(08-10-2017, 21:13)Werk_AG Wrote: Looking to the graphs in your webpages, seems you are getting a very close match with the theoretical values. Always make sure the pyranometer is perfectly horizontally levelled. There is small trick I read somewhere at the Apooge website. According to that trick, the side where the cable comes out of the unit, should be facing north, they say that doing it improves the readings.
It came with the leveling plate and built-in bubble level, and the cable is pointing directly north. So far I am happy with it.
My neighbor has an outside light that comes on at night. The owners manual suggests pointing a light source at the SP-110 to test it. Could that be the source of the readings I was getting last night after the sun went down? Either way it seems editing the code took care of the spurious readings at night.