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MI 3109 EurotestPV Lite Anhang E PV-Messungen Berechnungswerte
66
Anhang E PV-Messungen - Berechnungswerte
Berechnung anhand bekannter Größen U, I (DC, AC), Konfiguration der Module in
einen String (M - Serienmodule, N - Parallelmodule), Umgebungsparameter (Irr, T)
sowie Daten des Modulherstellers (U, I (AC, DC), Phase, Istc, γ, Pnom, NOCT, Irr,
Irrstc, Tamb oder Tcell)
Modul (DC):
3
,,
1
DC meas i meas i
i
P U I
,
U und I werden an den Modulsteckern gemessen, i giltr Multiphasensysteme (i = 1 ÷ 3).
Wechselrichter (AC):
3
,,
1
cos
AC meas i meas i i
i
P U I
U, I und Phase werden an den Wechselrichtersteckern gemessen, i gilt für
Multiphasensysteme (i = 1 ÷ 3).
Konversionseffizienz:
1. Modul:
2,
DC theo nom
theo STC
P Irr
P M N P
P Irr
,
mit Pnom als Nennleistung des Moduls bei STC, Irrstc als Nenn-Bestrahlungsstärke bei
STC (Irrstc = 1000 W/m2), Irr als gemessene Bestrahlungsstärke, M als Anzahl der in
Serie (Reihe) geschalteten Einzelmodule und N als Anzahl der parallel geschalteten
Einzelmodule.
η2
Effizienz des Moduls
Ptheo
Theoretische Leistung des Strings bei gemessener
Bestrahlungsstärke
Pnom
Nennleistung des Moduls bei STC
Irrstc
Nennwert der Bestrahlungsstärke bei STC (Irrstc = 1000 W/m2)
Irr
gemessene Bestrahlungsstärke
M
Anzahl der in Serie geschalteten Einzelmodule
N
Anzahl der parallel geschalteten Einzelmodule
66


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