For me, the term "approximately optimize" doesn't make sense since:
Optimize - To make as perfect or effective as possible.
Approximately - Almost exact or correct
I can't quite think of the word that means "approximately optimizing"... unless do people think it's okay?
The context is as follows:
"The tool will approximately optimize the panels' positions by only selecting faces between 120-240 degrees orientation"
Edit: Thanks to FumbleFingers for helping clarify my understanding of the term "optimize". It seems that in computer programming it is possible for "partial" or "full" optimization. The original use of "approximately optimize" therefore is okay!