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|Title: ||Validation of proposed photovoltaic energy rating standard and sensitivity|
|Authors: ||Roy, Jyotirmoy|
Betts, Thomas R.
Kenny, Robert P.
Beyer, Hans G.
|Keywords: ||Energy rating|
|Issue Date: ||2008|
|Publisher: ||© WIP-Renewable Energies|
|Citation: ||ROY, J. ... et al, 2008. Validation of proposed photovoltaic energy rating standard and sensitivity. IN: Proceedings of the 23rd European Photovoltaic Solar Energy Conference, Valencia, Spain, September 2008.|
|Abstract: ||PV devices are currently compared on the basis of the power measurements, which might not be as
meaningful as a comparator as the energy yield. The energy rating standard proposed by the IEC promises to
overcome this shortcoming. It has been implemented in three institutes and the issues with the current drafts are
The data required as the input for the energy rating is normally not available and synthetic datasets will have to be
used or parts need to be estimated for validation studies. The validation against outdoor data shows that the
uncertainty of the input data, specifically the angular distribution of the diffuse irradiance, makes the energy
prediction part virtually not applicable for energy yield calculations. The validation effort shows a reduction of the
standard 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 their
application as they are not representative of realistic conditions; they are enveloping the possible environments. This
will in some cases over-emphasise the importance of certain effects, as their contribution to the overall energy yield
might be negligible.
Overall, the proposed standard represents an important advance on power rating. The standard is able to identify
differences in device technologies. Further work might be required to make the output more relevant to a wider
variety of users, though.|
|Description: ||This conference paper was presented at the 23rd EUPVSEC and is available from: www.photovoltaic-conference.com|
|Version: ||Closed access|
|Appears in Collections:||Closed Access (Mechanical, Electrical and Manufacturing Engineering)|
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