In this document
You'll learn how to read the monthly histogram of daily values in the project's Analysis section: what the columns, percentile bands, and cumulative distribution function show, and how to use the chart for system sizing and probabilistic yield estimates.
The daily charts show how your project's parameters are distributed across the days of each month. They tell you how often a parameter fell within a given range, which makes them useful for spotting variability and extremes that monthly averages hide.
For the other chart groups and an introduction to the Analysis section, see How to read the charts.
Monthly histogram of daily values
Solar resources | Climate | |
|---|---|---|
Chart included for | GHI, DNI, D2G, GTI | TEMP, RH, TD, WBT, WS, WG, AP, PREC |
The chart represents histograms of daily summaries/averages of the given parameter, respectively. Columns depict the percentage of days the parameter was within a certain range, and the black line shows the cumulative distribution function. The percentiles are displayed with dark grey and light grey color bands, respectively.
Unit | |
|---|---|
X-axis | Respective parameter values |
Y-axis (left) | Percentage value of days in the range (columns) |
Y-axis (right) | Cumulative distribution function (black line) |
How to use it
This chart reveals patterns of variability and extremes, helping to optimize system sizing, anticipate periods of over- or under-production every month, and plan for energy storage or supplementary power needs.
Different percentiles, such as p90, p50, and p75, provide a range of probabilistic energy yield estimates, helping in PV system design planning by offering a more comprehensive understanding of potential energy production under various conditions, facilitating risk assessment, financial modeling, and ensuring that the system is resilient to variations in solar resource availability.