Outdoor power loss rate

4 FAQs about [Outdoor power loss rate]

What is performance loss rate (PLR)?

The performance loss rate (PLR) is a vital parameter for the time-dependent assessment of photovoltaic (PV) system performance and health state. Although this metric can be calculated in a relatively straightforward manner, it is challenging to achieve accurate and reproducible results with low uncertainty.

What is the relationship between degradation and performance loss rate?

Relation between degradation and performance loss rate—PLR expresses all losses as a single rate. Although rarely measured in commercial and utility power plants, continuous module IV curves may give attributes to what drives PLR.

What are the four steps of performance loss rate analysis?

The four steps are 1) input data cleaning and filtering, 2) performance metric selection (performance ratio (PR) or predicted power (P) based), corrections and data aggregation, 3) time series feature corrections and finally 4) application of a statistical modeling methods to determine the Performance Loss Rate value and its uncertainty.

Does a full system outage affect the resulting degradation rate?

Like the PV Fleet initiative approach, full system outages do not influence the resulting degradation rate. However, long-term trends in partial outages and factors like tracker errors would be rejected from the analysis.

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