It’s the trend line over a longer period of time that gives the best overview of the transmission loss.
The spikes visible are due to morning and evening dew. The bigger, longer lasting changes are the result of rain cleaning
the panel.
The DustIQ performs a measurement every minute but since the accumulation of dust is a slow process one doesn’t need
to read and record a measurement every minute and by using data from a weather station it is possible to select enough
valuable measurements per day to show the soiling build up trend line.
The above sample data shows the data collected in Morocco with daily dew and occasional rain. Still the trendline in
soiling build-up is clearly visible.
