Where is the battery?
If it’s in a trailer pass -thru, you can install an SAE port in the Azdel sidewall just above the pass-thru door. If it’s on the tongue, you can still install a sidewall port, and then run the cable down to loom (and from there out to the battery box) where the other wires come into the battery disconnect, or install the port on the battery box. If you have a MH, you can install a port somewhere near the battery where you have an unobstructed wire run.
Next question is does the Solar Suitcase have a built-in charge solar charge controller?
If yes, then you can just wire the inside of the port to the battery with an inline fuse. If no, then you should install a charge controller as close to the battery as possible, and wire the wires inside the port to the inside charge controller. If this is the case, the wire from panel to charge controller does not need to be fused because it is low amperage. The wire from charge controller to battery should be fused; probably 15 amp fuse for a portable panel..
For more on inside battery with inside controller, see my photos on my albums. Ron, it’s always helpful if you describe your rig in your post or in your signature, so we know immediately the answers to these questions.
Jim. 2021b Micro Minnie 2108DS, 110w foldable solar
2021 GMC Canyon Denali 3.6L Gas 4x4, Husky C-Line
170AH LiFePo4, Xantrex XC2000, Champion 2500w df