Photovoltaic devices – Part 5: Determination of the equivalent cell temperature (ECT) of photovoltaic (PV) devices by the open-circuit voltage method

Published by	Publication Date	Number of Pages
IEC	02/17/2011	20

Category: IEC

Description

IEC 60904-5 Ed. 2.0 b – Photovoltaic devices – Part 5: Determination of the equivalent cell temperature (ECT) of photovoltaic (PV) devices by the open-circuit voltage method

IEC 60904-5:2011 describes the preferred method for determining the equivalent cell temperature (ECT) of PV devices (cells, modules and arrays of one type of module), for the purposes of comparing their thermal characteristics, determining NOCT (nominal operating cell temperature) and translating measured I-V characteristics to other temperatures. The main technical changes with regard to the previous edition are as follows:
– added method on how to extract the input parameters;
– rewritten method on how to calculate ECT;
– reworked formulae to be in line with IEC 60891.