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PV devices are currently compared on the basis of the power measurements, which might not be asmeaningful as a comparator as the energy yield. The energy rating standard proposed by the IEC promises toovercome this shortcoming. It has been implemented in three institutes and the issues with the current drafts areevaluated.The data required as the input for the energy rating is normally not available and synthetic datasets will have to beused or parts need to be estimated for validation studies. The validation against outdoor data shows that theuncertainty of the input data, specifically the angular distribution of the diffuse irradiance, makes the energyprediction part virtually not applicable for energy yield calculations. The validation effort shows a reduction of thestandard deviation in the measurements, indicating that all environmental effects are considered.The evaluation of the originally proposed standard days shows that there is little information to be gained in theirapplication as they are not representative of realistic conditions; they are enveloping the possible environments. Thiswill in some cases over-emphasise the importance of certain effects, as their contribution to the overall energy yieldmight be negligible.Overall, the proposed standard represents an important advance on power rating. The standard is able to identifydifferences in device technologies. Further work might be required to make the output more relevant to a widervariety of users, though.

Validation of Proposed Photovoltaic Energy Rating Standard and Sensitivity to Environmental Parameters