To obtain a chart of the solar path in your area, see the University of Oregon website:http://solardat.uoregon.edu/SunChartProgram.html
It is of course not just the path of the sun, but what might be “in the way”, and your weather.
Are you going to track, or not?
Just thoughts, even with the greater amount of atmosphere due to the low angle, at 10 degrees above the horizon, there may be available up to 50% of the total solar power. If your panels are two feet wide, to not shade each other on the E/W axis when tilted to only 10 degrees up from the horizon, they must be spaced apart nearly twelve feet. If you limit your morning/evening aim to 30 degrees above the horizon the panels need to be spaced only four feet apart. Depending upon factors such as your latitude, time of the year, and physical barriers, the difference between ten and thirty degrees may be a lot of solar sky-time missed.
Remember that if a solar panel is partially shaded, most lose a significant portion of their power generating capability, well beyond the percent of the panel shaded.
If you do NOT track at all, a key selection is the angle of the panels. Are you going to align for maximum noontime collection for summer, winter, or the equinoxes? If you align for the noon equinoxes, noon at the summer and winter solstices will be off by 23.5 degrees (only receiving 92% of potential power). While someone with better math skills could calculate accurately, at a ballpark during the solstices when the sun is around 35 degrees east or west of the panel, you are only getting 50% or so of the available power. A significant aspect for the summer solstice is that the sun rises and sets North of an East/West line. Checking the Yuma Chart, for us optimistically it appears that the fixed panel would not even "see" the sun at due east until around 0840, and the sun would pass north of the panel at around 1520. (6 hours and 40 minutes exposure)
Broader, Mike Reynolds and his Earthship folks deal with other aspects of an “off the grid” home. http://www.earthship.com/
His three books have been available online at www.scribd.com
, or ask you local library about an interlibrary loan.
Youtube has several video’s of what appear to be recordings of class sessions he has presented.