UI-Kennlinienmeßgerät für Solarmodule und -generatoren

pvengineering

UI-Kennlinienmeßgerät für Solarmodule und -generatoren

PVPM Users Manual Page 45

Reasons for decreased Power and Yield of PV Generators

11 Reasons for decreased Power and Yield of PV

Generators

Error To be detected by: Possible reason / workaround

System configuration chosen

inadequately

Erroneous match of strings

and inverter

Measurement of mismatch

losses

Fed power too low for location

and in relation to nominal

generator power

Cast shadow I-V-curve shows "bulge", peak

power too low, optical check

Diffuse shading (may be

hardly visible for bare eye!)

I-V-curve is "impressed", peak

power too low

Corrosion at plugs and cables Serial internal resistance Rs

too high

Delamination of cell

embedding

Design fault / redesign

Design fault / redesign,

replacement of inverters

Barrier near module (e.g. tree,

chimney, birds excrements) /

remove barrier

Barrier in some distance to

module (high portion of diffuse

light) / remove barrier

Material, planning or mounting

fault / Clean, replacement

see shading diffuse Material / production fault /

Replacement

Bubbling in resin see shading diffuse Material defect / replacement by

supplier

Transparent covering material

(glass, plastics, resin)

becomes blind

Discolouring of the

transparent cover material

(plastics, resin)

Intrusion of water into the

laminate, leads to other

problems (corrosion,

discolouring)

Faults in the crystalline

structure of single cells (hotspot

effect)

Pollution of the module by

dust

Moss / algae on module,

birds excrements

Optical check, peak power too

low (s. a. shading diffuse)

Optical check, peak power too

low (s. a. shading diffuse)

Material defect / replacement by

supplier

Material defect / replacement by

supplier

Optical check Material or production fault /

replacement by supplier

see shading diffuse Production fault / reduction of

price, replacement by supplier

Optical check, see shading

diffuse

High dust impact. Check modules

periodically / cleaning

see cast shadow Normal for several regions /

cleaning

Broken cover glass, leads to Optical check Hailstorm, mounting or

PV-Engineering GmbH

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