Historical
IEC 60904-5 Ed. 1.0 b:1993
Photovoltaic devices - Part 5: Determination of the equivalent cell temperature (ECT) of photovoltaic (PV) devices by the open-circuit voltage method
Describes the preferred method for determining the equivalent cell temperature of PV devices for the purposes of comparing their thermal characteristics, determining NOCT (nominal operating cell temperature) and translating measured I-V characteristics.
International Electrotechnical Commission [iec]