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How is calculated the efficiency at STC?

Edd V. Asce

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As a general definition:

Efficency = Pmpp [W] / (Incid. Irrad [W/m2] * Ref area [m2]).

The reference area may be either the module area (usual module efficiency) or the sensitive area (which will give a "cell" efficiency, more related to the technology).

In the specific case of the STC efficiency mentioned on the loss diagram:

- Irrad = 1000 W/m2

- Pmpp = Impp * Vmpp issued from the application of the model at 25°C

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