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Metrel MI 3109 - Eurotest PV Lite Manual

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MI 3109 EurotestPV Lite Appendix E – PV measurements – calculated values
73
Depending on temperature criterion for PASS is:
If Tamb < 25 °C or Tcell < 40 °C => η2>0.85
If Tamb > 25 °C or Tcell > 40 °C => η2>(1-ηPV-0.08),
where ηPV is calculated depending on type of temperature being measured as
or
,
where NOCT is nominal operating temperature of the cell (data supplied by the
panels manufacturer) and γ is coeff. of temperature of power characteristic of PV
module (inserted value from 0,01 to 0,99) (data supplied by the panels
manufacturer).
NOCT nominal operating temperature of the cell (data supplied by the panels
manufacturer)
γ coeff. of temperature of power characteristic of PV module (inserted
value from 0,01 to 0,99) (data supplied by the panels manufacturer)
2. inverter:
A
C
D
C
P
P
.
Calculation of conversion efficiency with comparison of STC and measured-
corrected values
(U, I (AC, DC), phase, Irrstc, Tstc, Pnom, Irr, Tcell, Rs, α, β, Isc, M, N)
Panel:
Measured U and I are corrected to STC conditions:
11
111
(1) ()
() ()
STC
STC SC STC
STC S STC STC
Irr
III NTT
Irr
M
UU RIIMTT
N
 

,
where I1 and U1 are measured direct current and voltage at panel, Isc is measured short-
circuit current of panel, IrrSTC is irradiance at STC, Irr is measured irradiance, α and β
are the current and voltage temperature coeff. off panel, TSTC is temperature at STC, T1
is measured temperature, Rs is serial resistance of panel, M is number of modules in
serial and N is number of modules in parallel.
… 73


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