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MI 3108 EurotestPV Appendix E PV measurements calculated values
120
Appendix E PV measurements - calculated
values
Calculation with known U, I (DC, AC), configuration of modules into a string (M -
modules in serial, N - modules in parallel), environment parameters (Irr, T) and
data supplied by the panels manufacturer (U, I (AC, DC), phase, Istc, α, β, γ,
Pnom, NOCT, Irr, Irrstc, Tamb or Tcell)
Panel (DC):
Where for INVERTER measurements
for PANEL measurements
WP stands for DC Working Point of the inverter should be actual MPP of the
connected PV string but not necessary.
Inverter (AC):
3
,,
1
cos
AC meas i meas i i
i
P U I
U, I and phase are measured on inverter connectors, i is for multi-phase systems (i = 1
÷ 3).
Conversion efficiency:
1. panel:
Where measured output power of the panel at STC and
nominal output power of the panel at STC
, ,
where Pnom is nominal power of panel at STC, IrrSTC is nominal irradiance at STC (IrrSTC =
1000 W/m2), Irr is measured irradiance, M is number of modules in serial and N is
number of modules in parallel.
120


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