International Electrotechnical Commission
Glossary

ENlosses 
(Unit: W, J, though kWh is commonly used in the electrical industry)

electric power or energy that does not result in the service that is intended

NOTE 1 See also IEV 151-15-26

a) array capture losses

(Symbol: Lc)

normalised losses of a given PV system due to the energy losses of its PV array

NOTE 2 PV array capture losses are found from the difference between the reference yield and the PV array yield. These losses arise from mis-match losses, conversion losses, array soiling, etc

b) balance of system losses

(Symbol: LBOS)

normalised losses of a given PV system due to the energy losses of its BOS components

c) normalised losses

(Unit: J kW–1 Usually expressed as kWh kW–1 over any convenient unit of time. Commonly it is calculated over a day, which then gives a unit of h d–1)

duration that a PV device or PV system would need to operate at its rated power to compensate for the energy losses of that PV device or PV system

NOTE 3 Normalised losses are commonly calculated from a difference in given yields


TC/SC:82Terms     Info     Publications
Published in:IEC 61836, ed. 2.0 (2007-12) Terms     Info
Reference number:3.4.40

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