pv magazine test is designed to help investors in their module purchasing process, while at the same time allowing manufacturers to spot problems and improve their production processes. The measurements are carried out in GSolar’s test laboratory in Xi’an, China. To ensure the quality of Gsolar’s tests, pv magazine chose CEA as a partner. CEA acts as an independent third- party expert, and monitors all steps of the testing program to ensure that measurement protocols are respected.
|module model and characteristics||Mono n-Pert double glass bifacial||Poly||Mono PERC||Mono PERC|
|Date of publication||09/2017||11/2017||02/2018||03/2018|
|Time of test||Aug 2017 to Oct 2017||Aug 2017 to Oct 2017||Jan 2018||Feb 2018|
|Grade Weights||Visual inspection (10%)||46||75||100||100|
|EL image inspection (10%)||100||77||100||100|
|Low irradiance efficiency loss (25%)||89||73||82||75|
|Pmax temperature coefficient (25%)||78||72||66||81|
|PID loss (30%)||81||81||81||93|
|Download full test report||Download full test report||Download full test report||Download full test report|
Modules are given a grade from 0 to 100 points for each test. In calculating the average grade of the module, each individual test grade is given a certain weighting as shown in the table. The tests “Visual inspection” and “EL image inspection” each get a 10% weighting, while the tests “Low irradiance efficiency loss” and “Pmax temperature coefficient” each receive a 25% weighting. Given the importance of PID resistance, the test for “PID loss” receives the highest weighting, namely 30%.
* Jolywood use its own method in determining the nominal power, in the absence of an IEC standard for bifacial modules
The following two articles explain the relevance of each test procedure. Please be aware, that we have changed the test grading system after publication from a letter-based system to a numeric system (0 to 100). Accordingly, the following two articles in the September 2017 issue of pv magazine (global edition) still use the original letter-based system.
The new module test
Module reliability: pv magazine’s new module test is kicking off. The first candidate is Jolywood with its bifacial n-Pert module. The test is designed to help investors in their module purchasing process, while at the same time allowing manufacturers to spot problems and improve their production processes.
Method for the modules
Testing methodology: George Touloupas, Director of Technology and Quality at CEA, gives a detailed account of the methodology behind pv magazine test, and explains the results from the first round of testing.