135 azimuth so SE because I didn't want to interfere farming on that field. I'm loosing some evening production for sure because of "wrong" backside tilt angle, but I calculated that I might be gaining more from front side because it's 700W and backside is only ~500W.
Here's a picture from close to perfect day last mid summer. This is from 1/4 of my array (=11kWp).
View attachment 196678
You can easily see why I'm now adding panels perpendicular to my current setup (shed roof/wall is ~230 azimuth). Their best performance should be around 16.00 (4pm). I bet the second hump would be little bigger but the first one even smaller if panels were totally vertical. Also I get that second hump only in summer so I loose something for maybe 4 months, but gain all year round because of current ~80 degree tilt.
So if you are going with three arrays (E,W,S) I'd tilt all those to ~80 degree. There are now new bifacials available that claim 90-95% bifaciality. That would mean you'd need only one totally vertical E/W array as both sides are almost identical production wise.