I used 2" angle iron for my frames and they are similar size panels. We are off grid, so need all the powe we can get mid winter.
They are about 18 degrees (4/12 pitch roof) in the summer and 65 degrees in winter. We just add struts to tip them up.
It is worth it to me. They shed snow better standing up, and in summer the wind doesn't howl as bad through them being flat to the roof.
If you are grid tied, the difference won't be huge. The biggest thing will be snow shedding. I would even go steeper like almost 90 degrees for winter.