In this document
You'll learn how to read the 15-minute charts in the project's Analysis section: the monthly histogram of 15-minute values with its percentile bands, and the histogram of signed and unsigned 15-minute changes used to judge short-term fluctuation and battery sizing.
The 15-minute values charts show your project's data at the shortest available time step, revealing short-term fluctuation that coarser charts smooth away. Their availability depends on the location and the temporal granularity of its dataset.
For the other chart groups and an introduction to the Analysis section, see How to read the charts.
Monthly histogram of 15-minute values
Solar resources | Climate | |
|---|---|---|
Chart included for | GHI, DNI, GTI | N/A |
The hostogram represents daily averages of the given parameter with percentiles stated in the textual format within the chart. The grey area with middle line depicts average and standard deviation. This chart's availability depends on location and its dataset granularity.
The values written inside the chart show the percentiles.
Unit | |
|---|---|
X-axis | Respective parameter values |
Y-axis | Percentage of days |
How to use it
The x-axis of the chart indicates how far values go in every month, and they depict instant values, not averages.
If, for example, values in a chart representing July in the northern hemisphere (summer month) are mostly in the lower range, it may indicate that it is often cloudy and that, despite summer, energy production is much lower than expected.
If charts are almost identical for all months, it may indicate that energy production could be consistent throughout the whole year (for example, desert areas in Africa).
Monthly histogram of 15-minute signed/unsigned changes
Solar resources | Climate | |
|---|---|---|
Chart included for | GHI, DNI, GTI | N/A |
The charts represent histograms of 15-minute signed (positive and negative values)/unsigned (absolute value of positive and negative values) parameter changes respectively. It depicts percentage of days parameter changed by a certain amount.
Unit | |
|---|---|
X-axis | Respective parameter values |
Y-axis | Percentage of days |
How to use it
You can use the signed chart to note the range the values reach in every month. Values closer to zero indicate low fluctuation in values, while a wider chart shows the values changing more significantly within a single month.
This knowledge may help you to determine what battery size would be appropriate for the location.