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Most common errors

Common Errors of PV Plants

 

Common errors of PV plants

Which defects can occur at a PV Plant, and how can they be detected?

Selection of possible errors and defects:

PID

 

Potential or light induced degradation reduce the performance continually, without being noticed. And without constant voltage measurement in the module, PID recognition in the field is simply impossible.

Common detection: Electroluminescence / open-circuit voltage measurements
Necessary requirements: Plant inspecton / good access to the modules

Detection by SunSniffer: Measurement and analysis of module voltage


One defective diode reduces modules voltage to 66%, two defective diodes down to 33%. This is not noticeable without measurement of modules voltages.

Common detection: Junction box opening / open-circuit voltage measurements
Necessary requirements: Plant inspecton / good access to the modules

Detection by SunSniffer: Measurement and analysis of module voltage

 
 

Badly-soldered connections or structural defects in the cell cause selective heat productions at those spots. Any hot spot is a power leakage. 

Common detection: IR-thermography / visual inspection
Necessary requirements: Plant inspecton / good access to the modules

Detection by SunSniffer: Measurement and analysis of module voltage

 

Hail can cause serious defects of cells. Cracks in a cell may be small, but can cause or accelerate degradation.

Common detection: Electroluminescence / visual inspection
Necessary requirements: Plant inspecton / good access to the modules

Detection by SunSniffer: Measurement and analysis of module voltage

 

Further information:

Solar Bankability


Internationale Energie Agentur


Fraunhofer CSP


TÜV Rheinland


ZAE Bayern


DLR / NEXT ENERGY

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We are constantly developing our technology
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90489 Nürnberg
Germany

Phone: +49 (0)911 993 992 0
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