im a bit worried about the " clean power " part. what happens if the power isnt clean and what could be the cause of that. how to avoid it .
The power coming out of your charge controller will be clean. The controller will be outputting to the batteries at optimum charging and to the DC out at 12VDC
If you can run the panels in series you could get a MPPT controller of the correct voltage/amp rating and get max power from those panels.
If you are running the panels to separate devices each panel will need its own controller.