Looked at this previously for large ground mounted solar sites as an alternative to arrays facing due south. Generation (for E-W compared to due south) per installed kWp is lower, but the attraction was that you can potentially increase installed capacity in a given area, as the arrays are installed back to back. Also gives potential to be generating more at peak demand in late afternoon/early evening to take advantage of higher grid export prices.
E-W smooths out the big midday peak you get with a south facing system.
The calculator here allows you to select your location, and input details on system size, roof slope etc. in order to estimate generation:
https://re.jrc.ec.europa.eu/pvg_tools/en/tools.html
I had a quick look at E-W for my location. Output was about 80% of a due south system.