title: How to interpret inverter power value?
body: <p>I am measuring the power an inverter is currently producing and I display three different icons. If the inverter can produce a maximum of 5.000W, my ranges could look like this: &lt;1.500 -> cloud, &lt;3.500 -> partly cloudy, >=3.500 -> sun. </p>
  
  <p>This approach has one big drawback, as weather, time of the year and time of the day affect the power generation. </p>
  
  <p>Is there a web service that tells me the current weather in my town?
  As I know the current date, how could I vary the three ranges in regards to the time of the year?</p>
  
  <p>Cheers!</p>