International Electrotechnical Commission
Glossary

ENmaximum power 
(Symbol: Pmax, may also be known as Pmpp) (Unit: W)

power generated at the maximum power point

a) maximum power current

(Symbol: IPmax) (Unit: A)

electric current at the conditions of maximum power

b) maximum power irradiance coefficient

(Symbol: χ) (Unit: dimensionless)

ratio-change of the maximum power (Pmax1 / Pmax2) of a PV device as a function of the ratio-change of the natural logarithm of irradiance, ln(G1 / G2)

c) maximum power point

(Abbreviation: MPP)

point on a PV device's current-voltage characteristic where the product of electric current and voltage yields the maximum electrical power under specified operating conditions

d) maximum power point tracking

(Abbreviation: MPPT)

control strategy whereby PV array operation is always at or near the maximum power point

NOTE 1 See also "fixed voltage operation", 3.4.33

e) maximum power temperature coefficient

(Symbol: γ) (Unit: W K–1 (absolute), K–1 (relative))

change of the maximum power of a PV device per unit change of temperature

NOTE 2 Both absolute and relative values are used

NOTE 3 The user is advised to be aware of the difference between the absolute and the relative unit of measure, and to use the appropriate coefficient with the proper equation

f) maximum power under standard operating conditions

maximum power output of a PV device under standard operating conditions, SOC

NOTE 4 See also " conditions/standard operating conditions", 3.4.16d)

g) maximum power under standard test conditions

maximum power output of a PV device under standard test conditions, STC

NOTE 5 See also " conditions/standard test conditions", 3.4.16e)

h) maximum power voltage

(Symbol: VPmax) (Unit: V)

voltage at the conditions of maximum power

i) maximum power voltage under standard operating conditions

(Unit: V)

voltage at the maximum power point of a PV device under standard operating conditions, SOC

NOTE 6 See also " conditions/standard operating conditions", 3.4.16d)

j) maximum power voltage under standard test conditions

(Unit: V)

voltage at the maximum power point of a PV device under standard test conditions, STC

NOTE 7 See also " conditions/standard test conditions", 3.4.16e)


TC/SC:82Terms     Info     Publications
Published in:IEC 61836, ed. 2.0 (2007-12) Terms     Info
Reference number:3.4.42

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