I bought a used 2018 ACE 27.2 that was solar ready. I ordered a 200W kit from Renogy that was on sale, under $500. It had a 30Amp PMW controller. The wires ran from the roof to under the bed, which were fairly obvious when opening the access door. I screwed on the panels on the roof (lots of real estate up there) and covered the screws with sealant. Connected the wires, and installed the controller on the side of the bed. It has a remote and a cell phone app to look at the functions. When I ordered the kit, I made sure there was enough wire to get to the batteries. The wire from the roof to under the bed is 10 AWG. I believe the wire I used to the battery was 8 Awg, possibly 6 Awg (whatever the tables said I needed). I then ran the larger wires to the batteries. You will need to buy a 30amp fuse to use on the hot side. I have only the factory batteries(2 group 27) and this set up charges them well. While off grid I can use a blender, TV, lights, etc. (I also installed a 3000 watt inverter). Has served me well.
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