Suncertainty

The Suncertainty app is developed by Kipp & Zonen, market leader in solar radiation measurement solutions.

Measurement uncertainty is the range of values within which the true value is asserted to lie with some level of confidence.
The uncertainty of a pyranometer measuring global irradiance depends upon many parameters.
Latitude, date and time determine the solar angle, which affects the directional response. Temperature affects the sensitivity and sky conditions influence thermal offsets and spectral response.
How the instrument is installed also has an influence, whether it is tilted or a ventilation unit is fitted.

This App will not only provide you with an uncertainty for your selected time of the day, but also make an estimate of the uncertainty in the total daily sum.