BS EN IEC 60904-9:2020 pdf free.Photovoltaic devices. Classification of solar simulator characteristics. BS EN IEC 60904-9 IEC standards for photovoltaic devices require the use of specific classes of solar simulators deemed appropriate for specific tests. Solar simulators can be either used for performance measurements of PV devices or endurance irradiation tests. This part of IEC 60904 provides the definitions of...