PV System Availability from Commercial and Utility-Scale Systems

Research output: NRELPresentation


In the PV Fleet Performance Data Initiative, we partner with photovoltaic (PV) fleet owners to collect time-series PV production data, and publish aggregated, anonymized results. An assessment of system availability is conducted on 1128 systems which passed our data quality checks, and include cumulative energy meter data. Overall inverter availability is low in the first 6 months of system performance before reaching steady-state by the end of the first year. System-level aggregated data shows a median (P50) system availability of 0.99, and a lower P90 value of 0.95. A dependence on system size is also identified, with worse inverter availability results for larger PV systems. Potential causes of this effect are under investigation.
Original languageAmerican English
Number of pages20
StatePublished - 2024

NREL Publication Number

  • NREL/PR-5K00-88590


  • availability
  • degradation
  • performance index
  • PV fleet
  • PV system
  • soiling


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