Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
You're getting these warnings because EP Weather thinks that the solar radiation on those hours seems excessive. If these are calculated by EP Weather, the cause is probably the Z-H model and not the Perez model, since the Perez model always calculates the direct normal as a fraction of the global horizontal (* sine solar angle, etc.). Extraterrestrial solar is 1346, so 1550 is clearly too much. I've been saying that the Z-H model in EP Weather is a very early version. In 2010 or so, I added limits so that the calculated solar cannot be more than 0.90 nor less than 0.10 of the extraterrestrial. I've also spent quite a bit of time to refine the model to get rid of spikes, but I doubt any of that has made it into EP Weather.
