A camping forum for VW bus and camper owners.
I've got a friend that has a 65w solar panel on the back end of his high top. He said on a good sunny weekend he can run a refrigerator, stereo and a few other devices for 4 days before his Aux battery dies. I'll see if he'll let me pass his contact info on to you.
I really appreciate your mention of the solar lanterns, I purchased two. As you wrote they work great!