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Clear Sky Calculator

Clear Sky Calculator

by Apogee Instruments

2 ratings
1 review
🔧 Utilities
💼 Business
Free

Details

  • Released
  • Updated
  • April 4, 2015
  • September 28, 2021

Features

Developer

Apogee Instruments
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About

This tool estimates solar radiation intensity on a horizontal surface for any location and time. It helps determine the need for recalibration of radiation sensors by comparing their measurements to calculated clear sky values. Accuracy is high when used near solar noon in summer.

✓Estimates solar radiation intensity
✓Determines sensor recalibration needs
✓Global location and time support
✓Uses ASCE Standardized Reference Evapotranspiration Equation
✓Requires minimal input data
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What's New in Clear Sky Calculator

2.0.5

September 28, 2021

Added ePAR option

User reviews

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Lots of uses

This product is excellent for applications in addtion to calibrating Apogee instruments.

It is valuable for evaluating small solar charging systems. If the rated output of the solar system is not being achieved, you can use this tool to help determine why. The solar charging system power was determined using an irradiance of 1000 w/m2. The irradaince, for your test location, can be determined by this application if you have a clear day.
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FAQ

What is the Clear Sky Calculator used for?

The Clear Sky Calculator is used to estimate the intensity of solar radiation incident on a horizontal surface. This estimation helps users determine if their radiation sensors, such as pyranometers and quantum sensors, need recalibration.

How accurate is the Clear Sky Calculator?

When used near solar noon over multiple clear, unpolluted days during spring and summer months, the accuracy is estimated to be ± 4% globally. Specific examples show measured radiation closely tracking modeled values.

What information do I need to use the Clear Sky Calculator?

The calculator requires site elevation, latitude, longitude, reference longitude, air temperature, and relative humidity measurements or estimates. These inputs are generally easy to obtain.

Does the Clear Sky Calculator work on all devices?

The Clear Sky Calculator is available for iPhone, iPad, and iPod. It is designed to be accessible on Apple's mobile operating systems.

How often is the Clear Sky Calculator updated?

The latest version, 2.0.5, was last updated on September 28, 2021. While not updated frequently, the core functionality remains stable for its intended purpose.

Is the Clear Sky Calculator free to use?

Yes, the Clear Sky Calculator is completely free to download and use. There are no in-app purchases or subscription fees associated with it.

What is the age rating for the Clear Sky Calculator?

The Clear Sky Calculator has an age rating of 4+. This indicates it is suitable for users of all ages, with no content restrictions.

What is the developer of the Clear Sky Calculator?

The Clear Sky Calculator is developed by Apogee Instruments, a company specializing in scientific instrumentation.