Maggie & Jim,
Welcome to the Heartland Family & the best RV Forum on the Net !
Once you get used to moving about inside the forum, you will soon see the search tool. Do a Search on the site for additional postings about Solar. I bet you'll be surprised at the many different methods some have used to bring wires down from the Roof Level.
I too used the Fridge vent to run wires down... I attached a weather proof electrical box under the edge of the Fridge Vent Cover. From the 4 panels I have on the roof, I ran 2 separate wires to behind the side cover of the Fridge. From there, using a junction block... I connected those 2 sets of wires to a pair of much larger wires and those I ran to the Charge Controller which I located in the front compartment where the rest of the Solar System parts are located.
Good Luck with your project...