Here's the Solar Collector, textured. There's an issue with the way I modeled the parabolic dish itself (darn boolean operations!) but I'm probably not going to bother fixing it, as I doubt it'll be seen farther away.
And with a studio lighting HDRI just to test the coloring on the secondary mirror:
Thank you both for the praise, I've never really modeled before (except for bouncing balls...) so I'm trying to be detailed even though I know this detail (such as the size/measurements stamped into the bolt heads, and individual optic fibers) will be lost in a larger scene and will complicate render times. I suppose I'm really just doing it trying to learn the ins and outs of modeling. And I now realize how frustrating using boolean operations can be. :|
Here's the electrolyzer. The UV map took the longest; it just did not want to work properly. :| But then again I've never used a UV map before and I have no clue what I'm doing. I still haven't gotten the bump map to work for the buttons.
Edit: Got the bump map working, and added a reflection map for the LED screen.