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MI 3108 EurotestPV Appendix E PV measurements calculated values
122
Panel:
Measured U and I are corrected to STC conditions:
)())(1(
meas
STC
measSTCrelmeasSTC Irr
Irr
TTII
)())ln()((
_meas
STC
meas
STC
meas
STC
rel
measOC
meas
STC IIRs
Irr
Irr
TTUUU
nom
Rs
N
M
Rs
where Imeas and Umeas are measured direct current and voltage at panel, IrrSTC is
irradiance at STC, Irr is measured irradiance, α is irradiance correction factor, αrel and
βrel are the current and voltage temperature coeff. off panel, TSTC is temperature at STC,
Tmeas is measured temperature, Rs is serial resistance of panel / string, M is number of
modules in serial and N is number of modules in parallel.
Istc, Ustc
Calculated values of current and voltage at standard test condition
Imeas, Umeas
measured direct current and voltage at panel
Isc
measured short-circuit current of panel
Irrstc
irradiance at STC
Irr
measured irradiance
α
irradiance correction factor (typical 0,06)
αrel, βrel
current and voltage temperature coeff. of panel
Tstc
temperature at STC
Tmeas
measured temperature
Rsnom
serial resistance of module
Rs
serial resistance of string
M
number of modules in serial
N
number of modules in parallel
STC STC STC
P I U
122


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