If you have a solar panel from the factory, standard as in ‘07’s or optional as in ‘09’s, then you have a controller. They wouldn’t tout a new rig as having that sort of feature if it wasn’t complete and operational. On ours and many others, the controller is on the sidewall of the waste tank bay, behind essentially a handleless panel immediately in front of the curbside rear wheels. Many owners are not aware of that door panel, as it fastens underneath.
But my guess is since yours is similar, the controller is in near the inverter like Chuck’s. Ours is a cream colored box maybe 6”X6”X2”, perhaps bigger? It is a Heliotrope HPV-30D, similar to the image below. Chuck may say his is a different model. Heliotrope was a company near the Oregon coach factories. It has morphed into AM Solar:
https://amsolar.com/solar-panel-rv-companyIn addition, I believe we have a solar manual available for HPV-45D models in our Private BAC Members Only section, Coach Assist area.
Joel