Solar output equations


Greetings all
I would like to calculate the output for my panels, inputting the angle of the panels to the horizontal, their orientation, latitude and longitude and efficiency. And anything else required. I would like to get an equation, or equations, to generate the output on a minute by minute basis using an Excel spreadsheet. I would be grateful if anyone could either provide me with these equations, or point me to where I might find them.

I have looked at the “Your topic is similar to …” list from the system but none of the topics seem to address this issue.

best regards


That’s a bit outside the purpose of this website. Try PVWatts. I think you may be a little ambitious with minute by minute results though. Even the gold standard of PV Simulation software, PVSyst, typically calculates hour by hour.