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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