:2014/AMD1:2016
IEC TS 63106-2, Basic requirements for simulator used for testing of photovoltaic power
conversion equipment – Part 2: DC power simulator
ISO 4892-2, Plastics – Methods of exposure to laboratory light sources – Part 2: Xenon-arc
lamps
ISO 12103-1:2016, Road vehicles – Test contaminants for filter evaluation – Part 1: Arizona
test dust
ISO 22479:2019, Corrosion of metals and alloys – Sulfur dioxide test in a humid atmosphere
(fixed gas method)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC TS 61836 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online platform: available at http://www.iso.org/obp
NOTE Symbols and variable names for PCE input and output values follow the terminology of IEC 62894.
3.1
power conversion equipment
PCE
electrical device converting one kind of electrical power from a voltage or current source into
another kind of electrical power with respect to voltage, current and frequency
Note 1 to entry: Examples include AC-DC converters, DC-AC inverters, DC-DC charge controllers, frequency
converters, etc.
3.2
module-level power electronics: Category 1 PCE
MLPE
referring to PCE that is specified by the manufacturer to operate on a PV module basis,
interfacing with up to four individual PV modules
3.3
string-level power electronics: Category 2 PCE
category comprising PCE that is designed to interface more than four series- and/or parallel-
connected PV modules and not meeting the conversion power of the Category 3 PCE or
Category 4 PCE definition
3.4
large-scale power electronics: Category 3 PCE
category comprising PCE predominantly in a single unit capable of power conversion equal to
or greater than 100 kVA and less than 1 000 kVA
Note 1 to entry: This class of PCE may have multiple power conversion units built into the larger containing unit.
3.5
central large-scale power electronics: Category 4 PCE
category comprising PCE predominantly in a single enclosure capable of power conversion
equal to or greater than 1 000 kVA
Note 1 to entry: This class of PCE may have multiple power conversion units built into the larger containing unit.
3.6
derating temperature
ambient temperature limit at which the PCE starts to actively curtail its input and output power
to maintain a certain maximum operating temperature
Note 1 to entry: This temperature may also depend on input power and other electrical parameters, and thus may
not be unique.
3.7
electrically independent inputs
ports for input of power to the PCE that are not ohmically connected to one another internally
but serve to supply power to the PCE at different operating points of current and voltage at the
same time provided by, for example, a boost converter stage in the PCE for each such
electrically independent input
3.8
enclosure
part of the equipment which surrounds internal parts, intended to provide protection against
external influences, against the spread of fire, or against access to hazards
Note 1 to entry: Enclosures may be free standing, wall, rack, ceiling, frame or skid mounted.
3.9
maximum total PV array short circuit current
I
sc max
absolute maximum total PV array short circuit current (DC) that the PCE is rated to have
connected to its PV input, under most severe-case conditions of ambient temperature,
irradiance, etc.
Note 1 to entry: This rating of the PCE refers to the absolute maximum current the PV input to the PCE is designed
for under conditions of expected use. This differs from the simple sum of the marked I ratings of the connected PV
sc
modules, since those markings are based on short-circuit conditions under standard test conditions, and may be
exceeded at high temperatures or with irradiance above the standard level.

– 12 – IEC 62093:2022 © IEC 2022
3.10
rated
value assigned, generally by a manufacturer, to a specified operating condition of a component,
device or equipment
3.11
rated input voltage
V
dc,r
rated input voltage specified by the manufacturer, or if not specified, the midpoint of the
maximum power point (MPP) input voltage range of the PCE
3.12
rated power
P
r
maximum active power the PCE can deliver in continuous operation
3.13
maximum power point voltage
maximum MPP voltage
V
mpp max
maximum voltage at the DC input port at which the inverter can deliver its rated power
continuously without power curtailing
3.14
minimum MPP voltage
V
mpp min
minimum voltage at the DC input port at w
...