Real-Time Series Resistance Monitoring in PV Systems Without the Need for IV Curves

Research output: Contribution to conferencePaperpeer-review

8 Scopus Citations


We apply the physical principles of a familiar method, suns-Voc, to a new application: the real-time detection of series resistance changes in modules and systems operating outside. The real-time series resistance (RTSR) method that we describe avoids the need for collecting IV curves or constructing full series-resistance-free IV curves. RTSR is most readily deployable at the module level on micro-inverters or module-integrated electronics, but it can also be extended to full strings. Automated detection of series resistance increases can provide early warnings of some of the most common reliability issues, which also pose fire risks, including broken ribbons, broken solder bonds, and contact problems in the junction or combiner box. We describe the method in detail and describe a sample application to data collected from modules operating in the field.

Original languageAmerican English
Number of pages4
StatePublished - 14 Dec 2015
Event42nd IEEE Photovoltaic Specialist Conference, PVSC 2015 - New Orleans, United States
Duration: 14 Jun 201519 Jun 2015


Conference42nd IEEE Photovoltaic Specialist Conference, PVSC 2015
Country/TerritoryUnited States
CityNew Orleans

Bibliographical note

Also published in the IEEE Journal of Photovoltaics: see NREL/JA-5J00-64382

NREL Publication Number

  • NREL/CP-5J00-66355


  • Monitoring
  • Photovoltaic
  • Reliability
  • Series resistance


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