Describe the bug
From the help docs for both PVWatts and Detailed PV Model, it is not clear how tilt for 1-axis tracking systems is defined. Based on testing and assumptions, tilt appears to be defined as the angle measured sloping down towards the user-entered azimuth.
For example, if you wanted to model a North-South 1-axis tracker sloping down to the North (not ideal in the northern hemisphere, but maybe that's the natural slope of the land), I think you would have to enter an azimuth of 0 and then a tilt > 0. In that case, will the sign for tracker rotation angle in outputs be reversed? I think so, but only based on testing.
Expected behavior
More clear docs would be helpful.
Additional context
See pvlib/pvlib-python#1976 for some related discussion with pvlib.
Describe the bug
From the help docs for both PVWatts and Detailed PV Model, it is not clear how tilt for 1-axis tracking systems is defined. Based on testing and assumptions, tilt appears to be defined as the angle measured sloping down towards the user-entered azimuth.
For example, if you wanted to model a North-South 1-axis tracker sloping down to the North (not ideal in the northern hemisphere, but maybe that's the natural slope of the land), I think you would have to enter an azimuth of 0 and then a tilt > 0. In that case, will the sign for tracker rotation angle in outputs be reversed? I think so, but only based on testing.
Expected behavior
More clear docs would be helpful.
Additional context
See pvlib/pvlib-python#1976 for some related discussion with pvlib.