2013/7/25
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2.6 Performance of PV Modules
A PV module may produce more current and/or voltage than reported at STC. Sunny, cool
weather and reflection from snow or water can increase current and power output.
Therefore, the values of Isc and Voc shown below should be multiplied by a factor of 1.25
when determining component voltage ratings, conductor capacities, fuse sizes, and size of
controls connected to PV output. An additional 1.25 multiplier may be required by the NEC
for sizing fuses and conductors as described in the NEC section 690.8.
While module current depends on solar irradiance, module voltage will vary depending on
device temperature. This means overall production will vary depending on solar radiation, the
temperature of the cells/module and the equipment to which they are connected.
