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PVCHECK

EN - 15

5.2.3. Selection of the compensation relationship of temperature effects

This option allows selecting the relationship to be used to correct the measurements

performed according to the modules’ temperature as regards the calculation of nDC

efficiency. The following modes are available:

- T.Mod.: Correction factor Rfv2 related to PV module Temp. (Italian guideline CEI-82-25)

- T.Env: Correction factor Rfv2 related to environmental Temp. (Italian guideline CEI-82-25)

- nDC: nDC correction according to module temperature

CAUTION

If it’s performed a test according to Italian guideline it is recommended to select

“T.Env.” correction

Corr.

Type

Temperature used (Tcel) Calculation of nDC Ref.

T.Mod.

sTmoduli_MiTcel 

















C)40Tcel (se

100

40)-(Tcel- 1

C)40Tcel (se 1

fv2



hence

















STC

Rfv

nDC

CEI

82-

T.Env.

















800

Irr

20TambTcel NOCT

nDC

sTmoduli_MiTcel 



cel

STC

nDC 













 25

100



- - -

where:

Symbol Description

Measurin

g unit

Irradiance measured on PV module surface





W/m

STC

Standard Irradiance = 1000





W/m

Rated Power = sum of all Pmax values of the section of the PV plant being

measured





DC power measured at the PV generator’s output





2Rfv

Correction factor depending on the Temperature of PV Cells (Tcel) measured or

calculated according to the type of selected correction relationship



Absolute value of the thermal coefficient of Pmax of the PV modules included in the

plant section being measured.





C%/ 

NOCT

(Normal Operating Cell Temperature) = Temperature the cells under reference

conditions are brought to (800W/m

, 20°C, AM=1.5, air speed =1m/s).





C%/ 

For further details see § 11.1

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