When I designed my solar system, I used NREL's PV Watts calculator to determine sizing. My solar system is on its 5th full day of energy production and I'm watching what was calculated (via PV Watts) vs what I'm really getting..
Obviously, five days of data is not even remotely close enough to make any determinations but there are certain things I can decipher. For instance, when I scan the PV Watts hourly data spreadsheet to see what my panels should be producing under full sun at noon, I can scroll the entire month and see what the highest PV Watts estimated numbers are and then compare my panels to those numbers when they're under full sun at noon. Again, not super accurate as I'm sure temperature and humidity in the air will make a difference..
I'm curious as to the results others have when it comes to months or years of data.. Did you come in over the PV Watts estimations or under.... and by how much?
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