UI-Kennlinienmeßgerät für Solarmodule und -generatoren

pvengineering

UI-Kennlinienmeßgerät für Solarmodule und -generatoren

PVPM Users Manual Page 44

List of symbols

10 List of symbols

AM Air-Mass, relative way length for the sunlight through the atmosphere

of the earth

cT Temperature coefficient of the maximum power

E Irradiance

E0 1000 W/m2 (Irradiance at STC)

Eeff Irradiation, measured with a cristalline pv cell

EN 800 W/m2 (Irradiance for NOCT)

FF Fill factor

I Current

I0 Sperrstrom

Im Short form for Ipmax

Iph Photo current

Ipmax Current at Pmax

Ipmax0 Current at Pmax (at STC)

Isc Short circuit current

Isc0 Short circuit current (at STC)

m Normalized slope of the solar characteristic curve

M Slope of the characteristic curve at I=0

MPP Maximum Power Point, other description for Pmax

NOCT Nominal Operating Cell Temperature,

cell operating temperature at TambN and EN.

P Power

Pmax Actual maximum power of a solar cell

Ppk Peak-Power, maximum power of the solar cell at STC

R Resistance

Rp Parallel resistance

Rpv Photovoltaic resistance (calculation factor only, no real resistor)

Rs Serial resistance

STC Standard Test Conditions for the determination of Ppk

t Time

Tamb ambient temperature

TambN 20°C (ambient temperature for NOCT)

Tj0 25°C (cell temperature at STC)

Tmod actual Module temperature (at the backside of the module)

U Voltage

Um Short form for Upmax

Uoc Open circuit voltage

Uoc0 Open circuit voltage (at STC)

Upmax Maximum power voltage

PV-Engineering GmbH

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