BS EN 60904-5:2011

INTRODUCTION
1 Scope and object
2 Normative references
3 Measurement principle and requirements
4 Apparatus
5 Determination of required input parameters
6 Procedure
7 Calculation of equivalent cell temperature
8 Test report
Annex ZA (normative) - Normative references to international
         publications with their corresponding European
         publications

Specifies 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.

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.