Outdoor Performance of 10 year Old a-Si and Poly-Si Modules in southern Norway conditions

The outdoor performance of 10 years modules has been measured in southern Norway conditions. For this study, Poly-Si and a-Si modules are selected and the measurements are carried out using a portable electronic load. The I-V characteristics and maximum power have been recorded for several modules of each technology. It is found that Poly-Si modules perform very well even after 10 years of span whereas some of a-Si modules have visual degradation which causes significant power losses. The experimentally outdoor monitored values of P
_mp
, V
_mp
, short circuit current (I
_sc
), Open circuit voltage (V
_oc
) and efficiency for different modules are compared with manufacturer's values.