Alliant Energy EPRI: Electric Power Research Institute
Madison Solar Demonstration Project
Madison Solar Demonstration Project

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About this website

This website was designed and developed by EPRI in collaboration with Alliant Energy, EPRI's Integration of Distributed Energy Resources and Solar programs, and EPRI's Power Delivery and Generation sectors.

Help: information about this page...

Component View

After reading the overview, try interacting with the comparison chart(s) to learn more about the data's characteristics and trends.

Panels

This page contains several panels: Performance Snapshot, Overview, etc. Tap or click the "?" button in the upper right corner of a panel to see more information about its content.

  1. Site Overview
  2. Weather
  3. Air (Outdoor Conditions)

Outdoor Air

Performance Snapshot
Performance Snapshot

This panel may show a sampled measurement (e.g., power) and/or a cumulative measurement (e.g., energy generated).

When the sampled measurement is available, a gauge and trend chart will appear.

When the cumulative measurement is available, its value will be shown over the date range indicated.

Sampled Value (Gauge and Chart)

Outdoor ambient air temperature

Outdoor Air Temperature
Outdoor Air Temperature (°F)
Overview
Enlarge Image

Air temperature can have either a positive of negative effect on PV power output. For example, a PV plant in a hot climate could experience reduced power generation in comparison to an identical plant with the same solar irradiance in a cooler climate.

Measurement Source

Temperature is measured with a resistance temperature detector, and relative humidity is measured with a capacitance type humidity sensor.

Time Series Profile
Time Series Profile

Chart (or charts) shows trends for a specific component. Each data point represents an aggregated value for the time interval indicated (e.g., 15-minute average).

Chart Navigation

Tap or click on the chart titles (if more than one shown) to switch the view between charts. The title of the displayed chart is highlighted in orange.

Zoom and Pan

To zoom in on and get a closer view of a plot area in a chart:

  • On a touchscreen: Use two fingers to spread apart (expand) the plot area, then use one finger to slide the plot area left and right.
  • Using a mouse: Click and drag to select a section of the plot area, then hold down the Shift key while dragging left and right.
  • Tap or click on the "Reset zoom" button to return the chart to its original size.

Toggle Legend Items

Tap or click on a legend item (if more than one shown) to hide or show its data in the plot area.

Measurements Plotted

Chart (or charts) includes one or more of the following measurements (indicated in the legend or title):

  • Outdoor ambient air temperature
  • Feels like (apparent) temperature represents wind chill or heat index; depends on air temperature, relative humidity, and wind speed
  • Outdoor ambient relative humidity

Preset Date Ranges

Custom Date Range

to
Data are available from 4/1/2016 through 7/26/2020. Clear the end date to view the most recent data available.
Tip: click "?" (next to the Edit button) to learn how to interact with the chart.

Download Chart Data

Save chart data as a comma-separated values (CSV) file:
Note: timestamps (first column in the CSV file) are adjusted to your computer's time zone and represent the beginning of each interval.
Warning: downloading data is intended for desktop and laptop computers. This feature may not work for smartphones or tablets.
TEMPERATURE
OUTDOOR RELATIVE HUMIDITY
Daily Performance
Daily Performance

Chart (or charts) shows trends for a specific component. Each data point represents an aggregated value for the date indicated.

Chart Navigation

Tap or click on the chart titles (if more than one shown) to switch the view between charts. The title of the displayed chart is highlighted in orange.

Zoom and Pan

To zoom in on and get a closer view of a plot area in a chart:

  • On a touchscreen: Use two fingers to spread apart (expand) the plot area, then use one finger to slide the plot area left and right.
  • Using a mouse: Click and drag to select a section of the plot area, then hold down the Shift key while dragging left and right.
  • Tap or click on the "Reset zoom" button to return the chart to its original size.

Toggle Legend Items

Tap or click on a legend item (if more than one shown) to hide or show its data in the plot area.

Measurements Plotted

Chart (or charts) includes one or more of the following measurements (indicated in the legend or title):

  • Outdoor ambient air temperature
  • Feels like (apparent) temperature represents wind chill or heat index; depends on air temperature, relative humidity, and wind speed

Preset Date Ranges

Custom Date Range

to
Data are available from 4/1/2016 through 7/26/2020. Clear the end date to view the most recent data available.
Tip: click "?" (next to the Edit button) to learn how to interact with the chart.

Download Chart Data

Save chart data as a comma-separated values (CSV) file:
Note: dates (first column in the CSV file) are based on the site's geographic location, which may be different from your computer's time zone.
Warning: downloading data is intended for desktop and laptop computers. This feature may not work for smartphones or tablets.
TEMPERATURE
Monthly Performance
Monthly Performance

Chart (or charts) shows trends for a specific component. Each data point represents an aggregated value for the month indicated.

Chart Navigation

Tap or click on the chart titles (if more than one shown) to switch the view between charts. The title of the displayed chart is highlighted in orange.

Zoom and Pan

To zoom in on and get a closer view of a plot area in a chart:

  • On a touchscreen: Use two fingers to spread apart (expand) the plot area, then use one finger to slide the plot area left and right.
  • Using a mouse: Click and drag to select a section of the plot area, then hold down the Shift key while dragging left and right.
  • Tap or click on the "Reset zoom" button to return the chart to its original size.

Toggle Legend Items

Tap or click on a legend item (if more than one shown) to hide or show its data in the plot area.

Measurements Plotted

Chart (or charts) includes one or more of the following measurements (indicated in the legend or title):

  • Outdoor ambient air temperature
  • Feels like (apparent) temperature represents wind chill or heat index; depends on air temperature, relative humidity, and wind speed

Preset Date Ranges

Custom Date Range

to
Data are available from 4/1/2016 through 7/26/2020. Clear the end date to view the most recent data available.
Tip: click "?" (next to the Edit button) to learn how to interact with the chart.

Download Chart Data

Save chart data as a comma-separated values (CSV) file:
Note: dates (first column in the CSV file) are based on the site's geographic location, which may be different from your computer's time zone.
Warning: downloading data is intended for desktop and laptop computers. This feature may not work for smartphones or tablets.
TEMPERATURE
Cumulative Performance
Cumulative Performance

Chart (or charts) shows aggregated values for the date range indicated.

Chart Navigation

Tap or click on the chart titles (if more than one shown) to switch the view between charts. The title of the displayed chart is highlighted in orange.

Zoom and Pan

To zoom in on and get a closer view of a plot area in a chart:

  • On a touchscreen: Use two fingers to spread apart (expand) the plot area, then use one finger to slide the plot area left and right.
  • Using a mouse: Click and drag to select a section of the plot area, then hold down the Shift key while dragging left and right.
  • Tap or click on the "Reset zoom" button to return the chart to its original size.

Toggle Legend Items

Tap or click on a legend item (if more than one shown) to hide or show its data in the plot area.

Components Defined

These components appear in at least one chart (indicated in the legend):

    Measurements Plotted

    Chart (or charts) includes one or more of the following measurements (indicated in the legend or title):

      Image for Outdoor Air